YQL-13794 remove most of boost & ICU dependency

ref:eae1a1c30940ed737c886518182fd97bd872667d

1 files changed, 0 insertions, 4757 deletions

diff --git a/contrib/libs/icu/include/unicode/unistr.h b/contrib/libs/icu/include/unicode/unistr.h
deleted file mode 100644
index da79053765..0000000000
--- a/contrib/libs/icu/include/unicode/unistr.h
+++ /dev/null
@@ -1,4757 +0,0 @@
-// © 2016 and later: Unicode, Inc. and others.
-// License & terms of use: http://www.unicode.org/copyright.html
-/*
-**********************************************************************
-*   Copyright (C) 1998-2016, International Business Machines
-*   Corporation and others.  All Rights Reserved.
-**********************************************************************
-*
-* File unistr.h
-*
-* Modification History:
-*
-*   Date        Name        Description
-*   09/25/98    stephen     Creation.
-*   11/11/98    stephen     Changed per 11/9 code review.
-*   04/20/99    stephen     Overhauled per 4/16 code review.
-*   11/18/99    aliu        Made to inherit from Replaceable.  Added method
-*                           handleReplaceBetween(); other methods unchanged.
-*   06/25/01    grhoten     Remove dependency on iostream.
-******************************************************************************
-*/
-
-#ifndef UNISTR_H
-#define UNISTR_H
-
-/**
- * \file
- * \brief C++ API: Unicode String
- */
-
-#include "unicode/utypes.h"
-
-#if U_SHOW_CPLUSPLUS_API
-
-#include <cstddef>
-#include "unicode/char16ptr.h"
-#include "unicode/rep.h"
-#include "unicode/std_string.h"
-#include "unicode/stringpiece.h"
-#include "unicode/bytestream.h"
-
-struct UConverter;          // unicode/ucnv.h
-
-#ifndef USTRING_H
-/**
- * \ingroup ustring_ustrlen
- */
-U_STABLE int32_t U_EXPORT2
-u_strlen(const UChar *s);
-#endif
-
-U_NAMESPACE_BEGIN
-
-#if !UCONFIG_NO_BREAK_ITERATION
-class BreakIterator;        // unicode/brkiter.h
-#endif
-class Edits;
-
-U_NAMESPACE_END
-
-// Not #ifndef U_HIDE_INTERNAL_API because UnicodeString needs the UStringCaseMapper.
-/**
- * Internal string case mapping function type.
- * All error checking must be done.
- * src and dest must not overlap.
- * @internal
- */
-typedef int32_t U_CALLCONV
-UStringCaseMapper(int32_t caseLocale, uint32_t options,
-#if !UCONFIG_NO_BREAK_ITERATION
-                  icu::BreakIterator *iter,
-#endif
-                  char16_t *dest, int32_t destCapacity,
-                  const char16_t *src, int32_t srcLength,
-                  icu::Edits *edits,
-                  UErrorCode &errorCode);
-
-U_NAMESPACE_BEGIN
-
-class Locale;               // unicode/locid.h
-class StringCharacterIterator;
-class UnicodeStringAppendable;  // unicode/appendable.h
-
-/* The <iostream> include has been moved to unicode/ustream.h */
-
-/**
- * Constant to be used in the UnicodeString(char *, int32_t, EInvariant) constructor
- * which constructs a Unicode string from an invariant-character char * string.
- * About invariant characters see utypes.h.
- * This constructor has no runtime dependency on conversion code and is
- * therefore recommended over ones taking a charset name string
- * (where the empty string "" indicates invariant-character conversion).
- *
- * @stable ICU 3.2
- */
-#define US_INV icu::UnicodeString::kInvariant
-
-/**
- * Unicode String literals in C++.
- *
- * Note: these macros are not recommended for new code.
- * Prior to the availability of C++11 and u"unicode string literals",
- * these macros were provided for portability and efficiency when
- * initializing UnicodeStrings from literals.
- *
- * They work only for strings that contain "invariant characters", i.e.,
- * only latin letters, digits, and some punctuation.
- * See utypes.h for details.
- *
- * The string parameter must be a C string literal.
- * The length of the string, not including the terminating
- * `NUL`, must be specified as a constant.
- * @stable ICU 2.0
- */
-#if !U_CHAR16_IS_TYPEDEF
-# define UNICODE_STRING(cs, _length) icu::UnicodeString(TRUE, u ## cs, _length)
-#else
-# define UNICODE_STRING(cs, _length) icu::UnicodeString(TRUE, (const char16_t*)u ## cs, _length)
-#endif
-
-/**
- * Unicode String literals in C++.
- * Dependent on the platform properties, different UnicodeString
- * constructors should be used to create a UnicodeString object from
- * a string literal.
- * The macros are defined for improved performance.
- * They work only for strings that contain "invariant characters", i.e.,
- * only latin letters, digits, and some punctuation.
- * See utypes.h for details.
- *
- * The string parameter must be a C string literal.
- * @stable ICU 2.0
- */
-#define UNICODE_STRING_SIMPLE(cs) UNICODE_STRING(cs, -1)
-
-/**
- * \def UNISTR_FROM_CHAR_EXPLICIT
- * This can be defined to be empty or "explicit".
- * If explicit, then the UnicodeString(char16_t) and UnicodeString(UChar32)
- * constructors are marked as explicit, preventing their inadvertent use.
- * @stable ICU 49
- */
-#ifndef UNISTR_FROM_CHAR_EXPLICIT
-# if defined(U_COMBINED_IMPLEMENTATION) || defined(U_COMMON_IMPLEMENTATION) || defined(U_I18N_IMPLEMENTATION) || defined(U_IO_IMPLEMENTATION)
-    // Auto-"explicit" in ICU library code.
-#   define UNISTR_FROM_CHAR_EXPLICIT explicit
-# else
-    // Empty by default for source code compatibility.
-#   define UNISTR_FROM_CHAR_EXPLICIT
-# endif
-#endif
-
-/**
- * \def UNISTR_FROM_STRING_EXPLICIT
- * This can be defined to be empty or "explicit".
- * If explicit, then the UnicodeString(const char *) and UnicodeString(const char16_t *)
- * constructors are marked as explicit, preventing their inadvertent use.
- *
- * In particular, this helps prevent accidentally depending on ICU conversion code
- * by passing a string literal into an API with a const UnicodeString & parameter.
- * @stable ICU 49
- */
-#ifndef UNISTR_FROM_STRING_EXPLICIT
-# if defined(U_COMBINED_IMPLEMENTATION) || defined(U_COMMON_IMPLEMENTATION) || defined(U_I18N_IMPLEMENTATION) || defined(U_IO_IMPLEMENTATION)
-    // Auto-"explicit" in ICU library code.
-#   define UNISTR_FROM_STRING_EXPLICIT explicit
-# else
-    // Empty by default for source code compatibility.
-#   define UNISTR_FROM_STRING_EXPLICIT
-# endif
-#endif
-
-/**
- * \def UNISTR_OBJECT_SIZE
- * Desired sizeof(UnicodeString) in bytes.
- * It should be a multiple of sizeof(pointer) to avoid unusable space for padding.
- * The object size may want to be a multiple of 16 bytes,
- * which is a common granularity for heap allocation.
- *
- * Any space inside the object beyond sizeof(vtable pointer) + 2
- * is available for storing short strings inside the object.
- * The bigger the object, the longer a string that can be stored inside the object,
- * without additional heap allocation.
- *
- * Depending on a platform's pointer size, pointer alignment requirements,
- * and struct padding, the compiler will usually round up sizeof(UnicodeString)
- * to 4 * sizeof(pointer) (or 3 * sizeof(pointer) for P128 data models),
- * to hold the fields for heap-allocated strings.
- * Such a minimum size also ensures that the object is easily large enough
- * to hold at least 2 char16_ts, for one supplementary code point (U16_MAX_LENGTH).
- *
- * sizeof(UnicodeString) >= 48 should work for all known platforms.
- *
- * For example, on a 64-bit machine where sizeof(vtable pointer) is 8,
- * sizeof(UnicodeString) = 64 would leave space for
- * (64 - sizeof(vtable pointer) - 2) / U_SIZEOF_UCHAR = (64 - 8 - 2) / 2 = 27
- * char16_ts stored inside the object.
- *
- * The minimum object size on a 64-bit machine would be
- * 4 * sizeof(pointer) = 4 * 8 = 32 bytes,
- * and the internal buffer would hold up to 11 char16_ts in that case.
- *
- * @see U16_MAX_LENGTH
- * @stable ICU 56
- */
-#ifndef UNISTR_OBJECT_SIZE
-# define UNISTR_OBJECT_SIZE 64
-#endif
-
-/**
- * UnicodeString is a string class that stores Unicode characters directly and provides
- * similar functionality as the Java String and StringBuffer/StringBuilder classes.
- * It is a concrete implementation of the abstract class Replaceable (for transliteration).
- *
- * The UnicodeString equivalent of std::string’s clear() is remove().
- *
- * A UnicodeString may "alias" an external array of characters
- * (that is, point to it, rather than own the array)
- * whose lifetime must then at least match the lifetime of the aliasing object.
- * This aliasing may be preserved when returning a UnicodeString by value,
- * depending on the compiler and the function implementation,
- * via Return Value Optimization (RVO) or the move assignment operator.
- * (However, the copy assignment operator does not preserve aliasing.)
- * For details see the description of storage models at the end of the class API docs
- * and in the User Guide chapter linked from there.
- *
- * The UnicodeString class is not suitable for subclassing.
- *
- * For an overview of Unicode strings in C and C++ see the
- * [User Guide Strings chapter](http://userguide.icu-project.org/strings#TOC-Strings-in-C-C-).
- *
- * In ICU, a Unicode string consists of 16-bit Unicode *code units*.
- * A Unicode character may be stored with either one code unit
- * (the most common case) or with a matched pair of special code units
- * ("surrogates"). The data type for code units is char16_t.
- * For single-character handling, a Unicode character code *point* is a value
- * in the range 0..0x10ffff. ICU uses the UChar32 type for code points.
- *
- * Indexes and offsets into and lengths of strings always count code units, not code points.
- * This is the same as with multi-byte char* strings in traditional string handling.
- * Operations on partial strings typically do not test for code point boundaries.
- * If necessary, the user needs to take care of such boundaries by testing for the code unit
- * values or by using functions like
- * UnicodeString::getChar32Start() and UnicodeString::getChar32Limit()
- * (or, in C, the equivalent macros U16_SET_CP_START() and U16_SET_CP_LIMIT(), see utf.h).
- *
- * UnicodeString methods are more lenient with regard to input parameter values
- * than other ICU APIs. In particular:
- * - If indexes are out of bounds for a UnicodeString object
- *   (< 0 or > length()) then they are "pinned" to the nearest boundary.
- * - If the buffer passed to an insert/append/replace operation is owned by the
- *   target object, e.g., calling str.append(str), an extra copy may take place
- *   to ensure safety.
- * - If primitive string pointer values (e.g., const char16_t * or char *)
- *   for input strings are NULL, then those input string parameters are treated
- *   as if they pointed to an empty string.
- *   However, this is *not* the case for char * parameters for charset names
- *   or other IDs.
- * - Most UnicodeString methods do not take a UErrorCode parameter because
- *   there are usually very few opportunities for failure other than a shortage
- *   of memory, error codes in low-level C++ string methods would be inconvenient,
- *   and the error code as the last parameter (ICU convention) would prevent
- *   the use of default parameter values.
- *   Instead, such methods set the UnicodeString into a "bogus" state
- *   (see isBogus()) if an error occurs.
- *
- * In string comparisons, two UnicodeString objects that are both "bogus"
- * compare equal (to be transitive and prevent endless loops in sorting),
- * and a "bogus" string compares less than any non-"bogus" one.
- *
- * Const UnicodeString methods are thread-safe. Multiple threads can use
- * const methods on the same UnicodeString object simultaneously,
- * but non-const methods must not be called concurrently (in multiple threads)
- * with any other (const or non-const) methods.
- *
- * Similarly, const UnicodeString & parameters are thread-safe.
- * One object may be passed in as such a parameter concurrently in multiple threads.
- * This includes the const UnicodeString & parameters for
- * copy construction, assignment, and cloning.
- *
- * UnicodeString uses several storage methods.
- * String contents can be stored inside the UnicodeString object itself,
- * in an allocated and shared buffer, or in an outside buffer that is "aliased".
- * Most of this is done transparently, but careful aliasing in particular provides
- * significant performance improvements.
- * Also, the internal buffer is accessible via special functions.
- * For details see the
- * [User Guide Strings chapter](http://userguide.icu-project.org/strings#TOC-Maximizing-Performance-with-the-UnicodeString-Storage-Model).
- *
- * @see utf.h
- * @see CharacterIterator
- * @stable ICU 2.0
- */
-class U_COMMON_API UnicodeString : public Replaceable
-{
-public:
-
-  /**
-   * Constant to be used in the UnicodeString(char *, int32_t, EInvariant) constructor
-   * which constructs a Unicode string from an invariant-character char * string.
-   * Use the macro US_INV instead of the full qualification for this value.
-   *
-   * @see US_INV
-   * @stable ICU 3.2
-   */
-  enum EInvariant {
-    /**
-     * @see EInvariant
-     * @stable ICU 3.2
-     */
-    kInvariant
-  };
-
-  //========================================
-  // Read-only operations
-  //========================================
-
-  /* Comparison - bitwise only - for international comparison use collation */
-
-  /**
-   * Equality operator. Performs only bitwise comparison.
-   * @param text The UnicodeString to compare to this one.
-   * @return TRUE if `text` contains the same characters as this one,
-   * FALSE otherwise.
-   * @stable ICU 2.0
-   */
-  inline UBool operator== (const UnicodeString& text) const;
-
-  /**
-   * Inequality operator. Performs only bitwise comparison.
-   * @param text The UnicodeString to compare to this one.
-   * @return FALSE if `text` contains the same characters as this one,
-   * TRUE otherwise.
-   * @stable ICU 2.0
-   */
-  inline UBool operator!= (const UnicodeString& text) const;
-
-  /**
-   * Greater than operator. Performs only bitwise comparison.
-   * @param text The UnicodeString to compare to this one.
-   * @return TRUE if the characters in this are bitwise
-   * greater than the characters in `text`, FALSE otherwise
-   * @stable ICU 2.0
-   */
-  inline UBool operator> (const UnicodeString& text) const;
-
-  /**
-   * Less than operator. Performs only bitwise comparison.
-   * @param text The UnicodeString to compare to this one.
-   * @return TRUE if the characters in this are bitwise
-   * less than the characters in `text`, FALSE otherwise
-   * @stable ICU 2.0
-   */
-  inline UBool operator< (const UnicodeString& text) const;
-
-  /**
-   * Greater than or equal operator. Performs only bitwise comparison.
-   * @param text The UnicodeString to compare to this one.
-   * @return TRUE if the characters in this are bitwise
-   * greater than or equal to the characters in `text`, FALSE otherwise
-   * @stable ICU 2.0
-   */
-  inline UBool operator>= (const UnicodeString& text) const;
-
-  /**
-   * Less than or equal operator. Performs only bitwise comparison.
-   * @param text The UnicodeString to compare to this one.
-   * @return TRUE if the characters in this are bitwise
-   * less than or equal to the characters in `text`, FALSE otherwise
-   * @stable ICU 2.0
-   */
-  inline UBool operator<= (const UnicodeString& text) const;
-
-  /**
-   * Compare the characters bitwise in this UnicodeString to
-   * the characters in `text`.
-   * @param text The UnicodeString to compare to this one.
-   * @return The result of bitwise character comparison: 0 if this
-   * contains the same characters as `text`, -1 if the characters in
-   * this are bitwise less than the characters in `text`, +1 if the
-   * characters in this are bitwise greater than the characters
-   * in `text`.
-   * @stable ICU 2.0
-   */
-  inline int8_t compare(const UnicodeString& text) const;
-
-  /**
-   * Compare the characters bitwise in the range
-   * [`start`, `start + length`) with the characters
-   * in the **entire string** `text`.
-   * (The parameters "start" and "length" are not applied to the other text "text".)
-   * @param start the offset at which the compare operation begins
-   * @param length the number of characters of text to compare.
-   * @param text the other text to be compared against this string.
-   * @return The result of bitwise character comparison: 0 if this
-   * contains the same characters as `text`, -1 if the characters in
-   * this are bitwise less than the characters in `text`, +1 if the
-   * characters in this are bitwise greater than the characters
-   * in `text`.
-   * @stable ICU 2.0
-   */
-  inline int8_t compare(int32_t start,
-         int32_t length,
-         const UnicodeString& text) const;
-
-  /**
-   * Compare the characters bitwise in the range
-   * [`start`, `start + length`) with the characters
-   * in `srcText` in the range
-   * [`srcStart`, `srcStart + srcLength`).
-   * @param start the offset at which the compare operation begins
-   * @param length the number of characters in this to compare.
-   * @param srcText the text to be compared
-   * @param srcStart the offset into `srcText` to start comparison
-   * @param srcLength the number of characters in `src` to compare
-   * @return The result of bitwise character comparison: 0 if this
-   * contains the same characters as `srcText`, -1 if the characters in
-   * this are bitwise less than the characters in `srcText`, +1 if the
-   * characters in this are bitwise greater than the characters
-   * in `srcText`.
-   * @stable ICU 2.0
-   */
-   inline int8_t compare(int32_t start,
-         int32_t length,
-         const UnicodeString& srcText,
-         int32_t srcStart,
-         int32_t srcLength) const;
-
-  /**
-   * Compare the characters bitwise in this UnicodeString with the first
-   * `srcLength` characters in `srcChars`.
-   * @param srcChars The characters to compare to this UnicodeString.
-   * @param srcLength the number of characters in `srcChars` to compare
-   * @return The result of bitwise character comparison: 0 if this
-   * contains the same characters as `srcChars`, -1 if the characters in
-   * this are bitwise less than the characters in `srcChars`, +1 if the
-   * characters in this are bitwise greater than the characters
-   * in `srcChars`.
-   * @stable ICU 2.0
-   */
-  inline int8_t compare(ConstChar16Ptr srcChars,
-         int32_t srcLength) const;
-
-  /**
-   * Compare the characters bitwise in the range
-   * [`start`, `start + length`) with the first
-   * `length` characters in `srcChars`
-   * @param start the offset at which the compare operation begins
-   * @param length the number of characters to compare.
-   * @param srcChars the characters to be compared
-   * @return The result of bitwise character comparison: 0 if this
-   * contains the same characters as `srcChars`, -1 if the characters in
-   * this are bitwise less than the characters in `srcChars`, +1 if the
-   * characters in this are bitwise greater than the characters
-   * in `srcChars`.
-   * @stable ICU 2.0
-   */
-  inline int8_t compare(int32_t start,
-         int32_t length,
-         const char16_t *srcChars) const;
-
-  /**
-   * Compare the characters bitwise in the range
-   * [`start`, `start + length`) with the characters
-   * in `srcChars` in the range
-   * [`srcStart`, `srcStart + srcLength`).
-   * @param start the offset at which the compare operation begins
-   * @param length the number of characters in this to compare
-   * @param srcChars the characters to be compared
-   * @param srcStart the offset into `srcChars` to start comparison
-   * @param srcLength the number of characters in `srcChars` to compare
-   * @return The result of bitwise character comparison: 0 if this
-   * contains the same characters as `srcChars`, -1 if the characters in
-   * this are bitwise less than the characters in `srcChars`, +1 if the
-   * characters in this are bitwise greater than the characters
-   * in `srcChars`.
-   * @stable ICU 2.0
-   */
-  inline int8_t compare(int32_t start,
-         int32_t length,
-         const char16_t *srcChars,
-         int32_t srcStart,
-         int32_t srcLength) const;
-
-  /**
-   * Compare the characters bitwise in the range
-   * [`start`, `limit`) with the characters
-   * in `srcText` in the range
-   * [`srcStart`, `srcLimit`).
-   * @param start the offset at which the compare operation begins
-   * @param limit the offset immediately following the compare operation
-   * @param srcText the text to be compared
-   * @param srcStart the offset into `srcText` to start comparison
-   * @param srcLimit the offset into `srcText` to limit comparison
-   * @return The result of bitwise character comparison: 0 if this
-   * contains the same characters as `srcText`, -1 if the characters in
-   * this are bitwise less than the characters in `srcText`, +1 if the
-   * characters in this are bitwise greater than the characters
-   * in `srcText`.
-   * @stable ICU 2.0
-   */
-  inline int8_t compareBetween(int32_t start,
-            int32_t limit,
-            const UnicodeString& srcText,
-            int32_t srcStart,
-            int32_t srcLimit) const;
-
-  /**
-   * Compare two Unicode strings in code point order.
-   * The result may be different from the results of compare(), operator<, etc.
-   * if supplementary characters are present:
-   *
-   * In UTF-16, supplementary characters (with code points U+10000 and above) are
-   * stored with pairs of surrogate code units. These have values from 0xd800 to 0xdfff,
-   * which means that they compare as less than some other BMP characters like U+feff.
-   * This function compares Unicode strings in code point order.
-   * If either of the UTF-16 strings is malformed (i.e., it contains unpaired surrogates), then the result is not defined.
-   *
-   * @param text Another string to compare this one to.
-   * @return a negative/zero/positive integer corresponding to whether
-   * this string is less than/equal to/greater than the second one
-   * in code point order
-   * @stable ICU 2.0
-   */
-  inline int8_t compareCodePointOrder(const UnicodeString& text) const;
-
-  /**
-   * Compare two Unicode strings in code point order.
-   * The result may be different from the results of compare(), operator<, etc.
-   * if supplementary characters are present:
-   *
-   * In UTF-16, supplementary characters (with code points U+10000 and above) are
-   * stored with pairs of surrogate code units. These have values from 0xd800 to 0xdfff,
-   * which means that they compare as less than some other BMP characters like U+feff.
-   * This function compares Unicode strings in code point order.
-   * If either of the UTF-16 strings is malformed (i.e., it contains unpaired surrogates), then the result is not defined.
-   *
-   * @param start The start offset in this string at which the compare operation begins.
-   * @param length The number of code units from this string to compare.
-   * @param srcText Another string to compare this one to.
-   * @return a negative/zero/positive integer corresponding to whether
-   * this string is less than/equal to/greater than the second one
-   * in code point order
-   * @stable ICU 2.0
-   */
-  inline int8_t compareCodePointOrder(int32_t start,
-                                      int32_t length,
-                                      const UnicodeString& srcText) const;
-
-  /**
-   * Compare two Unicode strings in code point order.
-   * The result may be different from the results of compare(), operator<, etc.
-   * if supplementary characters are present:
-   *
-   * In UTF-16, supplementary characters (with code points U+10000 and above) are
-   * stored with pairs of surrogate code units. These have values from 0xd800 to 0xdfff,
-   * which means that they compare as less than some other BMP characters like U+feff.
-   * This function compares Unicode strings in code point order.
-   * If either of the UTF-16 strings is malformed (i.e., it contains unpaired surrogates), then the result is not defined.
-   *
-   * @param start The start offset in this string at which the compare operation begins.
-   * @param length The number of code units from this string to compare.
-   * @param srcText Another string to compare this one to.
-   * @param srcStart The start offset in that string at which the compare operation begins.
-   * @param srcLength The number of code units from that string to compare.
-   * @return a negative/zero/positive integer corresponding to whether
-   * this string is less than/equal to/greater than the second one
-   * in code point order
-   * @stable ICU 2.0
-   */
-   inline int8_t compareCodePointOrder(int32_t start,
-                                       int32_t length,
-                                       const UnicodeString& srcText,
-                                       int32_t srcStart,
-                                       int32_t srcLength) const;
-
-  /**
-   * Compare two Unicode strings in code point order.
-   * The result may be different from the results of compare(), operator<, etc.
-   * if supplementary characters are present:
-   *
-   * In UTF-16, supplementary characters (with code points U+10000 and above) are
-   * stored with pairs of surrogate code units. These have values from 0xd800 to 0xdfff,
-   * which means that they compare as less than some other BMP characters like U+feff.
-   * This function compares Unicode strings in code point order.
-   * If either of the UTF-16 strings is malformed (i.e., it contains unpaired surrogates), then the result is not defined.
-   *
-   * @param srcChars A pointer to another string to compare this one to.
-   * @param srcLength The number of code units from that string to compare.
-   * @return a negative/zero/positive integer corresponding to whether
-   * this string is less than/equal to/greater than the second one
-   * in code point order
-   * @stable ICU 2.0
-   */
-  inline int8_t compareCodePointOrder(ConstChar16Ptr srcChars,
-                                      int32_t srcLength) const;
-
-  /**
-   * Compare two Unicode strings in code point order.
-   * The result may be different from the results of compare(), operator<, etc.
-   * if supplementary characters are present:
-   *
-   * In UTF-16, supplementary characters (with code points U+10000 and above) are
-   * stored with pairs of surrogate code units. These have values from 0xd800 to 0xdfff,
-   * which means that they compare as less than some other BMP characters like U+feff.
-   * This function compares Unicode strings in code point order.
-   * If either of the UTF-16 strings is malformed (i.e., it contains unpaired surrogates), then the result is not defined.
-   *
-   * @param start The start offset in this string at which the compare operation begins.
-   * @param length The number of code units from this string to compare.
-   * @param srcChars A pointer to another string to compare this one to.
-   * @return a negative/zero/positive integer corresponding to whether
-   * this string is less than/equal to/greater than the second one
-   * in code point order
-   * @stable ICU 2.0
-   */
-  inline int8_t compareCodePointOrder(int32_t start,
-                                      int32_t length,
-                                      const char16_t *srcChars) const;
-
-  /**
-   * Compare two Unicode strings in code point order.
-   * The result may be different from the results of compare(), operator<, etc.
-   * if supplementary characters are present:
-   *
-   * In UTF-16, supplementary characters (with code points U+10000 and above) are
-   * stored with pairs of surrogate code units. These have values from 0xd800 to 0xdfff,
-   * which means that they compare as less than some other BMP characters like U+feff.
-   * This function compares Unicode strings in code point order.
-   * If either of the UTF-16 strings is malformed (i.e., it contains unpaired surrogates), then the result is not defined.
-   *
-   * @param start The start offset in this string at which the compare operation begins.
-   * @param length The number of code units from this string to compare.
-   * @param srcChars A pointer to another string to compare this one to.
-   * @param srcStart The start offset in that string at which the compare operation begins.
-   * @param srcLength The number of code units from that string to compare.
-   * @return a negative/zero/positive integer corresponding to whether
-   * this string is less than/equal to/greater than the second one
-   * in code point order
-   * @stable ICU 2.0
-   */
-  inline int8_t compareCodePointOrder(int32_t start,
-                                      int32_t length,
-                                      const char16_t *srcChars,
-                                      int32_t srcStart,
-                                      int32_t srcLength) const;
-
-  /**
-   * Compare two Unicode strings in code point order.
-   * The result may be different from the results of compare(), operator<, etc.
-   * if supplementary characters are present:
-   *
-   * In UTF-16, supplementary characters (with code points U+10000 and above) are
-   * stored with pairs of surrogate code units. These have values from 0xd800 to 0xdfff,
-   * which means that they compare as less than some other BMP characters like U+feff.
-   * This function compares Unicode strings in code point order.
-   * If either of the UTF-16 strings is malformed (i.e., it contains unpaired surrogates), then the result is not defined.
-   *
-   * @param start The start offset in this string at which the compare operation begins.
-   * @param limit The offset after the last code unit from this string to compare.
-   * @param srcText Another string to compare this one to.
-   * @param srcStart The start offset in that string at which the compare operation begins.
-   * @param srcLimit The offset after the last code unit from that string to compare.
-   * @return a negative/zero/positive integer corresponding to whether
-   * this string is less than/equal to/greater than the second one
-   * in code point order
-   * @stable ICU 2.0
-   */
-  inline int8_t compareCodePointOrderBetween(int32_t start,
-                                             int32_t limit,
-                                             const UnicodeString& srcText,
-                                             int32_t srcStart,
-                                             int32_t srcLimit) const;
-
-  /**
-   * Compare two strings case-insensitively using full case folding.
-   * This is equivalent to this->foldCase(options).compare(text.foldCase(options)).
-   *
-   * @param text Another string to compare this one to.
-   * @param options A bit set of options:
-   *   - U_FOLD_CASE_DEFAULT or 0 is used for default options:
-   *     Comparison in code unit order with default case folding.
-   *
-   *   - U_COMPARE_CODE_POINT_ORDER
-   *     Set to choose code point order instead of code unit order
-   *     (see u_strCompare for details).
-   *
-   *   - U_FOLD_CASE_EXCLUDE_SPECIAL_I
-   *
-   * @return A negative, zero, or positive integer indicating the comparison result.
-   * @stable ICU 2.0
-   */
-  inline int8_t caseCompare(const UnicodeString& text, uint32_t options) const;
-
-  /**
-   * Compare two strings case-insensitively using full case folding.
-   * This is equivalent to this->foldCase(options).compare(srcText.foldCase(options)).
-   *
-   * @param start The start offset in this string at which the compare operation begins.
-   * @param length The number of code units from this string to compare.
-   * @param srcText Another string to compare this one to.
-   * @param options A bit set of options:
-   *   - U_FOLD_CASE_DEFAULT or 0 is used for default options:
-   *     Comparison in code unit order with default case folding.
-   *
-   *   - U_COMPARE_CODE_POINT_ORDER
-   *     Set to choose code point order instead of code unit order
-   *     (see u_strCompare for details).
-   *
-   *   - U_FOLD_CASE_EXCLUDE_SPECIAL_I
-   *
-   * @return A negative, zero, or positive integer indicating the comparison result.
-   * @stable ICU 2.0
-   */
-  inline int8_t caseCompare(int32_t start,
-         int32_t length,
-         const UnicodeString& srcText,
-         uint32_t options) const;
-
-  /**
-   * Compare two strings case-insensitively using full case folding.
-   * This is equivalent to this->foldCase(options).compare(srcText.foldCase(options)).
-   *
-   * @param start The start offset in this string at which the compare operation begins.
-   * @param length The number of code units from this string to compare.
-   * @param srcText Another string to compare this one to.
-   * @param srcStart The start offset in that string at which the compare operation begins.
-   * @param srcLength The number of code units from that string to compare.
-   * @param options A bit set of options:
-   *   - U_FOLD_CASE_DEFAULT or 0 is used for default options:
-   *     Comparison in code unit order with default case folding.
-   *
-   *   - U_COMPARE_CODE_POINT_ORDER
-   *     Set to choose code point order instead of code unit order
-   *     (see u_strCompare for details).
-   *
-   *   - U_FOLD_CASE_EXCLUDE_SPECIAL_I
-   *
-   * @return A negative, zero, or positive integer indicating the comparison result.
-   * @stable ICU 2.0
-   */
-  inline int8_t caseCompare(int32_t start,
-         int32_t length,
-         const UnicodeString& srcText,
-         int32_t srcStart,
-         int32_t srcLength,
-         uint32_t options) const;
-
-  /**
-   * Compare two strings case-insensitively using full case folding.
-   * This is equivalent to this->foldCase(options).compare(srcChars.foldCase(options)).
-   *
-   * @param srcChars A pointer to another string to compare this one to.
-   * @param srcLength The number of code units from that string to compare.
-   * @param options A bit set of options:
-   *   - U_FOLD_CASE_DEFAULT or 0 is used for default options:
-   *     Comparison in code unit order with default case folding.
-   *
-   *   - U_COMPARE_CODE_POINT_ORDER
-   *     Set to choose code point order instead of code unit order
-   *     (see u_strCompare for details).
-   *
-   *   - U_FOLD_CASE_EXCLUDE_SPECIAL_I
-   *
-   * @return A negative, zero, or positive integer indicating the comparison result.
-   * @stable ICU 2.0
-   */
-  inline int8_t caseCompare(ConstChar16Ptr srcChars,
-         int32_t srcLength,
-         uint32_t options) const;
-
-  /**
-   * Compare two strings case-insensitively using full case folding.
-   * This is equivalent to this->foldCase(options).compare(srcChars.foldCase(options)).
-   *
-   * @param start The start offset in this string at which the compare operation begins.
-   * @param length The number of code units from this string to compare.
-   * @param srcChars A pointer to another string to compare this one to.
-   * @param options A bit set of options:
-   *   - U_FOLD_CASE_DEFAULT or 0 is used for default options:
-   *     Comparison in code unit order with default case folding.
-   *
-   *   - U_COMPARE_CODE_POINT_ORDER
-   *     Set to choose code point order instead of code unit order
-   *     (see u_strCompare for details).
-   *
-   *   - U_FOLD_CASE_EXCLUDE_SPECIAL_I
-   *
-   * @return A negative, zero, or positive integer indicating the comparison result.
-   * @stable ICU 2.0
-   */
-  inline int8_t caseCompare(int32_t start,
-         int32_t length,
-         const char16_t *srcChars,
-         uint32_t options) const;
-
-  /**
-   * Compare two strings case-insensitively using full case folding.
-   * This is equivalent to this->foldCase(options).compare(srcChars.foldCase(options)).
-   *
-   * @param start The start offset in this string at which the compare operation begins.
-   * @param length The number of code units from this string to compare.
-   * @param srcChars A pointer to another string to compare this one to.
-   * @param srcStart The start offset in that string at which the compare operation begins.
-   * @param srcLength The number of code units from that string to compare.
-   * @param options A bit set of options:
-   *   - U_FOLD_CASE_DEFAULT or 0 is used for default options:
-   *     Comparison in code unit order with default case folding.
-   *
-   *   - U_COMPARE_CODE_POINT_ORDER
-   *     Set to choose code point order instead of code unit order
-   *     (see u_strCompare for details).
-   *
-   *   - U_FOLD_CASE_EXCLUDE_SPECIAL_I
-   *
-   * @return A negative, zero, or positive integer indicating the comparison result.
-   * @stable ICU 2.0
-   */
-  inline int8_t caseCompare(int32_t start,
-         int32_t length,
-         const char16_t *srcChars,
-         int32_t srcStart,
-         int32_t srcLength,
-         uint32_t options) const;
-
-  /**
-   * Compare two strings case-insensitively using full case folding.
-   * This is equivalent to this->foldCase(options).compareBetween(text.foldCase(options)).
-   *
-   * @param start The start offset in this string at which the compare operation begins.
-   * @param limit The offset after the last code unit from this string to compare.
-   * @param srcText Another string to compare this one to.
-   * @param srcStart The start offset in that string at which the compare operation begins.
-   * @param srcLimit The offset after the last code unit from that string to compare.
-   * @param options A bit set of options:
-   *   - U_FOLD_CASE_DEFAULT or 0 is used for default options:
-   *     Comparison in code unit order with default case folding.
-   *
-   *   - U_COMPARE_CODE_POINT_ORDER
-   *     Set to choose code point order instead of code unit order
-   *     (see u_strCompare for details).
-   *
-   *   - U_FOLD_CASE_EXCLUDE_SPECIAL_I
-   *
-   * @return A negative, zero, or positive integer indicating the comparison result.
-   * @stable ICU 2.0
-   */
-  inline int8_t caseCompareBetween(int32_t start,
-            int32_t limit,
-            const UnicodeString& srcText,
-            int32_t srcStart,
-            int32_t srcLimit,
-            uint32_t options) const;
-
-  /**
-   * Determine if this starts with the characters in `text`
-   * @param text The text to match.
-   * @return TRUE if this starts with the characters in `text`,
-   * FALSE otherwise
-   * @stable ICU 2.0
-   */
-  inline UBool startsWith(const UnicodeString& text) const;
-
-  /**
-   * Determine if this starts with the characters in `srcText`
-   * in the range [`srcStart`, `srcStart + srcLength`).
-   * @param srcText The text to match.
-   * @param srcStart the offset into `srcText` to start matching
-   * @param srcLength the number of characters in `srcText` to match
-   * @return TRUE if this starts with the characters in `text`,
-   * FALSE otherwise
-   * @stable ICU 2.0
-   */
-  inline UBool startsWith(const UnicodeString& srcText,
-            int32_t srcStart,
-            int32_t srcLength) const;
-
-  /**
-   * Determine if this starts with the characters in `srcChars`
-   * @param srcChars The characters to match.
-   * @param srcLength the number of characters in `srcChars`
-   * @return TRUE if this starts with the characters in `srcChars`,
-   * FALSE otherwise
-   * @stable ICU 2.0
-   */
-  inline UBool startsWith(ConstChar16Ptr srcChars,
-            int32_t srcLength) const;
-
-  /**
-   * Determine if this ends with the characters in `srcChars`
-   * in the range  [`srcStart`, `srcStart + srcLength`).
-   * @param srcChars The characters to match.
-   * @param srcStart the offset into `srcText` to start matching
-   * @param srcLength the number of characters in `srcChars` to match
-   * @return TRUE if this ends with the characters in `srcChars`, FALSE otherwise
-   * @stable ICU 2.0
-   */
-  inline UBool startsWith(const char16_t *srcChars,
-            int32_t srcStart,
-            int32_t srcLength) const;
-
-  /**
-   * Determine if this ends with the characters in `text`
-   * @param text The text to match.
-   * @return TRUE if this ends with the characters in `text`,
-   * FALSE otherwise
-   * @stable ICU 2.0
-   */
-  inline UBool endsWith(const UnicodeString& text) const;
-
-  /**
-   * Determine if this ends with the characters in `srcText`
-   * in the range [`srcStart`, `srcStart + srcLength`).
-   * @param srcText The text to match.
-   * @param srcStart the offset into `srcText` to start matching
-   * @param srcLength the number of characters in `srcText` to match
-   * @return TRUE if this ends with the characters in `text`,
-   * FALSE otherwise
-   * @stable ICU 2.0
-   */
-  inline UBool endsWith(const UnicodeString& srcText,
-          int32_t srcStart,
-          int32_t srcLength) const;
-
-  /**
-   * Determine if this ends with the characters in `srcChars`
-   * @param srcChars The characters to match.
-   * @param srcLength the number of characters in `srcChars`
-   * @return TRUE if this ends with the characters in `srcChars`,
-   * FALSE otherwise
-   * @stable ICU 2.0
-   */
-  inline UBool endsWith(ConstChar16Ptr srcChars,
-          int32_t srcLength) const;
-
-  /**
-   * Determine if this ends with the characters in `srcChars`
-   * in the range  [`srcStart`, `srcStart + srcLength`).
-   * @param srcChars The characters to match.
-   * @param srcStart the offset into `srcText` to start matching
-   * @param srcLength the number of characters in `srcChars` to match
-   * @return TRUE if this ends with the characters in `srcChars`,
-   * FALSE otherwise
-   * @stable ICU 2.0
-   */
-  inline UBool endsWith(const char16_t *srcChars,
-          int32_t srcStart,
-          int32_t srcLength) const;
-
-
-  /* Searching - bitwise only */
-
-  /**
-   * Locate in this the first occurrence of the characters in `text`,
-   * using bitwise comparison.
-   * @param text The text to search for.
-   * @return The offset into this of the start of `text`,
-   * or -1 if not found.
-   * @stable ICU 2.0
-   */
-  inline int32_t indexOf(const UnicodeString& text) const;
-
-  /**
-   * Locate in this the first occurrence of the characters in `text`
-   * starting at offset `start`, using bitwise comparison.
-   * @param text The text to search for.
-   * @param start The offset at which searching will start.
-   * @return The offset into this of the start of `text`,
-   * or -1 if not found.
-   * @stable ICU 2.0
-   */
-  inline int32_t indexOf(const UnicodeString& text,
-              int32_t start) const;
-
-  /**
-   * Locate in this the first occurrence in the range
-   * [`start`, `start + length`) of the characters
-   * in `text`, using bitwise comparison.
-   * @param text The text to search for.
-   * @param start The offset at which searching will start.
-   * @param length The number of characters to search
-   * @return The offset into this of the start of `text`,
-   * or -1 if not found.
-   * @stable ICU 2.0
-   */
-  inline int32_t indexOf(const UnicodeString& text,
-              int32_t start,
-              int32_t length) const;
-
-  /**
-   * Locate in this the first occurrence in the range
-   * [`start`, `start + length`) of the characters
-   *  in `srcText` in the range
-   * [`srcStart`, `srcStart + srcLength`),
-   * using bitwise comparison.
-   * @param srcText The text to search for.
-   * @param srcStart the offset into `srcText` at which
-   * to start matching
-   * @param srcLength the number of characters in `srcText` to match
-   * @param start the offset into this at which to start matching
-   * @param length the number of characters in this to search
-   * @return The offset into this of the start of `text`,
-   * or -1 if not found.
-   * @stable ICU 2.0
-   */
-  inline int32_t indexOf(const UnicodeString& srcText,
-              int32_t srcStart,
-              int32_t srcLength,
-              int32_t start,
-              int32_t length) const;
-
-  /**
-   * Locate in this the first occurrence of the characters in
-   * `srcChars`
-   * starting at offset `start`, using bitwise comparison.
-   * @param srcChars The text to search for.
-   * @param srcLength the number of characters in `srcChars` to match
-   * @param start the offset into this at which to start matching
-   * @return The offset into this of the start of `text`,
-   * or -1 if not found.
-   * @stable ICU 2.0
-   */
-  inline int32_t indexOf(const char16_t *srcChars,
-              int32_t srcLength,
-              int32_t start) const;
-
-  /**
-   * Locate in this the first occurrence in the range
-   * [`start`, `start + length`) of the characters
-   * in `srcChars`, using bitwise comparison.
-   * @param srcChars The text to search for.
-   * @param srcLength the number of characters in `srcChars`
-   * @param start The offset at which searching will start.
-   * @param length The number of characters to search
-   * @return The offset into this of the start of `srcChars`,
-   * or -1 if not found.
-   * @stable ICU 2.0
-   */
-  inline int32_t indexOf(ConstChar16Ptr srcChars,
-              int32_t srcLength,
-              int32_t start,
-              int32_t length) const;
-
-  /**
-   * Locate in this the first occurrence in the range
-   * [`start`, `start + length`) of the characters
-   * in `srcChars` in the range
-   * [`srcStart`, `srcStart + srcLength`),
-   * using bitwise comparison.
-   * @param srcChars The text to search for.
-   * @param srcStart the offset into `srcChars` at which
-   * to start matching
-   * @param srcLength the number of characters in `srcChars` to match
-   * @param start the offset into this at which to start matching
-   * @param length the number of characters in this to search
-   * @return The offset into this of the start of `text`,
-   * or -1 if not found.
-   * @stable ICU 2.0
-   */
-  int32_t indexOf(const char16_t *srcChars,
-              int32_t srcStart,
-              int32_t srcLength,
-              int32_t start,
-              int32_t length) const;
-
-  /**
-   * Locate in this the first occurrence of the BMP code point `c`,
-   * using bitwise comparison.
-   * @param c The code unit to search for.
-   * @return The offset into this of `c`, or -1 if not found.
-   * @stable ICU 2.0
-   */
-  inline int32_t indexOf(char16_t c) const;
-
-  /**
-   * Locate in this the first occurrence of the code point `c`,
-   * using bitwise comparison.
-   *
-   * @param c The code point to search for.
-   * @return The offset into this of `c`, or -1 if not found.
-   * @stable ICU 2.0
-   */
-  inline int32_t indexOf(UChar32 c) const;
-
-  /**
-   * Locate in this the first occurrence of the BMP code point `c`,
-   * starting at offset `start`, using bitwise comparison.
-   * @param c The code unit to search for.
-   * @param start The offset at which searching will start.
-   * @return The offset into this of `c`, or -1 if not found.
-   * @stable ICU 2.0
-   */
-  inline int32_t indexOf(char16_t c,
-              int32_t start) const;
-
-  /**
-   * Locate in this the first occurrence of the code point `c`
-   * starting at offset `start`, using bitwise comparison.
-   *
-   * @param c The code point to search for.
-   * @param start The offset at which searching will start.
-   * @return The offset into this of `c`, or -1 if not found.
-   * @stable ICU 2.0
-   */
-  inline int32_t indexOf(UChar32 c,
-              int32_t start) const;
-
-  /**
-   * Locate in this the first occurrence of the BMP code point `c`
-   * in the range [`start`, `start + length`),
-   * using bitwise comparison.
-   * @param c The code unit to search for.
-   * @param start the offset into this at which to start matching
-   * @param length the number of characters in this to search
-   * @return The offset into this of `c`, or -1 if not found.
-   * @stable ICU 2.0
-   */
-  inline int32_t indexOf(char16_t c,
-              int32_t start,
-              int32_t length) const;
-
-  /**
-   * Locate in this the first occurrence of the code point `c`
-   * in the range [`start`, `start + length`),
-   * using bitwise comparison.
-   *
-   * @param c The code point to search for.
-   * @param start the offset into this at which to start matching
-   * @param length the number of characters in this to search
-   * @return The offset into this of `c`, or -1 if not found.
-   * @stable ICU 2.0
-   */
-  inline int32_t indexOf(UChar32 c,
-              int32_t start,
-              int32_t length) const;
-
-  /**
-   * Locate in this the last occurrence of the characters in `text`,
-   * using bitwise comparison.
-   * @param text The text to search for.
-   * @return The offset into this of the start of `text`,
-   * or -1 if not found.
-   * @stable ICU 2.0
-   */
-  inline int32_t lastIndexOf(const UnicodeString& text) const;
-
-  /**
-   * Locate in this the last occurrence of the characters in `text`
-   * starting at offset `start`, using bitwise comparison.
-   * @param text The text to search for.
-   * @param start The offset at which searching will start.
-   * @return The offset into this of the start of `text`,
-   * or -1 if not found.
-   * @stable ICU 2.0
-   */
-  inline int32_t lastIndexOf(const UnicodeString& text,
-              int32_t start) const;
-
-  /**
-   * Locate in this the last occurrence in the range
-   * [`start`, `start + length`) of the characters
-   * in `text`, using bitwise comparison.
-   * @param text The text to search for.
-   * @param start The offset at which searching will start.
-   * @param length The number of characters to search
-   * @return The offset into this of the start of `text`,
-   * or -1 if not found.
-   * @stable ICU 2.0
-   */
-  inline int32_t lastIndexOf(const UnicodeString& text,
-              int32_t start,
-              int32_t length) const;
-
-  /**
-   * Locate in this the last occurrence in the range
-   * [`start`, `start + length`) of the characters
-   * in `srcText` in the range
-   * [`srcStart`, `srcStart + srcLength`),
-   * using bitwise comparison.
-   * @param srcText The text to search for.
-   * @param srcStart the offset into `srcText` at which
-   * to start matching
-   * @param srcLength the number of characters in `srcText` to match
-   * @param start the offset into this at which to start matching
-   * @param length the number of characters in this to search
-   * @return The offset into this of the start of `text`,
-   * or -1 if not found.
-   * @stable ICU 2.0
-   */
-  inline int32_t lastIndexOf(const UnicodeString& srcText,
-              int32_t srcStart,
-              int32_t srcLength,
-              int32_t start,
-              int32_t length) const;
-
-  /**
-   * Locate in this the last occurrence of the characters in `srcChars`
-   * starting at offset `start`, using bitwise comparison.
-   * @param srcChars The text to search for.
-   * @param srcLength the number of characters in `srcChars` to match
-   * @param start the offset into this at which to start matching
-   * @return The offset into this of the start of `text`,
-   * or -1 if not found.
-   * @stable ICU 2.0
-   */
-  inline int32_t lastIndexOf(const char16_t *srcChars,
-              int32_t srcLength,
-              int32_t start) const;
-
-  /**
-   * Locate in this the last occurrence in the range
-   * [`start`, `start + length`) of the characters
-   * in `srcChars`, using bitwise comparison.
-   * @param srcChars The text to search for.
-   * @param srcLength the number of characters in `srcChars`
-   * @param start The offset at which searching will start.
-   * @param length The number of characters to search
-   * @return The offset into this of the start of `srcChars`,
-   * or -1 if not found.
-   * @stable ICU 2.0
-   */
-  inline int32_t lastIndexOf(ConstChar16Ptr srcChars,
-              int32_t srcLength,
-              int32_t start,
-              int32_t length) const;
-
-  /**
-   * Locate in this the last occurrence in the range
-   * [`start`, `start + length`) of the characters
-   * in `srcChars` in the range
-   * [`srcStart`, `srcStart + srcLength`),
-   * using bitwise comparison.
-   * @param srcChars The text to search for.
-   * @param srcStart the offset into `srcChars` at which
-   * to start matching
-   * @param srcLength the number of characters in `srcChars` to match
-   * @param start the offset into this at which to start matching
-   * @param length the number of characters in this to search
-   * @return The offset into this of the start of `text`,
-   * or -1 if not found.
-   * @stable ICU 2.0
-   */
-  int32_t lastIndexOf(const char16_t *srcChars,
-              int32_t srcStart,
-              int32_t srcLength,
-              int32_t start,
-              int32_t length) const;
-
-  /**
-   * Locate in this the last occurrence of the BMP code point `c`,
-   * using bitwise comparison.
-   * @param c The code unit to search for.
-   * @return The offset into this of `c`, or -1 if not found.
-   * @stable ICU 2.0
-   */
-  inline int32_t lastIndexOf(char16_t c) const;
-
-  /**
-   * Locate in this the last occurrence of the code point `c`,
-   * using bitwise comparison.
-   *
-   * @param c The code point to search for.
-   * @return The offset into this of `c`, or -1 if not found.
-   * @stable ICU 2.0
-   */
-  inline int32_t lastIndexOf(UChar32 c) const;
-
-  /**
-   * Locate in this the last occurrence of the BMP code point `c`
-   * starting at offset `start`, using bitwise comparison.
-   * @param c The code unit to search for.
-   * @param start The offset at which searching will start.
-   * @return The offset into this of `c`, or -1 if not found.
-   * @stable ICU 2.0
-   */
-  inline int32_t lastIndexOf(char16_t c,
-              int32_t start) const;
-
-  /**
-   * Locate in this the last occurrence of the code point `c`
-   * starting at offset `start`, using bitwise comparison.
-   *
-   * @param c The code point to search for.
-   * @param start The offset at which searching will start.
-   * @return The offset into this of `c`, or -1 if not found.
-   * @stable ICU 2.0
-   */
-  inline int32_t lastIndexOf(UChar32 c,
-              int32_t start) const;
-
-  /**
-   * Locate in this the last occurrence of the BMP code point `c`
-   * in the range [`start`, `start + length`),
-   * using bitwise comparison.
-   * @param c The code unit to search for.
-   * @param start the offset into this at which to start matching
-   * @param length the number of characters in this to search
-   * @return The offset into this of `c`, or -1 if not found.
-   * @stable ICU 2.0
-   */
-  inline int32_t lastIndexOf(char16_t c,
-              int32_t start,
-              int32_t length) const;
-
-  /**
-   * Locate in this the last occurrence of the code point `c`
-   * in the range [`start`, `start + length`),
-   * using bitwise comparison.
-   *
-   * @param c The code point to search for.
-   * @param start the offset into this at which to start matching
-   * @param length the number of characters in this to search
-   * @return The offset into this of `c`, or -1 if not found.
-   * @stable ICU 2.0
-   */
-  inline int32_t lastIndexOf(UChar32 c,
-              int32_t start,
-              int32_t length) const;
-
-
-  /* Character access */
-
-  /**
-   * Return the code unit at offset `offset`.
-   * If the offset is not valid (0..length()-1) then U+ffff is returned.
-   * @param offset a valid offset into the text
-   * @return the code unit at offset `offset`
-   *         or 0xffff if the offset is not valid for this string
-   * @stable ICU 2.0
-   */
-  inline char16_t charAt(int32_t offset) const;
-
-  /**
-   * Return the code unit at offset `offset`.
-   * If the offset is not valid (0..length()-1) then U+ffff is returned.
-   * @param offset a valid offset into the text
-   * @return the code unit at offset `offset`
-   * @stable ICU 2.0
-   */
-  inline char16_t operator[] (int32_t offset) const;
-
-  /**
-   * Return the code point that contains the code unit
-   * at offset `offset`.
-   * If the offset is not valid (0..length()-1) then U+ffff is returned.
-   * @param offset a valid offset into the text
-   * that indicates the text offset of any of the code units
-   * that will be assembled into a code point (21-bit value) and returned
-   * @return the code point of text at `offset`
-   *         or 0xffff if the offset is not valid for this string
-   * @stable ICU 2.0
-   */
-  UChar32 char32At(int32_t offset) const;
-
-  /**
-   * Adjust a random-access offset so that
-   * it points to the beginning of a Unicode character.
-   * The offset that is passed in points to
-   * any code unit of a code point,
-   * while the returned offset will point to the first code unit
-   * of the same code point.
-   * In UTF-16, if the input offset points to a second surrogate
-   * of a surrogate pair, then the returned offset will point
-   * to the first surrogate.
-   * @param offset a valid offset into one code point of the text
-   * @return offset of the first code unit of the same code point
-   * @see U16_SET_CP_START
-   * @stable ICU 2.0
-   */
-  int32_t getChar32Start(int32_t offset) const;
-
-  /**
-   * Adjust a random-access offset so that
-   * it points behind a Unicode character.
-   * The offset that is passed in points behind
-   * any code unit of a code point,
-   * while the returned offset will point behind the last code unit
-   * of the same code point.
-   * In UTF-16, if the input offset points behind the first surrogate
-   * (i.e., to the second surrogate)
-   * of a surrogate pair, then the returned offset will point
-   * behind the second surrogate (i.e., to the first surrogate).
-   * @param offset a valid offset after any code unit of a code point of the text
-   * @return offset of the first code unit after the same code point
-   * @see U16_SET_CP_LIMIT
-   * @stable ICU 2.0
-   */
-  int32_t getChar32Limit(int32_t offset) const;
-
-  /**
-   * Move the code unit index along the string by delta code points.
-   * Interpret the input index as a code unit-based offset into the string,
-   * move the index forward or backward by delta code points, and
-   * return the resulting index.
-   * The input index should point to the first code unit of a code point,
-   * if there is more than one.
-   *
-   * Both input and output indexes are code unit-based as for all
-   * string indexes/offsets in ICU (and other libraries, like MBCS char*).
-   * If delta<0 then the index is moved backward (toward the start of the string).
-   * If delta>0 then the index is moved forward (toward the end of the string).
-   *
-   * This behaves like CharacterIterator::move32(delta, kCurrent).
-   *
-   * Behavior for out-of-bounds indexes:
-   * `moveIndex32` pins the input index to 0..length(), i.e.,
-   * if the input index<0 then it is pinned to 0;
-   * if it is index>length() then it is pinned to length().
-   * Afterwards, the index is moved by `delta` code points
-   * forward or backward,
-   * but no further backward than to 0 and no further forward than to length().
-   * The resulting index return value will be in between 0 and length(), inclusively.
-   *
-   * Examples:
-   * \code
-   *     // s has code points 'a' U+10000 'b' U+10ffff U+2029
-   *     UnicodeString s(u"a\U00010000b\U0010ffff\u2029");
-   *
-   *     // initial index: position of U+10000
-   *     int32_t index=1;
-   *
-   *     // the following examples will all result in index==4, position of U+10ffff
-   *
-   *     // skip 2 code points from some position in the string
-   *     index=s.moveIndex32(index, 2); // skips U+10000 and 'b'
-   *
-   *     // go to the 3rd code point from the start of s (0-based)
-   *     index=s.moveIndex32(0, 3); // skips 'a', U+10000, and 'b'
-   *
-   *     // go to the next-to-last code point of s
-   *     index=s.moveIndex32(s.length(), -2); // backward-skips U+2029 and U+10ffff
-   * \endcode
-   *
-   * @param index input code unit index
-   * @param delta (signed) code point count to move the index forward or backward
-   *        in the string
-   * @return the resulting code unit index
-   * @stable ICU 2.0
-   */
-  int32_t moveIndex32(int32_t index, int32_t delta) const;
-
-  /* Substring extraction */
-
-  /**
-   * Copy the characters in the range
-   * [`start`, `start + length`) into the array `dst`,
-   * beginning at `dstStart`.
-   * If the string aliases to `dst` itself as an external buffer,
-   * then extract() will not copy the contents.
-   *
-   * @param start offset of first character which will be copied into the array
-   * @param length the number of characters to extract
-   * @param dst array in which to copy characters.  The length of `dst`
-   * must be at least (`dstStart + length`).
-   * @param dstStart the offset in `dst` where the first character
-   * will be extracted
-   * @stable ICU 2.0
-   */
-  inline void extract(int32_t start,
-           int32_t length,
-           Char16Ptr dst,
-           int32_t dstStart = 0) const;
-
-  /**
-   * Copy the contents of the string into dest.
-   * This is a convenience function that
-   * checks if there is enough space in dest,
-   * extracts the entire string if possible,
-   * and NUL-terminates dest if possible.
-   *
-   * If the string fits into dest but cannot be NUL-terminated
-   * (length()==destCapacity) then the error code is set to U_STRING_NOT_TERMINATED_WARNING.
-   * If the string itself does not fit into dest
-   * (length()>destCapacity) then the error code is set to U_BUFFER_OVERFLOW_ERROR.
-   *
-   * If the string aliases to `dest` itself as an external buffer,
-   * then extract() will not copy the contents.
-   *
-   * @param dest Destination string buffer.
-   * @param destCapacity Number of char16_ts available at dest.
-   * @param errorCode ICU error code.
-   * @return length()
-   * @stable ICU 2.0
-   */
-  int32_t
-  extract(Char16Ptr dest, int32_t destCapacity,
-          UErrorCode &errorCode) const;
-
-  /**
-   * Copy the characters in the range
-   * [`start`, `start + length`) into the  UnicodeString
-   * `target`.
-   * @param start offset of first character which will be copied
-   * @param length the number of characters to extract
-   * @param target UnicodeString into which to copy characters.
-   * @stable ICU 2.0
-   */
-  inline void extract(int32_t start,
-           int32_t length,
-           UnicodeString& target) const;
-
-  /**
-   * Copy the characters in the range [`start`, `limit`)
-   * into the array `dst`, beginning at `dstStart`.
-   * @param start offset of first character which will be copied into the array
-   * @param limit offset immediately following the last character to be copied
-   * @param dst array in which to copy characters.  The length of `dst`
-   * must be at least (`dstStart + (limit - start)`).
-   * @param dstStart the offset in `dst` where the first character
-   * will be extracted
-   * @stable ICU 2.0
-   */
-  inline void extractBetween(int32_t start,
-              int32_t limit,
-              char16_t *dst,
-              int32_t dstStart = 0) const;
-
-  /**
-   * Copy the characters in the range [`start`, `limit`)
-   * into the UnicodeString `target`.  Replaceable API.
-   * @param start offset of first character which will be copied
-   * @param limit offset immediately following the last character to be copied
-   * @param target UnicodeString into which to copy characters.
-   * @stable ICU 2.0
-   */
-  virtual void extractBetween(int32_t start,
-              int32_t limit,
-              UnicodeString& target) const;
-
-  /**
-   * Copy the characters in the range
-   * [`start`, `start + startLength`) into an array of characters.
-   * All characters must be invariant (see utypes.h).
-   * Use US_INV as the last, signature-distinguishing parameter.
-   *
-   * This function does not write any more than `targetCapacity`
-   * characters but returns the length of the entire output string
-   * so that one can allocate a larger buffer and call the function again
-   * if necessary.
-   * The output string is NUL-terminated if possible.
-   *
-   * @param start offset of first character which will be copied
-   * @param startLength the number of characters to extract
-   * @param target the target buffer for extraction, can be NULL
-   *               if targetLength is 0
-   * @param targetCapacity the length of the target buffer
-   * @param inv Signature-distinguishing paramater, use US_INV.
-   * @return the output string length, not including the terminating NUL
-   * @stable ICU 3.2
-   */
-  int32_t extract(int32_t start,
-           int32_t startLength,
-           char *target,
-           int32_t targetCapacity,
-           enum EInvariant inv) const;
-
-#if U_CHARSET_IS_UTF8 || !UCONFIG_NO_CONVERSION
-
-  /**
-   * Copy the characters in the range
-   * [`start`, `start + length`) into an array of characters
-   * in the platform's default codepage.
-   * This function does not write any more than `targetLength`
-   * characters but returns the length of the entire output string
-   * so that one can allocate a larger buffer and call the function again
-   * if necessary.
-   * The output string is NUL-terminated if possible.
-   *
-   * @param start offset of first character which will be copied
-   * @param startLength the number of characters to extract
-   * @param target the target buffer for extraction
-   * @param targetLength the length of the target buffer
-   * If `target` is NULL, then the number of bytes required for
-   * `target` is returned.
-   * @return the output string length, not including the terminating NUL
-   * @stable ICU 2.0
-   */
-  int32_t extract(int32_t start,
-           int32_t startLength,
-           char *target,
-           uint32_t targetLength) const;
-
-#endif
-
-#if !UCONFIG_NO_CONVERSION
-
-  /**
-   * Copy the characters in the range
-   * [`start`, `start + length`) into an array of characters
-   * in a specified codepage.
-   * The output string is NUL-terminated.
-   *
-   * Recommendation: For invariant-character strings use
-   * extract(int32_t start, int32_t length, char *target, int32_t targetCapacity, enum EInvariant inv) const
-   * because it avoids object code dependencies of UnicodeString on
-   * the conversion code.
-   *
-   * @param start offset of first character which will be copied
-   * @param startLength the number of characters to extract
-   * @param target the target buffer for extraction
-   * @param codepage the desired codepage for the characters.  0 has
-   * the special meaning of the default codepage
-   * If `codepage` is an empty string (`""`),
-   * then a simple conversion is performed on the codepage-invariant
-   * subset ("invariant characters") of the platform encoding. See utypes.h.
-   * If `target` is NULL, then the number of bytes required for
-   * `target` is returned. It is assumed that the target is big enough
-   * to fit all of the characters.
-   * @return the output string length, not including the terminating NUL
-   * @stable ICU 2.0
-   */
-  inline int32_t extract(int32_t start,
-                 int32_t startLength,
-                 char *target,
-                 const char *codepage = 0) const;
-
-  /**
-   * Copy the characters in the range
-   * [`start`, `start + length`) into an array of characters
-   * in a specified codepage.
-   * This function does not write any more than `targetLength`
-   * characters but returns the length of the entire output string
-   * so that one can allocate a larger buffer and call the function again
-   * if necessary.
-   * The output string is NUL-terminated if possible.
-   *
-   * Recommendation: For invariant-character strings use
-   * extract(int32_t start, int32_t length, char *target, int32_t targetCapacity, enum EInvariant inv) const
-   * because it avoids object code dependencies of UnicodeString on
-   * the conversion code.
-   *
-   * @param start offset of first character which will be copied
-   * @param startLength the number of characters to extract
-   * @param target the target buffer for extraction
-   * @param targetLength the length of the target buffer
-   * @param codepage the desired codepage for the characters.  0 has
-   * the special meaning of the default codepage
-   * If `codepage` is an empty string (`""`),
-   * then a simple conversion is performed on the codepage-invariant
-   * subset ("invariant characters") of the platform encoding. See utypes.h.
-   * If `target` is NULL, then the number of bytes required for
-   * `target` is returned.
-   * @return the output string length, not including the terminating NUL
-   * @stable ICU 2.0
-   */
-  int32_t extract(int32_t start,
-           int32_t startLength,
-           char *target,
-           uint32_t targetLength,
-           const char *codepage) const;
-
-  /**
-   * Convert the UnicodeString into a codepage string using an existing UConverter.
-   * The output string is NUL-terminated if possible.
-   *
-   * This function avoids the overhead of opening and closing a converter if
-   * multiple strings are extracted.
-   *
-   * @param dest destination string buffer, can be NULL if destCapacity==0
-   * @param destCapacity the number of chars available at dest
-   * @param cnv the converter object to be used (ucnv_resetFromUnicode() will be called),
-   *        or NULL for the default converter
-   * @param errorCode normal ICU error code
-   * @return the length of the output string, not counting the terminating NUL;
-   *         if the length is greater than destCapacity, then the string will not fit
-   *         and a buffer of the indicated length would need to be passed in
-   * @stable ICU 2.0
-   */
-  int32_t extract(char *dest, int32_t destCapacity,
-                  UConverter *cnv,
-                  UErrorCode &errorCode) const;
-
-#endif
-
-  /**
-   * Create a temporary substring for the specified range.
-   * Unlike the substring constructor and setTo() functions,
-   * the object returned here will be a read-only alias (using getBuffer())
-   * rather than copying the text.
-   * As a result, this substring operation is much faster but requires
-   * that the original string not be modified or deleted during the lifetime
-   * of the returned substring object.
-   * @param start offset of the first character visible in the substring
-   * @param length length of the substring
-   * @return a read-only alias UnicodeString object for the substring
-   * @stable ICU 4.4
-   */
-  UnicodeString tempSubString(int32_t start=0, int32_t length=INT32_MAX) const;
-
-  /**
-   * Create a temporary substring for the specified range.
-   * Same as tempSubString(start, length) except that the substring range
-   * is specified as a (start, limit) pair (with an exclusive limit index)
-   * rather than a (start, length) pair.
-   * @param start offset of the first character visible in the substring
-   * @param limit offset immediately following the last character visible in the substring
-   * @return a read-only alias UnicodeString object for the substring
-   * @stable ICU 4.4
-   */
-  inline UnicodeString tempSubStringBetween(int32_t start, int32_t limit=INT32_MAX) const;
-
-  /**
-   * Convert the UnicodeString to UTF-8 and write the result
-   * to a ByteSink. This is called by toUTF8String().
-   * Unpaired surrogates are replaced with U+FFFD.
-   * Calls u_strToUTF8WithSub().
-   *
-   * @param sink A ByteSink to which the UTF-8 version of the string is written.
-   *             sink.Flush() is called at the end.
-   * @stable ICU 4.2
-   * @see toUTF8String
-   */
-  void toUTF8(ByteSink &sink) const;
-
-  /**
-   * Convert the UnicodeString to UTF-8 and append the result
-   * to a standard string.
-   * Unpaired surrogates are replaced with U+FFFD.
-   * Calls toUTF8().
-   *
-   * @param result A standard string (or a compatible object)
-   *        to which the UTF-8 version of the string is appended.
-   * @return The string object.
-   * @stable ICU 4.2
-   * @see toUTF8
-   */
-  template<typename StringClass>
-  StringClass &toUTF8String(StringClass &result) const {
-    StringByteSink<StringClass> sbs(&result, length());
-    toUTF8(sbs);
-    return result;
-  }
-
-  /**
-   * Convert the UnicodeString to UTF-32.
-   * Unpaired surrogates are replaced with U+FFFD.
-   * Calls u_strToUTF32WithSub().
-   *
-   * @param utf32 destination string buffer, can be NULL if capacity==0
-   * @param capacity the number of UChar32s available at utf32
-   * @param errorCode Standard ICU error code. Its input value must
-   *                  pass the U_SUCCESS() test, or else the function returns
-   *                  immediately. Check for U_FAILURE() on output or use with
-   *                  function chaining. (See User Guide for details.)
-   * @return The length of the UTF-32 string.
-   * @see fromUTF32
-   * @stable ICU 4.2
-   */
-  int32_t toUTF32(UChar32 *utf32, int32_t capacity, UErrorCode &errorCode) const;
-
-  /* Length operations */
-
-  /**
-   * Return the length of the UnicodeString object.
-   * The length is the number of char16_t code units are in the UnicodeString.
-   * If you want the number of code points, please use countChar32().
-   * @return the length of the UnicodeString object
-   * @see countChar32
-   * @stable ICU 2.0
-   */
-  inline int32_t length(void) const;
-
-  /**
-   * Count Unicode code points in the length char16_t code units of the string.
-   * A code point may occupy either one or two char16_t code units.
-   * Counting code points involves reading all code units.
-   *
-   * This functions is basically the inverse of moveIndex32().
-   *
-   * @param start the index of the first code unit to check
-   * @param length the number of char16_t code units to check
-   * @return the number of code points in the specified code units
-   * @see length
-   * @stable ICU 2.0
-   */
-  int32_t
-  countChar32(int32_t start=0, int32_t length=INT32_MAX) const;
-
-  /**
-   * Check if the length char16_t code units of the string
-   * contain more Unicode code points than a certain number.
-   * This is more efficient than counting all code points in this part of the string
-   * and comparing that number with a threshold.
-   * This function may not need to scan the string at all if the length
-   * falls within a certain range, and
-   * never needs to count more than 'number+1' code points.
-   * Logically equivalent to (countChar32(start, length)>number).
-   * A Unicode code point may occupy either one or two char16_t code units.
-   *
-   * @param start the index of the first code unit to check (0 for the entire string)
-   * @param length the number of char16_t code units to check
-   *               (use INT32_MAX for the entire string; remember that start/length
-   *                values are pinned)
-   * @param number The number of code points in the (sub)string is compared against
-   *               the 'number' parameter.
-   * @return Boolean value for whether the string contains more Unicode code points
-   *         than 'number'. Same as (u_countChar32(s, length)>number).
-   * @see countChar32
-   * @see u_strHasMoreChar32Than
-   * @stable ICU 2.4
-   */
-  UBool
-  hasMoreChar32Than(int32_t start, int32_t length, int32_t number) const;
-
-  /**
-   * Determine if this string is empty.
-   * @return TRUE if this string contains 0 characters, FALSE otherwise.
-   * @stable ICU 2.0
-   */
-  inline UBool isEmpty(void) const;
-
-  /**
-   * Return the capacity of the internal buffer of the UnicodeString object.
-   * This is useful together with the getBuffer functions.
-   * See there for details.
-   *
-   * @return the number of char16_ts available in the internal buffer
-   * @see getBuffer
-   * @stable ICU 2.0
-   */
-  inline int32_t getCapacity(void) const;
-
-  /* Other operations */
-
-  /**
-   * Generate a hash code for this object.
-   * @return The hash code of this UnicodeString.
-   * @stable ICU 2.0
-   */
-  inline int32_t hashCode(void) const;
-
-  /**
-   * Determine if this object contains a valid string.
-   * A bogus string has no value. It is different from an empty string,
-   * although in both cases isEmpty() returns TRUE and length() returns 0.
-   * setToBogus() and isBogus() can be used to indicate that no string value is available.
-   * For a bogus string, getBuffer() and getTerminatedBuffer() return NULL, and
-   * length() returns 0.
-   *
-   * @return TRUE if the string is bogus/invalid, FALSE otherwise
-   * @see setToBogus()
-   * @stable ICU 2.0
-   */
-  inline UBool isBogus(void) const;
-
-
-  //========================================
-  // Write operations
-  //========================================
-
-  /* Assignment operations */
-
-  /**
-   * Assignment operator.  Replace the characters in this UnicodeString
-   * with the characters from `srcText`.
-   *
-   * Starting with ICU 2.4, the assignment operator and the copy constructor
-   * allocate a new buffer and copy the buffer contents even for readonly aliases.
-   * By contrast, the fastCopyFrom() function implements the old,
-   * more efficient but less safe behavior
-   * of making this string also a readonly alias to the same buffer.
-   *
-   * If the source object has an "open" buffer from getBuffer(minCapacity),
-   * then the copy is an empty string.
-   *
-   * @param srcText The text containing the characters to replace
-   * @return a reference to this
-   * @stable ICU 2.0
-   * @see fastCopyFrom
-   */
-  UnicodeString &operator=(const UnicodeString &srcText);
-
-  /**
-   * Almost the same as the assignment operator.
-   * Replace the characters in this UnicodeString
-   * with the characters from `srcText`.
-   *
-   * This function works the same as the assignment operator
-   * for all strings except for ones that are readonly aliases.
-   *
-   * Starting with ICU 2.4, the assignment operator and the copy constructor
-   * allocate a new buffer and copy the buffer contents even for readonly aliases.
-   * This function implements the old, more efficient but less safe behavior
-   * of making this string also a readonly alias to the same buffer.
-   *
-   * The fastCopyFrom function must be used only if it is known that the lifetime of
-   * this UnicodeString does not exceed the lifetime of the aliased buffer
-   * including its contents, for example for strings from resource bundles
-   * or aliases to string constants.
-   *
-   * If the source object has an "open" buffer from getBuffer(minCapacity),
-   * then the copy is an empty string.
-   *
-   * @param src The text containing the characters to replace.
-   * @return a reference to this
-   * @stable ICU 2.4
-   */
-  UnicodeString &fastCopyFrom(const UnicodeString &src);
-
-  /**
-   * Move assignment operator; might leave src in bogus state.
-   * This string will have the same contents and state that the source string had.
-   * The behavior is undefined if *this and src are the same object.
-   * @param src source string
-   * @return *this
-   * @stable ICU 56
-   */
-  UnicodeString &operator=(UnicodeString &&src) U_NOEXCEPT;
-
-  /**
-   * Swap strings.
-   * @param other other string
-   * @stable ICU 56
-   */
-  void swap(UnicodeString &other) U_NOEXCEPT;
-
-  /**
-   * Non-member UnicodeString swap function.
-   * @param s1 will get s2's contents and state
-   * @param s2 will get s1's contents and state
-   * @stable ICU 56
-   */
-  friend inline void U_EXPORT2
-  swap(UnicodeString &s1, UnicodeString &s2) U_NOEXCEPT {
-    s1.swap(s2);
-  }
-
-  /**
-   * Assignment operator.  Replace the characters in this UnicodeString
-   * with the code unit `ch`.
-   * @param ch the code unit to replace
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& operator= (char16_t ch);
-
-  /**
-   * Assignment operator.  Replace the characters in this UnicodeString
-   * with the code point `ch`.
-   * @param ch the code point to replace
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& operator= (UChar32 ch);
-
-  /**
-   * Set the text in the UnicodeString object to the characters
-   * in `srcText` in the range
-   * [`srcStart`, `srcText.length()`).
-   * `srcText` is not modified.
-   * @param srcText the source for the new characters
-   * @param srcStart the offset into `srcText` where new characters
-   * will be obtained
-   * @return a reference to this
-   * @stable ICU 2.2
-   */
-  inline UnicodeString& setTo(const UnicodeString& srcText,
-               int32_t srcStart);
-
-  /**
-   * Set the text in the UnicodeString object to the characters
-   * in `srcText` in the range
-   * [`srcStart`, `srcStart + srcLength`).
-   * `srcText` is not modified.
-   * @param srcText the source for the new characters
-   * @param srcStart the offset into `srcText` where new characters
-   * will be obtained
-   * @param srcLength the number of characters in `srcText` in the
-   * replace string.
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& setTo(const UnicodeString& srcText,
-               int32_t srcStart,
-               int32_t srcLength);
-
-  /**
-   * Set the text in the UnicodeString object to the characters in
-   * `srcText`.
-   * `srcText` is not modified.
-   * @param srcText the source for the new characters
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& setTo(const UnicodeString& srcText);
-
-  /**
-   * Set the characters in the UnicodeString object to the characters
-   * in `srcChars`. `srcChars` is not modified.
-   * @param srcChars the source for the new characters
-   * @param srcLength the number of Unicode characters in srcChars.
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& setTo(const char16_t *srcChars,
-               int32_t srcLength);
-
-  /**
-   * Set the characters in the UnicodeString object to the code unit
-   * `srcChar`.
-   * @param srcChar the code unit which becomes the UnicodeString's character
-   * content
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& setTo(char16_t srcChar);
-
-  /**
-   * Set the characters in the UnicodeString object to the code point
-   * `srcChar`.
-   * @param srcChar the code point which becomes the UnicodeString's character
-   * content
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& setTo(UChar32 srcChar);
-
-  /**
-   * Aliasing setTo() function, analogous to the readonly-aliasing char16_t* constructor.
-   * The text will be used for the UnicodeString object, but
-   * it will not be released when the UnicodeString is destroyed.
-   * This has copy-on-write semantics:
-   * When the string is modified, then the buffer is first copied into
-   * newly allocated memory.
-   * The aliased buffer is never modified.
-   *
-   * In an assignment to another UnicodeString, when using the copy constructor
-   * or the assignment operator, the text will be copied.
-   * When using fastCopyFrom(), the text will be aliased again,
-   * so that both strings then alias the same readonly-text.
-   *
-   * @param isTerminated specifies if `text` is `NUL`-terminated.
-   *                     This must be true if `textLength==-1`.
-   * @param text The characters to alias for the UnicodeString.
-   * @param textLength The number of Unicode characters in `text` to alias.
-   *                   If -1, then this constructor will determine the length
-   *                   by calling `u_strlen()`.
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  UnicodeString &setTo(UBool isTerminated,
-                       ConstChar16Ptr text,
-                       int32_t textLength);
-
-  /**
-   * Aliasing setTo() function, analogous to the writable-aliasing char16_t* constructor.
-   * The text will be used for the UnicodeString object, but
-   * it will not be released when the UnicodeString is destroyed.
-   * This has write-through semantics:
-   * For as long as the capacity of the buffer is sufficient, write operations
-   * will directly affect the buffer. When more capacity is necessary, then
-   * a new buffer will be allocated and the contents copied as with regularly
-   * constructed strings.
-   * In an assignment to another UnicodeString, the buffer will be copied.
-   * The extract(Char16Ptr dst) function detects whether the dst pointer is the same
-   * as the string buffer itself and will in this case not copy the contents.
-   *
-   * @param buffer The characters to alias for the UnicodeString.
-   * @param buffLength The number of Unicode characters in `buffer` to alias.
-   * @param buffCapacity The size of `buffer` in char16_ts.
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  UnicodeString &setTo(char16_t *buffer,
-                       int32_t buffLength,
-                       int32_t buffCapacity);
-
-  /**
-   * Make this UnicodeString object invalid.
-   * The string will test TRUE with isBogus().
-   *
-   * A bogus string has no value. It is different from an empty string.
-   * It can be used to indicate that no string value is available.
-   * getBuffer() and getTerminatedBuffer() return NULL, and
-   * length() returns 0.
-   *
-   * This utility function is used throughout the UnicodeString
-   * implementation to indicate that a UnicodeString operation failed,
-   * and may be used in other functions,
-   * especially but not exclusively when such functions do not
-   * take a UErrorCode for simplicity.
-   *
-   * The following methods, and no others, will clear a string object's bogus flag:
-   * - remove()
-   * - remove(0, INT32_MAX)
-   * - truncate(0)
-   * - operator=() (assignment operator)
-   * - setTo(...)
-   *
-   * The simplest ways to turn a bogus string into an empty one
-   * is to use the remove() function.
-   * Examples for other functions that are equivalent to "set to empty string":
-   * \code
-   * if(s.isBogus()) {
-   *   s.remove();           // set to an empty string (remove all), or
-   *   s.remove(0, INT32_MAX); // set to an empty string (remove all), or
-   *   s.truncate(0);        // set to an empty string (complete truncation), or
-   *   s=UnicodeString();    // assign an empty string, or
-   *   s.setTo((UChar32)-1); // set to a pseudo code point that is out of range, or
-   *   s.setTo(u"", 0);      // set to an empty C Unicode string
-   * }
-   * \endcode
-   *
-   * @see isBogus()
-   * @stable ICU 2.0
-   */
-  void setToBogus();
-
-  /**
-   * Set the character at the specified offset to the specified character.
-   * @param offset A valid offset into the text of the character to set
-   * @param ch The new character
-   * @return A reference to this
-   * @stable ICU 2.0
-   */
-  UnicodeString& setCharAt(int32_t offset,
-               char16_t ch);
-
-
-  /* Append operations */
-
-  /**
-   * Append operator. Append the code unit `ch` to the UnicodeString
-   * object.
-   * @param ch the code unit to be appended
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
- inline  UnicodeString& operator+= (char16_t ch);
-
-  /**
-   * Append operator. Append the code point `ch` to the UnicodeString
-   * object.
-   * @param ch the code point to be appended
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
- inline  UnicodeString& operator+= (UChar32 ch);
-
-  /**
-   * Append operator. Append the characters in `srcText` to the
-   * UnicodeString object. `srcText` is not modified.
-   * @param srcText the source for the new characters
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& operator+= (const UnicodeString& srcText);
-
-  /**
-   * Append the characters
-   * in `srcText` in the range
-   * [`srcStart`, `srcStart + srcLength`) to the
-   * UnicodeString object at offset `start`. `srcText`
-   * is not modified.
-   * @param srcText the source for the new characters
-   * @param srcStart the offset into `srcText` where new characters
-   * will be obtained
-   * @param srcLength the number of characters in `srcText` in
-   * the append string
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& append(const UnicodeString& srcText,
-            int32_t srcStart,
-            int32_t srcLength);
-
-  /**
-   * Append the characters in `srcText` to the UnicodeString object.
-   * `srcText` is not modified.
-   * @param srcText the source for the new characters
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& append(const UnicodeString& srcText);
-
-  /**
-   * Append the characters in `srcChars` in the range
-   * [`srcStart`, `srcStart + srcLength`) to the UnicodeString
-   * object at offset
-   * `start`. `srcChars` is not modified.
-   * @param srcChars the source for the new characters
-   * @param srcStart the offset into `srcChars` where new characters
-   * will be obtained
-   * @param srcLength the number of characters in `srcChars` in
-   *                  the append string; can be -1 if `srcChars` is NUL-terminated
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& append(const char16_t *srcChars,
-            int32_t srcStart,
-            int32_t srcLength);
-
-  /**
-   * Append the characters in `srcChars` to the UnicodeString object
-   * at offset `start`. `srcChars` is not modified.
-   * @param srcChars the source for the new characters
-   * @param srcLength the number of Unicode characters in `srcChars`;
-   *                  can be -1 if `srcChars` is NUL-terminated
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& append(ConstChar16Ptr srcChars,
-            int32_t srcLength);
-
-  /**
-   * Append the code unit `srcChar` to the UnicodeString object.
-   * @param srcChar the code unit to append
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& append(char16_t srcChar);
-
-  /**
-   * Append the code point `srcChar` to the UnicodeString object.
-   * @param srcChar the code point to append
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  UnicodeString& append(UChar32 srcChar);
-
-
-  /* Insert operations */
-
-  /**
-   * Insert the characters in `srcText` in the range
-   * [`srcStart`, `srcStart + srcLength`) into the UnicodeString
-   * object at offset `start`. `srcText` is not modified.
-   * @param start the offset where the insertion begins
-   * @param srcText the source for the new characters
-   * @param srcStart the offset into `srcText` where new characters
-   * will be obtained
-   * @param srcLength the number of characters in `srcText` in
-   * the insert string
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& insert(int32_t start,
-            const UnicodeString& srcText,
-            int32_t srcStart,
-            int32_t srcLength);
-
-  /**
-   * Insert the characters in `srcText` into the UnicodeString object
-   * at offset `start`. `srcText` is not modified.
-   * @param start the offset where the insertion begins
-   * @param srcText the source for the new characters
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& insert(int32_t start,
-            const UnicodeString& srcText);
-
-  /**
-   * Insert the characters in `srcChars` in the range
-   * [`srcStart`, `srcStart + srcLength`) into the UnicodeString
-   *  object at offset `start`. `srcChars` is not modified.
-   * @param start the offset at which the insertion begins
-   * @param srcChars the source for the new characters
-   * @param srcStart the offset into `srcChars` where new characters
-   * will be obtained
-   * @param srcLength the number of characters in `srcChars`
-   * in the insert string
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& insert(int32_t start,
-            const char16_t *srcChars,
-            int32_t srcStart,
-            int32_t srcLength);
-
-  /**
-   * Insert the characters in `srcChars` into the UnicodeString object
-   * at offset `start`. `srcChars` is not modified.
-   * @param start the offset where the insertion begins
-   * @param srcChars the source for the new characters
-   * @param srcLength the number of Unicode characters in srcChars.
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& insert(int32_t start,
-            ConstChar16Ptr srcChars,
-            int32_t srcLength);
-
-  /**
-   * Insert the code unit `srcChar` into the UnicodeString object at
-   * offset `start`.
-   * @param start the offset at which the insertion occurs
-   * @param srcChar the code unit to insert
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& insert(int32_t start,
-            char16_t srcChar);
-
-  /**
-   * Insert the code point `srcChar` into the UnicodeString object at
-   * offset `start`.
-   * @param start the offset at which the insertion occurs
-   * @param srcChar the code point to insert
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& insert(int32_t start,
-            UChar32 srcChar);
-
-
-  /* Replace operations */
-
-  /**
-   * Replace the characters in the range
-   * [`start`, `start + length`) with the characters in
-   * `srcText` in the range
-   * [`srcStart`, `srcStart + srcLength`).
-   * `srcText` is not modified.
-   * @param start the offset at which the replace operation begins
-   * @param length the number of characters to replace. The character at
-   * `start + length` is not modified.
-   * @param srcText the source for the new characters
-   * @param srcStart the offset into `srcText` where new characters
-   * will be obtained
-   * @param srcLength the number of characters in `srcText` in
-   * the replace string
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& replace(int32_t start,
-             int32_t length,
-             const UnicodeString& srcText,
-             int32_t srcStart,
-             int32_t srcLength);
-
-  /**
-   * Replace the characters in the range
-   * [`start`, `start + length`)
-   * with the characters in `srcText`.  `srcText` is
-   *  not modified.
-   * @param start the offset at which the replace operation begins
-   * @param length the number of characters to replace. The character at
-   * `start + length` is not modified.
-   * @param srcText the source for the new characters
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& replace(int32_t start,
-             int32_t length,
-             const UnicodeString& srcText);
-
-  /**
-   * Replace the characters in the range
-   * [`start`, `start + length`) with the characters in
-   * `srcChars` in the range
-   * [`srcStart`, `srcStart + srcLength`). `srcChars`
-   * is not modified.
-   * @param start the offset at which the replace operation begins
-   * @param length the number of characters to replace.  The character at
-   * `start + length` is not modified.
-   * @param srcChars the source for the new characters
-   * @param srcStart the offset into `srcChars` where new characters
-   * will be obtained
-   * @param srcLength the number of characters in `srcChars`
-   * in the replace string
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& replace(int32_t start,
-             int32_t length,
-             const char16_t *srcChars,
-             int32_t srcStart,
-             int32_t srcLength);
-
-  /**
-   * Replace the characters in the range
-   * [`start`, `start + length`) with the characters in
-   * `srcChars`.  `srcChars` is not modified.
-   * @param start the offset at which the replace operation begins
-   * @param length number of characters to replace.  The character at
-   * `start + length` is not modified.
-   * @param srcChars the source for the new characters
-   * @param srcLength the number of Unicode characters in srcChars
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& replace(int32_t start,
-             int32_t length,
-             ConstChar16Ptr srcChars,
-             int32_t srcLength);
-
-  /**
-   * Replace the characters in the range
-   * [`start`, `start + length`) with the code unit
-   * `srcChar`.
-   * @param start the offset at which the replace operation begins
-   * @param length the number of characters to replace.  The character at
-   * `start + length` is not modified.
-   * @param srcChar the new code unit
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& replace(int32_t start,
-             int32_t length,
-             char16_t srcChar);
-
-  /**
-   * Replace the characters in the range
-   * [`start`, `start + length`) with the code point
-   * `srcChar`.
-   * @param start the offset at which the replace operation begins
-   * @param length the number of characters to replace.  The character at
-   * `start + length` is not modified.
-   * @param srcChar the new code point
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  UnicodeString& replace(int32_t start, int32_t length, UChar32 srcChar);
-
-  /**
-   * Replace the characters in the range [`start`, `limit`)
-   * with the characters in `srcText`. `srcText` is not modified.
-   * @param start the offset at which the replace operation begins
-   * @param limit the offset immediately following the replace range
-   * @param srcText the source for the new characters
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& replaceBetween(int32_t start,
-                int32_t limit,
-                const UnicodeString& srcText);
-
-  /**
-   * Replace the characters in the range [`start`, `limit`)
-   * with the characters in `srcText` in the range
-   * [`srcStart`, `srcLimit`). `srcText` is not modified.
-   * @param start the offset at which the replace operation begins
-   * @param limit the offset immediately following the replace range
-   * @param srcText the source for the new characters
-   * @param srcStart the offset into `srcChars` where new characters
-   * will be obtained
-   * @param srcLimit the offset immediately following the range to copy
-   * in `srcText`
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& replaceBetween(int32_t start,
-                int32_t limit,
-                const UnicodeString& srcText,
-                int32_t srcStart,
-                int32_t srcLimit);
-
-  /**
-   * Replace a substring of this object with the given text.
-   * @param start the beginning index, inclusive; `0 <= start <= limit`.
-   * @param limit the ending index, exclusive; `start <= limit <= length()`.
-   * @param text the text to replace characters `start` to `limit - 1`
-   * @stable ICU 2.0
-   */
-  virtual void handleReplaceBetween(int32_t start,
-                                    int32_t limit,
-                                    const UnicodeString& text);
-
-  /**
-   * Replaceable API
-   * @return TRUE if it has MetaData
-   * @stable ICU 2.4
-   */
-  virtual UBool hasMetaData() const;
-
-  /**
-   * Copy a substring of this object, retaining attribute (out-of-band)
-   * information.  This method is used to duplicate or reorder substrings.
-   * The destination index must not overlap the source range.
-   *
-   * @param start the beginning index, inclusive; `0 <= start <= limit`.
-   * @param limit the ending index, exclusive; `start <= limit <= length()`.
-   * @param dest the destination index.  The characters from
-   *             `start..limit-1` will be copied to `dest`.
-   * Implementations of this method may assume that `dest <= start ||
-   * dest >= limit`.
-   * @stable ICU 2.0
-   */
-  virtual void copy(int32_t start, int32_t limit, int32_t dest);
-
-  /* Search and replace operations */
-
-  /**
-   * Replace all occurrences of characters in oldText with the characters
-   * in newText
-   * @param oldText the text containing the search text
-   * @param newText the text containing the replacement text
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& findAndReplace(const UnicodeString& oldText,
-                const UnicodeString& newText);
-
-  /**
-   * Replace all occurrences of characters in oldText with characters
-   * in newText
-   * in the range [`start`, `start + length`).
-   * @param start the start of the range in which replace will performed
-   * @param length the length of the range in which replace will be performed
-   * @param oldText the text containing the search text
-   * @param newText the text containing the replacement text
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& findAndReplace(int32_t start,
-                int32_t length,
-                const UnicodeString& oldText,
-                const UnicodeString& newText);
-
-  /**
-   * Replace all occurrences of characters in oldText in the range
-   * [`oldStart`, `oldStart + oldLength`) with the characters
-   * in newText in the range
-   * [`newStart`, `newStart + newLength`)
-   * in the range [`start`, `start + length`).
-   * @param start the start of the range in which replace will performed
-   * @param length the length of the range in which replace will be performed
-   * @param oldText the text containing the search text
-   * @param oldStart the start of the search range in `oldText`
-   * @param oldLength the length of the search range in `oldText`
-   * @param newText the text containing the replacement text
-   * @param newStart the start of the replacement range in `newText`
-   * @param newLength the length of the replacement range in `newText`
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  UnicodeString& findAndReplace(int32_t start,
-                int32_t length,
-                const UnicodeString& oldText,
-                int32_t oldStart,
-                int32_t oldLength,
-                const UnicodeString& newText,
-                int32_t newStart,
-                int32_t newLength);
-
-
-  /* Remove operations */
-
-  /**
-   * Removes all characters from the UnicodeString object and clears the bogus flag.
-   * This is the UnicodeString equivalent of std::string’s clear().
-   *
-   * @return a reference to this
-   * @see setToBogus
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& remove();
-
-  /**
-   * Remove the characters in the range
-   * [`start`, `start + length`) from the UnicodeString object.
-   * @param start the offset of the first character to remove
-   * @param length the number of characters to remove
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& remove(int32_t start,
-                               int32_t length = (int32_t)INT32_MAX);
-
-  /**
-   * Remove the characters in the range
-   * [`start`, `limit`) from the UnicodeString object.
-   * @param start the offset of the first character to remove
-   * @param limit the offset immediately following the range to remove
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& removeBetween(int32_t start,
-                                      int32_t limit = (int32_t)INT32_MAX);
-
-  /**
-   * Retain only the characters in the range
-   * [`start`, `limit`) from the UnicodeString object.
-   * Removes characters before `start` and at and after `limit`.
-   * @param start the offset of the first character to retain
-   * @param limit the offset immediately following the range to retain
-   * @return a reference to this
-   * @stable ICU 4.4
-   */
-  inline UnicodeString &retainBetween(int32_t start, int32_t limit = INT32_MAX);
-
-  /* Length operations */
-
-  /**
-   * Pad the start of this UnicodeString with the character `padChar`.
-   * If the length of this UnicodeString is less than targetLength,
-   * length() - targetLength copies of padChar will be added to the
-   * beginning of this UnicodeString.
-   * @param targetLength the desired length of the string
-   * @param padChar the character to use for padding. Defaults to
-   * space (U+0020)
-   * @return TRUE if the text was padded, FALSE otherwise.
-   * @stable ICU 2.0
-   */
-  UBool padLeading(int32_t targetLength,
-                    char16_t padChar = 0x0020);
-
-  /**
-   * Pad the end of this UnicodeString with the character `padChar`.
-   * If the length of this UnicodeString is less than targetLength,
-   * length() - targetLength copies of padChar will be added to the
-   * end of this UnicodeString.
-   * @param targetLength the desired length of the string
-   * @param padChar the character to use for padding. Defaults to
-   * space (U+0020)
-   * @return TRUE if the text was padded, FALSE otherwise.
-   * @stable ICU 2.0
-   */
-  UBool padTrailing(int32_t targetLength,
-                     char16_t padChar = 0x0020);
-
-  /**
-   * Truncate this UnicodeString to the `targetLength`.
-   * @param targetLength the desired length of this UnicodeString.
-   * @return TRUE if the text was truncated, FALSE otherwise
-   * @stable ICU 2.0
-   */
-  inline UBool truncate(int32_t targetLength);
-
-  /**
-   * Trims leading and trailing whitespace from this UnicodeString.
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  UnicodeString& trim(void);
-
-
-  /* Miscellaneous operations */
-
-  /**
-   * Reverse this UnicodeString in place.
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& reverse(void);
-
-  /**
-   * Reverse the range [`start`, `start + length`) in
-   * this UnicodeString.
-   * @param start the start of the range to reverse
-   * @param length the number of characters to to reverse
-   * @return a reference to this
-   * @stable ICU 2.0
-   */
-  inline UnicodeString& reverse(int32_t start,
-             int32_t length);
-
-  /**
-   * Convert the characters in this to UPPER CASE following the conventions of
-   * the default locale.
-   * @return A reference to this.
-   * @stable ICU 2.0
-   */
-  UnicodeString& toUpper(void);
-
-  /**
-   * Convert the characters in this to UPPER CASE following the conventions of
-   * a specific locale.
-   * @param locale The locale containing the conventions to use.
-   * @return A reference to this.
-   * @stable ICU 2.0
-   */
-  UnicodeString& toUpper(const Locale& locale);
-
-  /**
-   * Convert the characters in this to lower case following the conventions of
-   * the default locale.
-   * @return A reference to this.
-   * @stable ICU 2.0
-   */
-  UnicodeString& toLower(void);
-
-  /**
-   * Convert the characters in this to lower case following the conventions of
-   * a specific locale.
-   * @param locale The locale containing the conventions to use.
-   * @return A reference to this.
-   * @stable ICU 2.0
-   */
-  UnicodeString& toLower(const Locale& locale);
-
-#if !UCONFIG_NO_BREAK_ITERATION
-
-  /**
-   * Titlecase this string, convenience function using the default locale.
-   *
-   * Casing is locale-dependent and context-sensitive.
-   * Titlecasing uses a break iterator to find the first characters of words
-   * that are to be titlecased. It titlecases those characters and lowercases
-   * all others.
-   *
-   * The titlecase break iterator can be provided to customize for arbitrary
-   * styles, using rules and dictionaries beyond the standard iterators.
-   * It may be more efficient to always provide an iterator to avoid
-   * opening and closing one for each string.
-   * The standard titlecase iterator for the root locale implements the
-   * algorithm of Unicode TR 21.
-   *
-   * This function uses only the setText(), first() and next() methods of the
-   * provided break iterator.
-   *
-   * @param titleIter A break iterator to find the first characters of words
-   *                  that are to be titlecased.
-   *                  If none is provided (0), then a standard titlecase
-   *                  break iterator is opened.
-   *                  Otherwise the provided iterator is set to the string's text.
-   * @return A reference to this.
-   * @stable ICU 2.1
-   */
-  UnicodeString &toTitle(BreakIterator *titleIter);
-
-  /**
-   * Titlecase this string.
-   *
-   * Casing is locale-dependent and context-sensitive.
-   * Titlecasing uses a break iterator to find the first characters of words
-   * that are to be titlecased. It titlecases those characters and lowercases
-   * all others.
-   *
-   * The titlecase break iterator can be provided to customize for arbitrary
-   * styles, using rules and dictionaries beyond the standard iterators.
-   * It may be more efficient to always provide an iterator to avoid
-   * opening and closing one for each string.
-   * The standard titlecase iterator for the root locale implements the
-   * algorithm of Unicode TR 21.
-   *
-   * This function uses only the setText(), first() and next() methods of the
-   * provided break iterator.
-   *
-   * @param titleIter A break iterator to find the first characters of words
-   *                  that are to be titlecased.
-   *                  If none is provided (0), then a standard titlecase
-   *                  break iterator is opened.
-   *                  Otherwise the provided iterator is set to the string's text.
-   * @param locale    The locale to consider.
-   * @return A reference to this.
-   * @stable ICU 2.1
-   */
-  UnicodeString &toTitle(BreakIterator *titleIter, const Locale &locale);
-
-  /**
-   * Titlecase this string, with options.
-   *
-   * Casing is locale-dependent and context-sensitive.
-   * Titlecasing uses a break iterator to find the first characters of words
-   * that are to be titlecased. It titlecases those characters and lowercases
-   * all others. (This can be modified with options.)
-   *
-   * The titlecase break iterator can be provided to customize for arbitrary
-   * styles, using rules and dictionaries beyond the standard iterators.
-   * It may be more efficient to always provide an iterator to avoid
-   * opening and closing one for each string.
-   * The standard titlecase iterator for the root locale implements the
-   * algorithm of Unicode TR 21.
-   *
-   * This function uses only the setText(), first() and next() methods of the
-   * provided break iterator.
-   *
-   * @param titleIter A break iterator to find the first characters of words
-   *                  that are to be titlecased.
-   *                  If none is provided (0), then a standard titlecase
-   *                  break iterator is opened.
-   *                  Otherwise the provided iterator is set to the string's text.
-   * @param locale    The locale to consider.
-   * @param options   Options bit set, usually 0. See U_TITLECASE_NO_LOWERCASE,
-   *                  U_TITLECASE_NO_BREAK_ADJUSTMENT, U_TITLECASE_ADJUST_TO_CASED,
-   *                  U_TITLECASE_WHOLE_STRING, U_TITLECASE_SENTENCES.
-   * @param options Options bit set, see ucasemap_open().
-   * @return A reference to this.
-   * @stable ICU 3.8
-   */
-  UnicodeString &toTitle(BreakIterator *titleIter, const Locale &locale, uint32_t options);
-
-#endif
-
-  /**
-   * Case-folds the characters in this string.
-   *
-   * Case-folding is locale-independent and not context-sensitive,
-   * but there is an option for whether to include or exclude mappings for dotted I
-   * and dotless i that are marked with 'T' in CaseFolding.txt.
-   *
-   * The result may be longer or shorter than the original.
-   *
-   * @param options Either U_FOLD_CASE_DEFAULT or U_FOLD_CASE_EXCLUDE_SPECIAL_I
-   * @return A reference to this.
-   * @stable ICU 2.0
-   */
-  UnicodeString &foldCase(uint32_t options=0 /*U_FOLD_CASE_DEFAULT*/);
-
-  //========================================
-  // Access to the internal buffer
-  //========================================
-
-  /**
-   * Get a read/write pointer to the internal buffer.
-   * The buffer is guaranteed to be large enough for at least minCapacity char16_ts,
-   * writable, and is still owned by the UnicodeString object.
-   * Calls to getBuffer(minCapacity) must not be nested, and
-   * must be matched with calls to releaseBuffer(newLength).
-   * If the string buffer was read-only or shared,
-   * then it will be reallocated and copied.
-   *
-   * An attempted nested call will return 0, and will not further modify the
-   * state of the UnicodeString object.
-   * It also returns 0 if the string is bogus.
-   *
-   * The actual capacity of the string buffer may be larger than minCapacity.
-   * getCapacity() returns the actual capacity.
-   * For many operations, the full capacity should be used to avoid reallocations.
-   *
-   * While the buffer is "open" between getBuffer(minCapacity)
-   * and releaseBuffer(newLength), the following applies:
-   * - The string length is set to 0.
-   * - Any read API call on the UnicodeString object will behave like on a 0-length string.
-   * - Any write API call on the UnicodeString object is disallowed and will have no effect.
-   * - You can read from and write to the returned buffer.
-   * - The previous string contents will still be in the buffer;
-   *   if you want to use it, then you need to call length() before getBuffer(minCapacity).
-   *   If the length() was greater than minCapacity, then any contents after minCapacity
-   *   may be lost.
-   *   The buffer contents is not NUL-terminated by getBuffer().
-   *   If length() < getCapacity() then you can terminate it by writing a NUL
-   *   at index length().
-   * - You must call releaseBuffer(newLength) before and in order to
-   *   return to normal UnicodeString operation.
-   *
-   * @param minCapacity the minimum number of char16_ts that are to be available
-   *        in the buffer, starting at the returned pointer;
-   *        default to the current string capacity if minCapacity==-1
-   * @return a writable pointer to the internal string buffer,
-   *         or nullptr if an error occurs (nested calls, out of memory)
-   *
-   * @see releaseBuffer
-   * @see getTerminatedBuffer()
-   * @stable ICU 2.0
-   */
-  char16_t *getBuffer(int32_t minCapacity);
-
-  /**
-   * Release a read/write buffer on a UnicodeString object with an
-   * "open" getBuffer(minCapacity).
-   * This function must be called in a matched pair with getBuffer(minCapacity).
-   * releaseBuffer(newLength) must be called if and only if a getBuffer(minCapacity) is "open".
-   *
-   * It will set the string length to newLength, at most to the current capacity.
-   * If newLength==-1 then it will set the length according to the
-   * first NUL in the buffer, or to the capacity if there is no NUL.
-   *
-   * After calling releaseBuffer(newLength) the UnicodeString is back to normal operation.
-   *
-   * @param newLength the new length of the UnicodeString object;
-   *        defaults to the current capacity if newLength is greater than that;
-   *        if newLength==-1, it defaults to u_strlen(buffer) but not more than
-   *        the current capacity of the string
-   *
-   * @see getBuffer(int32_t minCapacity)
-   * @stable ICU 2.0
-   */
-  void releaseBuffer(int32_t newLength=-1);
-
-  /**
-   * Get a read-only pointer to the internal buffer.
-   * This can be called at any time on a valid UnicodeString.
-   *
-   * It returns 0 if the string is bogus, or
-   * during an "open" getBuffer(minCapacity).
-   *
-   * It can be called as many times as desired.
-   * The pointer that it returns will remain valid until the UnicodeString object is modified,
-   * at which time the pointer is semantically invalidated and must not be used any more.
-   *
-   * The capacity of the buffer can be determined with getCapacity().
-   * The part after length() may or may not be initialized and valid,
-   * depending on the history of the UnicodeString object.
-   *
-   * The buffer contents is (probably) not NUL-terminated.
-   * You can check if it is with
-   * `(s.length() < s.getCapacity() && buffer[s.length()]==0)`.
-   * (See getTerminatedBuffer().)
-   *
-   * The buffer may reside in read-only memory. Its contents must not
-   * be modified.
-   *
-   * @return a read-only pointer to the internal string buffer,
-   *         or nullptr if the string is empty or bogus
-   *
-   * @see getBuffer(int32_t minCapacity)
-   * @see getTerminatedBuffer()
-   * @stable ICU 2.0
-   */
-  inline const char16_t *getBuffer() const;
-
-  /**
-   * Get a read-only pointer to the internal buffer,
-   * making sure that it is NUL-terminated.
-   * This can be called at any time on a valid UnicodeString.
-   *
-   * It returns 0 if the string is bogus, or
-   * during an "open" getBuffer(minCapacity), or if the buffer cannot
-   * be NUL-terminated (because memory allocation failed).
-   *
-   * It can be called as many times as desired.
-   * The pointer that it returns will remain valid until the UnicodeString object is modified,
-   * at which time the pointer is semantically invalidated and must not be used any more.
-   *
-   * The capacity of the buffer can be determined with getCapacity().
-   * The part after length()+1 may or may not be initialized and valid,
-   * depending on the history of the UnicodeString object.
-   *
-   * The buffer contents is guaranteed to be NUL-terminated.
-   * getTerminatedBuffer() may reallocate the buffer if a terminating NUL
-   * is written.
-   * For this reason, this function is not const, unlike getBuffer().
-   * Note that a UnicodeString may also contain NUL characters as part of its contents.
-   *
-   * The buffer may reside in read-only memory. Its contents must not
-   * be modified.
-   *
-   * @return a read-only pointer to the internal string buffer,
-   *         or 0 if the string is empty or bogus
-   *
-   * @see getBuffer(int32_t minCapacity)
-   * @see getBuffer()
-   * @stable ICU 2.2
-   */
-  const char16_t *getTerminatedBuffer();
-
-  //========================================
-  // Constructors
-  //========================================
-
-  /** Construct an empty UnicodeString.
-   * @stable ICU 2.0
-   */
-  inline UnicodeString();
-
-  /**
-   * Construct a UnicodeString with capacity to hold `capacity` char16_ts
-   * @param capacity the number of char16_ts this UnicodeString should hold
-   * before a resize is necessary; if count is greater than 0 and count
-   * code points c take up more space than capacity, then capacity is adjusted
-   * accordingly.
-   * @param c is used to initially fill the string
-   * @param count specifies how many code points c are to be written in the
-   *              string
-   * @stable ICU 2.0
-   */
-  UnicodeString(int32_t capacity, UChar32 c, int32_t count);
-
-  /**
-   * Single char16_t (code unit) constructor.
-   *
-   * It is recommended to mark this constructor "explicit" by
-   * `-DUNISTR_FROM_CHAR_EXPLICIT=explicit`
-   * on the compiler command line or similar.
-   * @param ch the character to place in the UnicodeString
-   * @stable ICU 2.0
-   */
-  UNISTR_FROM_CHAR_EXPLICIT UnicodeString(char16_t ch);
-
-  /**
-   * Single UChar32 (code point) constructor.
-   *
-   * It is recommended to mark this constructor "explicit" by
-   * `-DUNISTR_FROM_CHAR_EXPLICIT=explicit`
-   * on the compiler command line or similar.
-   * @param ch the character to place in the UnicodeString
-   * @stable ICU 2.0
-   */
-  UNISTR_FROM_CHAR_EXPLICIT UnicodeString(UChar32 ch);
-
-  /**
-   * char16_t* constructor.
-   *
-   * It is recommended to mark this constructor "explicit" by
-   * `-DUNISTR_FROM_STRING_EXPLICIT=explicit`
-   * on the compiler command line or similar.
-   * @param text The characters to place in the UnicodeString.  `text`
-   * must be NULL (U+0000) terminated.
-   * @stable ICU 2.0
-   */
-  UNISTR_FROM_STRING_EXPLICIT UnicodeString(const char16_t *text);
-
-#if !U_CHAR16_IS_TYPEDEF
-  /**
-   * uint16_t * constructor.
-   * Delegates to UnicodeString(const char16_t *).
-   *
-   * It is recommended to mark this constructor "explicit" by
-   * `-DUNISTR_FROM_STRING_EXPLICIT=explicit`
-   * on the compiler command line or similar.
-   * @param text NUL-terminated UTF-16 string
-   * @stable ICU 59
-   */
-  UNISTR_FROM_STRING_EXPLICIT UnicodeString(const uint16_t *text) :
-      UnicodeString(ConstChar16Ptr(text)) {}
-#endif
-
-#if U_SIZEOF_WCHAR_T==2 || defined(U_IN_DOXYGEN)
-  /**
-   * wchar_t * constructor.
-   * (Only defined if U_SIZEOF_WCHAR_T==2.)
-   * Delegates to UnicodeString(const char16_t *).
-   *
-   * It is recommended to mark this constructor "explicit" by
-   * `-DUNISTR_FROM_STRING_EXPLICIT=explicit`
-   * on the compiler command line or similar.
-   * @param text NUL-terminated UTF-16 string
-   * @stable ICU 59
-   */
-  UNISTR_FROM_STRING_EXPLICIT UnicodeString(const wchar_t *text) :
-      UnicodeString(ConstChar16Ptr(text)) {}
-#endif
-
-  /**
-   * nullptr_t constructor.
-   * Effectively the same as the default constructor, makes an empty string object.
-   *
-   * It is recommended to mark this constructor "explicit" by
-   * `-DUNISTR_FROM_STRING_EXPLICIT=explicit`
-   * on the compiler command line or similar.
-   * @param text nullptr
-   * @stable ICU 59
-   */
-  UNISTR_FROM_STRING_EXPLICIT inline UnicodeString(const std::nullptr_t text);
-
-  /**
-   * char16_t* constructor.
-   * @param text The characters to place in the UnicodeString.
-   * @param textLength The number of Unicode characters in `text`
-   * to copy.
-   * @stable ICU 2.0
-   */
-  UnicodeString(const char16_t *text,
-        int32_t textLength);
-
-#if !U_CHAR16_IS_TYPEDEF
-  /**
-   * uint16_t * constructor.
-   * Delegates to UnicodeString(const char16_t *, int32_t).
-   * @param text UTF-16 string
-   * @param textLength string length
-   * @stable ICU 59
-   */
-  UnicodeString(const uint16_t *text, int32_t textLength) :
-      UnicodeString(ConstChar16Ptr(text), textLength) {}
-#endif
-
-#if U_SIZEOF_WCHAR_T==2 || defined(U_IN_DOXYGEN)
-  /**
-   * wchar_t * constructor.
-   * (Only defined if U_SIZEOF_WCHAR_T==2.)
-   * Delegates to UnicodeString(const char16_t *, int32_t).
-   * @param text NUL-terminated UTF-16 string
-   * @param textLength string length
-   * @stable ICU 59
-   */
-  UnicodeString(const wchar_t *text, int32_t textLength) :
-      UnicodeString(ConstChar16Ptr(text), textLength) {}
-#endif
-
-  /**
-   * nullptr_t constructor.
-   * Effectively the same as the default constructor, makes an empty string object.
-   * @param text nullptr
-   * @param textLength ignored
-   * @stable ICU 59
-   */
-  inline UnicodeString(const std::nullptr_t text, int32_t textLength);
-
-  /**
-   * Readonly-aliasing char16_t* constructor.
-   * The text will be used for the UnicodeString object, but
-   * it will not be released when the UnicodeString is destroyed.
-   * This has copy-on-write semantics:
-   * When the string is modified, then the buffer is first copied into
-   * newly allocated memory.
-   * The aliased buffer is never modified.
-   *
-   * In an assignment to another UnicodeString, when using the copy constructor
-   * or the assignment operator, the text will be copied.
-   * When using fastCopyFrom(), the text will be aliased again,
-   * so that both strings then alias the same readonly-text.
-   *
-   * @param isTerminated specifies if `text` is `NUL`-terminated.
-   *                     This must be true if `textLength==-1`.
-   * @param text The characters to alias for the UnicodeString.
-   * @param textLength The number of Unicode characters in `text` to alias.
-   *                   If -1, then this constructor will determine the length
-   *                   by calling `u_strlen()`.
-   * @stable ICU 2.0
-   */
-  UnicodeString(UBool isTerminated,
-                ConstChar16Ptr text,
-                int32_t textLength);
-
-  /**
-   * Writable-aliasing char16_t* constructor.
-   * The text will be used for the UnicodeString object, but
-   * it will not be released when the UnicodeString is destroyed.
-   * This has write-through semantics:
-   * For as long as the capacity of the buffer is sufficient, write operations
-   * will directly affect the buffer. When more capacity is necessary, then
-   * a new buffer will be allocated and the contents copied as with regularly
-   * constructed strings.
-   * In an assignment to another UnicodeString, the buffer will be copied.
-   * The extract(Char16Ptr dst) function detects whether the dst pointer is the same
-   * as the string buffer itself and will in this case not copy the contents.
-   *
-   * @param buffer The characters to alias for the UnicodeString.
-   * @param buffLength The number of Unicode characters in `buffer` to alias.
-   * @param buffCapacity The size of `buffer` in char16_ts.
-   * @stable ICU 2.0
-   */
-  UnicodeString(char16_t *buffer, int32_t buffLength, int32_t buffCapacity);
-
-#if !U_CHAR16_IS_TYPEDEF
-  /**
-   * Writable-aliasing uint16_t * constructor.
-   * Delegates to UnicodeString(const char16_t *, int32_t, int32_t).
-   * @param buffer writable buffer of/for UTF-16 text
-   * @param buffLength length of the current buffer contents
-   * @param buffCapacity buffer capacity
-   * @stable ICU 59
-   */
-  UnicodeString(uint16_t *buffer, int32_t buffLength, int32_t buffCapacity) :
-      UnicodeString(Char16Ptr(buffer), buffLength, buffCapacity) {}
-#endif
-
-#if U_SIZEOF_WCHAR_T==2 || defined(U_IN_DOXYGEN)
-  /**
-   * Writable-aliasing wchar_t * constructor.
-   * (Only defined if U_SIZEOF_WCHAR_T==2.)
-   * Delegates to UnicodeString(const char16_t *, int32_t, int32_t).
-   * @param buffer writable buffer of/for UTF-16 text
-   * @param buffLength length of the current buffer contents
-   * @param buffCapacity buffer capacity
-   * @stable ICU 59
-   */
-  UnicodeString(wchar_t *buffer, int32_t buffLength, int32_t buffCapacity) :
-      UnicodeString(Char16Ptr(buffer), buffLength, buffCapacity) {}
-#endif
-
-  /**
-   * Writable-aliasing nullptr_t constructor.
-   * Effectively the same as the default constructor, makes an empty string object.
-   * @param buffer nullptr
-   * @param buffLength ignored
-   * @param buffCapacity ignored
-   * @stable ICU 59
-   */
-  inline UnicodeString(std::nullptr_t buffer, int32_t buffLength, int32_t buffCapacity);
-
-#if U_CHARSET_IS_UTF8 || !UCONFIG_NO_CONVERSION
-
-  /**
-   * char* constructor.
-   * Uses the default converter (and thus depends on the ICU conversion code)
-   * unless U_CHARSET_IS_UTF8 is set to 1.
-   *
-   * For ASCII (really "invariant character") strings it is more efficient to use
-   * the constructor that takes a US_INV (for its enum EInvariant).
-   * For ASCII (invariant-character) string literals, see UNICODE_STRING and
-   * UNICODE_STRING_SIMPLE.
-   *
-   * It is recommended to mark this constructor "explicit" by
-   * `-DUNISTR_FROM_STRING_EXPLICIT=explicit`
-   * on the compiler command line or similar.
-   * @param codepageData an array of bytes, null-terminated,
-   *                     in the platform's default codepage.
-   * @stable ICU 2.0
-   * @see UNICODE_STRING
-   * @see UNICODE_STRING_SIMPLE
-   */
-  UNISTR_FROM_STRING_EXPLICIT UnicodeString(const char *codepageData);
-
-  /**
-   * char* constructor.
-   * Uses the default converter (and thus depends on the ICU conversion code)
-   * unless U_CHARSET_IS_UTF8 is set to 1.
-   * @param codepageData an array of bytes in the platform's default codepage.
-   * @param dataLength The number of bytes in `codepageData`.
-   * @stable ICU 2.0
-   */
-  UnicodeString(const char *codepageData, int32_t dataLength);
-
-#endif
-
-#if !UCONFIG_NO_CONVERSION
-
-  /**
-   * char* constructor.
-   * @param codepageData an array of bytes, null-terminated
-   * @param codepage the encoding of `codepageData`.  The special
-   * value 0 for `codepage` indicates that the text is in the
-   * platform's default codepage.
-   *
-   * If `codepage` is an empty string (`""`),
-   * then a simple conversion is performed on the codepage-invariant
-   * subset ("invariant characters") of the platform encoding. See utypes.h.
-   * Recommendation: For invariant-character strings use the constructor
-   * UnicodeString(const char *src, int32_t length, enum EInvariant inv)
-   * because it avoids object code dependencies of UnicodeString on
-   * the conversion code.
-   *
-   * @stable ICU 2.0
-   */
-  UnicodeString(const char *codepageData, const char *codepage);
-
-  /**
-   * char* constructor.
-   * @param codepageData an array of bytes.
-   * @param dataLength The number of bytes in `codepageData`.
-   * @param codepage the encoding of `codepageData`.  The special
-   * value 0 for `codepage` indicates that the text is in the
-   * platform's default codepage.
-   * If `codepage` is an empty string (`""`),
-   * then a simple conversion is performed on the codepage-invariant
-   * subset ("invariant characters") of the platform encoding. See utypes.h.
-   * Recommendation: For invariant-character strings use the constructor
-   * UnicodeString(const char *src, int32_t length, enum EInvariant inv)
-   * because it avoids object code dependencies of UnicodeString on
-   * the conversion code.
-   *
-   * @stable ICU 2.0
-   */
-  UnicodeString(const char *codepageData, int32_t dataLength, const char *codepage);
-
-  /**
-   * char * / UConverter constructor.
-   * This constructor uses an existing UConverter object to
-   * convert the codepage string to Unicode and construct a UnicodeString
-   * from that.
-   *
-   * The converter is reset at first.
-   * If the error code indicates a failure before this constructor is called,
-   * or if an error occurs during conversion or construction,
-   * then the string will be bogus.
-   *
-   * This function avoids the overhead of opening and closing a converter if
-   * multiple strings are constructed.
-   *
-   * @param src input codepage string
-   * @param srcLength length of the input string, can be -1 for NUL-terminated strings
-   * @param cnv converter object (ucnv_resetToUnicode() will be called),
-   *        can be NULL for the default converter
-   * @param errorCode normal ICU error code
-   * @stable ICU 2.0
-   */
-  UnicodeString(
-        const char *src, int32_t srcLength,
-        UConverter *cnv,
-        UErrorCode &errorCode);
-
-#endif
-
-  /**
-   * Constructs a Unicode string from an invariant-character char * string.
-   * About invariant characters see utypes.h.
-   * This constructor has no runtime dependency on conversion code and is
-   * therefore recommended over ones taking a charset name string
-   * (where the empty string "" indicates invariant-character conversion).
-   *
-   * Use the macro US_INV as the third, signature-distinguishing parameter.
-   *
-   * For example:
-   * \code
-   *     void fn(const char *s) {
-   *       UnicodeString ustr(s, -1, US_INV);
-   *       // use ustr ...
-   *     }
-   * \endcode
-   * @param src String using only invariant characters.
-   * @param textLength Length of src, or -1 if NUL-terminated.
-   * @param inv Signature-distinguishing paramater, use US_INV.
-   *
-   * @see US_INV
-   * @stable ICU 3.2
-   */
-  UnicodeString(const char *src, int32_t textLength, enum EInvariant inv);
-
-
-  /**
-   * Copy constructor.
-   *
-   * Starting with ICU 2.4, the assignment operator and the copy constructor
-   * allocate a new buffer and copy the buffer contents even for readonly aliases.
-   * By contrast, the fastCopyFrom() function implements the old,
-   * more efficient but less safe behavior
-   * of making this string also a readonly alias to the same buffer.
-   *
-   * If the source object has an "open" buffer from getBuffer(minCapacity),
-   * then the copy is an empty string.
-   *
-   * @param that The UnicodeString object to copy.
-   * @stable ICU 2.0
-   * @see fastCopyFrom
-   */
-  UnicodeString(const UnicodeString& that);
-
-  /**
-   * Move constructor; might leave src in bogus state.
-   * This string will have the same contents and state that the source string had.
-   * @param src source string
-   * @stable ICU 56
-   */
-  UnicodeString(UnicodeString &&src) U_NOEXCEPT;
-
-  /**
-   * 'Substring' constructor from tail of source string.
-   * @param src The UnicodeString object to copy.
-   * @param srcStart The offset into `src` at which to start copying.
-   * @stable ICU 2.2
-   */
-  UnicodeString(const UnicodeString& src, int32_t srcStart);
-
-  /**
-   * 'Substring' constructor from subrange of source string.
-   * @param src The UnicodeString object to copy.
-   * @param srcStart The offset into `src` at which to start copying.
-   * @param srcLength The number of characters from `src` to copy.
-   * @stable ICU 2.2
-   */
-  UnicodeString(const UnicodeString& src, int32_t srcStart, int32_t srcLength);
-
-  /**
-   * Clone this object, an instance of a subclass of Replaceable.
-   * Clones can be used concurrently in multiple threads.
-   * If a subclass does not implement clone(), or if an error occurs,
-   * then NULL is returned.
-   * The caller must delete the clone.
-   *
-   * @return a clone of this object
-   *
-   * @see Replaceable::clone
-   * @see getDynamicClassID
-   * @stable ICU 2.6
-   */
-  virtual UnicodeString *clone() const;
-
-  /** Destructor.
-   * @stable ICU 2.0
-   */
-  virtual ~UnicodeString();
-
-  /**
-   * Create a UnicodeString from a UTF-8 string.
-   * Illegal input is replaced with U+FFFD. Otherwise, errors result in a bogus string.
-   * Calls u_strFromUTF8WithSub().
-   *
-   * @param utf8 UTF-8 input string.
-   *             Note that a StringPiece can be implicitly constructed
-   *             from a std::string or a NUL-terminated const char * string.
-   * @return A UnicodeString with equivalent UTF-16 contents.
-   * @see toUTF8
-   * @see toUTF8String
-   * @stable ICU 4.2
-   */
-  static UnicodeString fromUTF8(StringPiece utf8);
-
-  /**
-   * Create a UnicodeString from a UTF-32 string.
-   * Illegal input is replaced with U+FFFD. Otherwise, errors result in a bogus string.
-   * Calls u_strFromUTF32WithSub().
-   *
-   * @param utf32 UTF-32 input string. Must not be NULL.
-   * @param length Length of the input string, or -1 if NUL-terminated.
-   * @return A UnicodeString with equivalent UTF-16 contents.
-   * @see toUTF32
-   * @stable ICU 4.2
-   */
-  static UnicodeString fromUTF32(const UChar32 *utf32, int32_t length);
-
-  /* Miscellaneous operations */
-
-  /**
-   * Unescape a string of characters and return a string containing
-   * the result.  The following escape sequences are recognized:
-   *
-   * \\uhhhh       4 hex digits; h in [0-9A-Fa-f]
-   * \\Uhhhhhhhh   8 hex digits
-   * \\xhh         1-2 hex digits
-   * \\ooo         1-3 octal digits; o in [0-7]
-   * \\cX          control-X; X is masked with 0x1F
-   *
-   * as well as the standard ANSI C escapes:
-   *
-   * \\a => U+0007, \\b => U+0008, \\t => U+0009, \\n => U+000A,
-   * \\v => U+000B, \\f => U+000C, \\r => U+000D, \\e => U+001B,
-   * \\" => U+0022, \\' => U+0027, \\? => U+003F, \\\\ => U+005C
-   *
-   * Anything else following a backslash is generically escaped.  For
-   * example, "[a\\-z]" returns "[a-z]".
-   *
-   * If an escape sequence is ill-formed, this method returns an empty
-   * string.  An example of an ill-formed sequence is "\\u" followed by
-   * fewer than 4 hex digits.
-   *
-   * This function is similar to u_unescape() but not identical to it.
-   * The latter takes a source char*, so it does escape recognition
-   * and also invariant conversion.
-   *
-   * @return a string with backslash escapes interpreted, or an
-   * empty string on error.
-   * @see UnicodeString#unescapeAt()
-   * @see u_unescape()
-   * @see u_unescapeAt()
-   * @stable ICU 2.0
-   */
-  UnicodeString unescape() const;
-
-  /**
-   * Unescape a single escape sequence and return the represented
-   * character.  See unescape() for a listing of the recognized escape
-   * sequences.  The character at offset-1 is assumed (without
-   * checking) to be a backslash.  If the escape sequence is
-   * ill-formed, or the offset is out of range, U_SENTINEL=-1 is
-   * returned.
-   *
-   * @param offset an input output parameter.  On input, it is the
-   * offset into this string where the escape sequence is located,
-   * after the initial backslash.  On output, it is advanced after the
-   * last character parsed.  On error, it is not advanced at all.
-   * @return the character represented by the escape sequence at
-   * offset, or U_SENTINEL=-1 on error.
-   * @see UnicodeString#unescape()
-   * @see u_unescape()
-   * @see u_unescapeAt()
-   * @stable ICU 2.0
-   */
-  UChar32 unescapeAt(int32_t &offset) const;
-
-  /**
-   * ICU "poor man's RTTI", returns a UClassID for this class.
-   *
-   * @stable ICU 2.2
-   */
-  static UClassID U_EXPORT2 getStaticClassID();
-
-  /**
-   * ICU "poor man's RTTI", returns a UClassID for the actual class.
-   *
-   * @stable ICU 2.2
-   */
-  virtual UClassID getDynamicClassID() const;
-
-  //========================================
-  // Implementation methods
-  //========================================
-
-protected:
-  /**
-   * Implement Replaceable::getLength() (see jitterbug 1027).
-   * @stable ICU 2.4
-   */
-  virtual int32_t getLength() const;
-
-  /**
-   * The change in Replaceable to use virtual getCharAt() allows
-   * UnicodeString::charAt() to be inline again (see jitterbug 709).
-   * @stable ICU 2.4
-   */
-  virtual char16_t getCharAt(int32_t offset) const;
-
-  /**
-   * The change in Replaceable to use virtual getChar32At() allows
-   * UnicodeString::char32At() to be inline again (see jitterbug 709).
-   * @stable ICU 2.4
-   */
-  virtual UChar32 getChar32At(int32_t offset) const;
-
-private:
-  // For char* constructors. Could be made public.
-  UnicodeString &setToUTF8(StringPiece utf8);
-  // For extract(char*).
-  // We could make a toUTF8(target, capacity, errorCode) public but not
-  // this version: New API will be cleaner if we make callers create substrings
-  // rather than having start+length on every method,
-  // and it should take a UErrorCode&.
-  int32_t
-  toUTF8(int32_t start, int32_t len,
-         char *target, int32_t capacity) const;
-
-  /**
-   * Internal string contents comparison, called by operator==.
-   * Requires: this & text not bogus and have same lengths.
-   */
-  UBool doEquals(const UnicodeString &text, int32_t len) const;
-
-  inline int8_t
-  doCompare(int32_t start,
-           int32_t length,
-           const UnicodeString& srcText,
-           int32_t srcStart,
-           int32_t srcLength) const;
-
-  int8_t doCompare(int32_t start,
-           int32_t length,
-           const char16_t *srcChars,
-           int32_t srcStart,
-           int32_t srcLength) const;
-
-  inline int8_t
-  doCompareCodePointOrder(int32_t start,
-                          int32_t length,
-                          const UnicodeString& srcText,
-                          int32_t srcStart,
-                          int32_t srcLength) const;
-
-  int8_t doCompareCodePointOrder(int32_t start,
-                                 int32_t length,
-                                 const char16_t *srcChars,
-                                 int32_t srcStart,
-                                 int32_t srcLength) const;
-
-  inline int8_t
-  doCaseCompare(int32_t start,
-                int32_t length,
-                const UnicodeString &srcText,
-                int32_t srcStart,
-                int32_t srcLength,
-                uint32_t options) const;
-
-  int8_t
-  doCaseCompare(int32_t start,
-                int32_t length,
-                const char16_t *srcChars,
-                int32_t srcStart,
-                int32_t srcLength,
-                uint32_t options) const;
-
-  int32_t doIndexOf(char16_t c,
-            int32_t start,
-            int32_t length) const;
-
-  int32_t doIndexOf(UChar32 c,
-                        int32_t start,
-                        int32_t length) const;
-
-  int32_t doLastIndexOf(char16_t c,
-                int32_t start,
-                int32_t length) const;
-
-  int32_t doLastIndexOf(UChar32 c,
-                            int32_t start,
-                            int32_t length) const;
-
-  void doExtract(int32_t start,
-         int32_t length,
-         char16_t *dst,
-         int32_t dstStart) const;
-
-  inline void doExtract(int32_t start,
-         int32_t length,
-         UnicodeString& target) const;
-
-  inline char16_t doCharAt(int32_t offset)  const;
-
-  UnicodeString& doReplace(int32_t start,
-               int32_t length,
-               const UnicodeString& srcText,
-               int32_t srcStart,
-               int32_t srcLength);
-
-  UnicodeString& doReplace(int32_t start,
-               int32_t length,
-               const char16_t *srcChars,
-               int32_t srcStart,
-               int32_t srcLength);
-
-  UnicodeString& doAppend(const UnicodeString& src, int32_t srcStart, int32_t srcLength);
-  UnicodeString& doAppend(const char16_t *srcChars, int32_t srcStart, int32_t srcLength);
-
-  UnicodeString& doReverse(int32_t start,
-               int32_t length);
-
-  // calculate hash code
-  int32_t doHashCode(void) const;
-
-  // get pointer to start of array
-  // these do not check for kOpenGetBuffer, unlike the public getBuffer() function
-  inline char16_t* getArrayStart(void);
-  inline const char16_t* getArrayStart(void) const;
-
-  inline UBool hasShortLength() const;
-  inline int32_t getShortLength() const;
-
-  // A UnicodeString object (not necessarily its current buffer)
-  // is writable unless it isBogus() or it has an "open" getBuffer(minCapacity).
-  inline UBool isWritable() const;
-
-  // Is the current buffer writable?
-  inline UBool isBufferWritable() const;
-
-  // None of the following does releaseArray().
-  inline void setZeroLength();
-  inline void setShortLength(int32_t len);
-  inline void setLength(int32_t len);
-  inline void setToEmpty();
-  inline void setArray(char16_t *array, int32_t len, int32_t capacity); // sets length but not flags
-
-  // allocate the array; result may be the stack buffer
-  // sets refCount to 1 if appropriate
-  // sets fArray, fCapacity, and flags
-  // sets length to 0
-  // returns boolean for success or failure
-  UBool allocate(int32_t capacity);
-
-  // release the array if owned
-  void releaseArray(void);
-
-  // turn a bogus string into an empty one
-  void unBogus();
-
-  // implements assigment operator, copy constructor, and fastCopyFrom()
-  UnicodeString &copyFrom(const UnicodeString &src, UBool fastCopy=FALSE);
-
-  // Copies just the fields without memory management.
-  void copyFieldsFrom(UnicodeString &src, UBool setSrcToBogus) U_NOEXCEPT;
-
-  // Pin start and limit to acceptable values.
-  inline void pinIndex(int32_t& start) const;
-  inline void pinIndices(int32_t& start,
-                         int32_t& length) const;
-
-#if !UCONFIG_NO_CONVERSION
-
-  /* Internal extract() using UConverter. */
-  int32_t doExtract(int32_t start, int32_t length,
-                    char *dest, int32_t destCapacity,
-                    UConverter *cnv,
-                    UErrorCode &errorCode) const;
-
-  /*
-   * Real constructor for converting from codepage data.
-   * It assumes that it is called with !fRefCounted.
-   *
-   * If `codepage==0`, then the default converter
-   * is used for the platform encoding.
-   * If `codepage` is an empty string (`""`),
-   * then a simple conversion is performed on the codepage-invariant
-   * subset ("invariant characters") of the platform encoding. See utypes.h.
-   */
-  void doCodepageCreate(const char *codepageData,
-                        int32_t dataLength,
-                        const char *codepage);
-
-  /*
-   * Worker function for creating a UnicodeString from
-   * a codepage string using a UConverter.
-   */
-  void
-  doCodepageCreate(const char *codepageData,
-                   int32_t dataLength,
-                   UConverter *converter,
-                   UErrorCode &status);
-
-#endif
-
-  /*
-   * This function is called when write access to the array
-   * is necessary.
-   *
-   * We need to make a copy of the array if
-   * the buffer is read-only, or
-   * the buffer is refCounted (shared), and refCount>1, or
-   * the buffer is too small.
-   *
-   * Return FALSE if memory could not be allocated.
-   */
-  UBool cloneArrayIfNeeded(int32_t newCapacity = -1,
-                            int32_t growCapacity = -1,
-                            UBool doCopyArray = TRUE,
-                            int32_t **pBufferToDelete = 0,
-                            UBool forceClone = FALSE);
-
-  /**
-   * Common function for UnicodeString case mappings.
-   * The stringCaseMapper has the same type UStringCaseMapper
-   * as in ustr_imp.h for ustrcase_map().
-   */
-  UnicodeString &
-  caseMap(int32_t caseLocale, uint32_t options,
-#if !UCONFIG_NO_BREAK_ITERATION
-          BreakIterator *iter,
-#endif
-          UStringCaseMapper *stringCaseMapper);
-
-  // ref counting
-  void addRef(void);
-  int32_t removeRef(void);
-  int32_t refCount(void) const;
-
-  // constants
-  enum {
-    /**
-     * Size of stack buffer for short strings.
-     * Must be at least U16_MAX_LENGTH for the single-code point constructor to work.
-     * @see UNISTR_OBJECT_SIZE
-     */
-    US_STACKBUF_SIZE=(int32_t)(UNISTR_OBJECT_SIZE-sizeof(void *)-2)/U_SIZEOF_UCHAR,
-    kInvalidUChar=0xffff, // U+FFFF returned by charAt(invalid index)
-    kInvalidHashCode=0, // invalid hash code
-    kEmptyHashCode=1, // hash code for empty string
-
-    // bit flag values for fLengthAndFlags
-    kIsBogus=1,         // this string is bogus, i.e., not valid or NULL
-    kUsingStackBuffer=2,// using fUnion.fStackFields instead of fUnion.fFields
-    kRefCounted=4,      // there is a refCount field before the characters in fArray
-    kBufferIsReadonly=8,// do not write to this buffer
-    kOpenGetBuffer=16,  // getBuffer(minCapacity) was called (is "open"),
-                        // and releaseBuffer(newLength) must be called
-    kAllStorageFlags=0x1f,
-
-    kLengthShift=5,     // remaining 11 bits for non-negative short length, or negative if long
-    kLength1=1<<kLengthShift,
-    kMaxShortLength=0x3ff,  // max non-negative short length (leaves top bit 0)
-    kLengthIsLarge=0xffe0,  // short length < 0, real length is in fUnion.fFields.fLength
-
-    // combined values for convenience
-    kShortString=kUsingStackBuffer,
-    kLongString=kRefCounted,
-    kReadonlyAlias=kBufferIsReadonly,
-    kWritableAlias=0
-  };
-
-  friend class UnicodeStringAppendable;
-
-  union StackBufferOrFields;        // forward declaration necessary before friend declaration
-  friend union StackBufferOrFields; // make US_STACKBUF_SIZE visible inside fUnion
-
-  /*
-   * The following are all the class fields that are stored
-   * in each UnicodeString object.
-   * Note that UnicodeString has virtual functions,
-   * therefore there is an implicit vtable pointer
-   * as the first real field.
-   * The fields should be aligned such that no padding is necessary.
-   * On 32-bit machines, the size should be 32 bytes,
-   * on 64-bit machines (8-byte pointers), it should be 40 bytes.
-   *
-   * We use a hack to achieve this.
-   *
-   * With at least some compilers, each of the following is forced to
-   * a multiple of sizeof(pointer) [the largest field base unit here is a data pointer],
-   * rounded up with additional padding if the fields do not already fit that requirement:
-   * - sizeof(class UnicodeString)
-   * - offsetof(UnicodeString, fUnion)
-   * - sizeof(fUnion)
-   * - sizeof(fStackFields)
-   *
-   * We optimize for the longest possible internal buffer for short strings.
-   * fUnion.fStackFields begins with 2 bytes for storage flags
-   * and the length of relatively short strings,
-   * followed by the buffer for short string contents.
-   * There is no padding inside fStackFields.
-   *
-   * Heap-allocated and aliased strings use fUnion.fFields.
-   * Both fStackFields and fFields must begin with the same fields for flags and short length,
-   * that is, those must have the same memory offsets inside the object,
-   * because the flags must be inspected in order to decide which half of fUnion is being used.
-   * We assume that the compiler does not reorder the fields.
-   *
-   * (Padding at the end of fFields is ok:
-   * As long as it is no larger than fStackFields, it is not wasted space.)
-   *
-   * For some of the history of the UnicodeString class fields layout, see
-   * - ICU ticket #11551 "longer UnicodeString contents in stack buffer"
-   * - ICU ticket #11336 "UnicodeString: recombine stack buffer arrays"
-   * - ICU ticket #8322 "why is sizeof(UnicodeString)==48?"
-   */
-  // (implicit) *vtable;
-  union StackBufferOrFields {
-    // fStackFields is used iff (fLengthAndFlags&kUsingStackBuffer) else fFields is used.
-    // Each struct of the union must begin with fLengthAndFlags.
-    struct {
-      int16_t fLengthAndFlags;          // bit fields: see constants above
-      char16_t fBuffer[US_STACKBUF_SIZE];  // buffer for short strings
-    } fStackFields;
-    struct {
-      int16_t fLengthAndFlags;          // bit fields: see constants above
-      int32_t fLength;    // number of characters in fArray if >127; else undefined
-      int32_t fCapacity;  // capacity of fArray (in char16_ts)
-      // array pointer last to minimize padding for machines with P128 data model
-      // or pointer sizes that are not a power of 2
-      char16_t   *fArray;    // the Unicode data
-    } fFields;
-  } fUnion;
-};
-
-/**
- * Create a new UnicodeString with the concatenation of two others.
- *
- * @param s1 The first string to be copied to the new one.
- * @param s2 The second string to be copied to the new one, after s1.
- * @return UnicodeString(s1).append(s2)
- * @stable ICU 2.8
- */
-U_COMMON_API UnicodeString U_EXPORT2
-operator+ (const UnicodeString &s1, const UnicodeString &s2);
-
-//========================================
-// Inline members
-//========================================
-
-//========================================
-// Privates
-//========================================
-
-inline void
-UnicodeString::pinIndex(int32_t& start) const
-{
-  // pin index
-  if(start < 0) {
-    start = 0;
-  } else if(start > length()) {
-    start = length();
-  }
-}
-
-inline void
-UnicodeString::pinIndices(int32_t& start,
-                          int32_t& _length) const
-{
-  // pin indices
-  int32_t len = length();
-  if(start < 0) {
-    start = 0;
-  } else if(start > len) {
-    start = len;
-  }
-  if(_length < 0) {
-    _length = 0;
-  } else if(_length > (len - start)) {
-    _length = (len - start);
-  }
-}
-
-inline char16_t*
-UnicodeString::getArrayStart() {
-  return (fUnion.fFields.fLengthAndFlags&kUsingStackBuffer) ?
-    fUnion.fStackFields.fBuffer : fUnion.fFields.fArray;
-}
-
-inline const char16_t*
-UnicodeString::getArrayStart() const {
-  return (fUnion.fFields.fLengthAndFlags&kUsingStackBuffer) ?
-    fUnion.fStackFields.fBuffer : fUnion.fFields.fArray;
-}
-
-//========================================
-// Default constructor
-//========================================
-
-inline
-UnicodeString::UnicodeString() {
-  fUnion.fStackFields.fLengthAndFlags=kShortString;
-}
-
-inline UnicodeString::UnicodeString(const std::nullptr_t /*text*/) {
-  fUnion.fStackFields.fLengthAndFlags=kShortString;
-}
-
-inline UnicodeString::UnicodeString(const std::nullptr_t /*text*/, int32_t /*length*/) {
-  fUnion.fStackFields.fLengthAndFlags=kShortString;
-}
-
-inline UnicodeString::UnicodeString(std::nullptr_t /*buffer*/, int32_t /*buffLength*/, int32_t /*buffCapacity*/) {
-  fUnion.fStackFields.fLengthAndFlags=kShortString;
-}
-
-//========================================
-// Read-only implementation methods
-//========================================
-inline UBool
-UnicodeString::hasShortLength() const {
-  return fUnion.fFields.fLengthAndFlags>=0;
-}
-
-inline int32_t
-UnicodeString::getShortLength() const {
-  // fLengthAndFlags must be non-negative -> short length >= 0
-  // and arithmetic or logical shift does not matter.
-  return fUnion.fFields.fLengthAndFlags>>kLengthShift;
-}
-
-inline int32_t
-UnicodeString::length() const {
-  return hasShortLength() ? getShortLength() : fUnion.fFields.fLength;
-}
-
-inline int32_t
-UnicodeString::getCapacity() const {
-  return (fUnion.fFields.fLengthAndFlags&kUsingStackBuffer) ?
-    US_STACKBUF_SIZE : fUnion.fFields.fCapacity;
-}
-
-inline int32_t
-UnicodeString::hashCode() const
-{ return doHashCode(); }
-
-inline UBool
-UnicodeString::isBogus() const
-{ return (UBool)(fUnion.fFields.fLengthAndFlags & kIsBogus); }
-
-inline UBool
-UnicodeString::isWritable() const
-{ return (UBool)!(fUnion.fFields.fLengthAndFlags&(kOpenGetBuffer|kIsBogus)); }
-
-inline UBool
-UnicodeString::isBufferWritable() const
-{
-  return (UBool)(
-      !(fUnion.fFields.fLengthAndFlags&(kOpenGetBuffer|kIsBogus|kBufferIsReadonly)) &&
-      (!(fUnion.fFields.fLengthAndFlags&kRefCounted) || refCount()==1));
-}
-
-inline const char16_t *
-UnicodeString::getBuffer() const {
-  if(fUnion.fFields.fLengthAndFlags&(kIsBogus|kOpenGetBuffer)) {
-    return nullptr;
-  } else if(fUnion.fFields.fLengthAndFlags&kUsingStackBuffer) {
-    return fUnion.fStackFields.fBuffer;
-  } else {
-    return fUnion.fFields.fArray;
-  }
-}
-
-//========================================
-// Read-only alias methods
-//========================================
-inline int8_t
-UnicodeString::doCompare(int32_t start,
-              int32_t thisLength,
-              const UnicodeString& srcText,
-              int32_t srcStart,
-              int32_t srcLength) const
-{
-  if(srcText.isBogus()) {
-    return (int8_t)!isBogus(); // 0 if both are bogus, 1 otherwise
-  } else {
-    srcText.pinIndices(srcStart, srcLength);
-    return doCompare(start, thisLength, srcText.getArrayStart(), srcStart, srcLength);
-  }
-}
-
-inline UBool
-UnicodeString::operator== (const UnicodeString& text) const
-{
-  if(isBogus()) {
-    return text.isBogus();
-  } else {
-    int32_t len = length(), textLength = text.length();
-    return !text.isBogus() && len == textLength && doEquals(text, len);
-  }
-}
-
-inline UBool
-UnicodeString::operator!= (const UnicodeString& text) const
-{ return (! operator==(text)); }
-
-inline UBool
-UnicodeString::operator> (const UnicodeString& text) const
-{ return doCompare(0, length(), text, 0, text.length()) == 1; }
-
-inline UBool
-UnicodeString::operator< (const UnicodeString& text) const
-{ return doCompare(0, length(), text, 0, text.length()) == -1; }
-
-inline UBool
-UnicodeString::operator>= (const UnicodeString& text) const
-{ return doCompare(0, length(), text, 0, text.length()) != -1; }
-
-inline UBool
-UnicodeString::operator<= (const UnicodeString& text) const
-{ return doCompare(0, length(), text, 0, text.length()) != 1; }
-
-inline int8_t
-UnicodeString::compare(const UnicodeString& text) const
-{ return doCompare(0, length(), text, 0, text.length()); }
-
-inline int8_t
-UnicodeString::compare(int32_t start,
-               int32_t _length,
-               const UnicodeString& srcText) const
-{ return doCompare(start, _length, srcText, 0, srcText.length()); }
-
-inline int8_t
-UnicodeString::compare(ConstChar16Ptr srcChars,
-               int32_t srcLength) const
-{ return doCompare(0, length(), srcChars, 0, srcLength); }
-
-inline int8_t
-UnicodeString::compare(int32_t start,
-               int32_t _length,
-               const UnicodeString& srcText,
-               int32_t srcStart,
-               int32_t srcLength) const
-{ return doCompare(start, _length, srcText, srcStart, srcLength); }
-
-inline int8_t
-UnicodeString::compare(int32_t start,
-               int32_t _length,
-               const char16_t *srcChars) const
-{ return doCompare(start, _length, srcChars, 0, _length); }
-
-inline int8_t
-UnicodeString::compare(int32_t start,
-               int32_t _length,
-               const char16_t *srcChars,
-               int32_t srcStart,
-               int32_t srcLength) const
-{ return doCompare(start, _length, srcChars, srcStart, srcLength); }
-
-inline int8_t
-UnicodeString::compareBetween(int32_t start,
-                  int32_t limit,
-                  const UnicodeString& srcText,
-                  int32_t srcStart,
-                  int32_t srcLimit) const
-{ return doCompare(start, limit - start,
-           srcText, srcStart, srcLimit - srcStart); }
-
-inline int8_t
-UnicodeString::doCompareCodePointOrder(int32_t start,
-                                       int32_t thisLength,
-                                       const UnicodeString& srcText,
-                                       int32_t srcStart,
-                                       int32_t srcLength) const
-{
-  if(srcText.isBogus()) {
-    return (int8_t)!isBogus(); // 0 if both are bogus, 1 otherwise
-  } else {
-    srcText.pinIndices(srcStart, srcLength);
-    return doCompareCodePointOrder(start, thisLength, srcText.getArrayStart(), srcStart, srcLength);
-  }
-}
-
-inline int8_t
-UnicodeString::compareCodePointOrder(const UnicodeString& text) const
-{ return doCompareCodePointOrder(0, length(), text, 0, text.length()); }
-
-inline int8_t
-UnicodeString::compareCodePointOrder(int32_t start,
-                                     int32_t _length,
-                                     const UnicodeString& srcText) const
-{ return doCompareCodePointOrder(start, _length, srcText, 0, srcText.length()); }
-
-inline int8_t
-UnicodeString::compareCodePointOrder(ConstChar16Ptr srcChars,
-                                     int32_t srcLength) const
-{ return doCompareCodePointOrder(0, length(), srcChars, 0, srcLength); }
-
-inline int8_t
-UnicodeString::compareCodePointOrder(int32_t start,
-                                     int32_t _length,
-                                     const UnicodeString& srcText,
-                                     int32_t srcStart,
-                                     int32_t srcLength) const
-{ return doCompareCodePointOrder(start, _length, srcText, srcStart, srcLength); }
-
-inline int8_t
-UnicodeString::compareCodePointOrder(int32_t start,
-                                     int32_t _length,
-                                     const char16_t *srcChars) const
-{ return doCompareCodePointOrder(start, _length, srcChars, 0, _length); }
-
-inline int8_t
-UnicodeString::compareCodePointOrder(int32_t start,
-                                     int32_t _length,
-                                     const char16_t *srcChars,
-                                     int32_t srcStart,
-                                     int32_t srcLength) const
-{ return doCompareCodePointOrder(start, _length, srcChars, srcStart, srcLength); }
-
-inline int8_t
-UnicodeString::compareCodePointOrderBetween(int32_t start,
-                                            int32_t limit,
-                                            const UnicodeString& srcText,
-                                            int32_t srcStart,
-                                            int32_t srcLimit) const
-{ return doCompareCodePointOrder(start, limit - start,
-           srcText, srcStart, srcLimit - srcStart); }
-
-inline int8_t
-UnicodeString::doCaseCompare(int32_t start,
-                             int32_t thisLength,
-                             const UnicodeString &srcText,
-                             int32_t srcStart,
-                             int32_t srcLength,
-                             uint32_t options) const
-{
-  if(srcText.isBogus()) {
-    return (int8_t)!isBogus(); // 0 if both are bogus, 1 otherwise
-  } else {
-    srcText.pinIndices(srcStart, srcLength);
-    return doCaseCompare(start, thisLength, srcText.getArrayStart(), srcStart, srcLength, options);
-  }
-}
-
-inline int8_t
-UnicodeString::caseCompare(const UnicodeString &text, uint32_t options) const {
-  return doCaseCompare(0, length(), text, 0, text.length(), options);
-}
-
-inline int8_t
-UnicodeString::caseCompare(int32_t start,
-                           int32_t _length,
-                           const UnicodeString &srcText,
-                           uint32_t options) const {
-  return doCaseCompare(start, _length, srcText, 0, srcText.length(), options);
-}
-
-inline int8_t
-UnicodeString::caseCompare(ConstChar16Ptr srcChars,
-                           int32_t srcLength,
-                           uint32_t options) const {
-  return doCaseCompare(0, length(), srcChars, 0, srcLength, options);
-}
-
-inline int8_t
-UnicodeString::caseCompare(int32_t start,
-                           int32_t _length,
-                           const UnicodeString &srcText,
-                           int32_t srcStart,
-                           int32_t srcLength,
-                           uint32_t options) const {
-  return doCaseCompare(start, _length, srcText, srcStart, srcLength, options);
-}
-
-inline int8_t
-UnicodeString::caseCompare(int32_t start,
-                           int32_t _length,
-                           const char16_t *srcChars,
-                           uint32_t options) const {
-  return doCaseCompare(start, _length, srcChars, 0, _length, options);
-}
-
-inline int8_t
-UnicodeString::caseCompare(int32_t start,
-                           int32_t _length,
-                           const char16_t *srcChars,
-                           int32_t srcStart,
-                           int32_t srcLength,
-                           uint32_t options) const {
-  return doCaseCompare(start, _length, srcChars, srcStart, srcLength, options);
-}
-
-inline int8_t
-UnicodeString::caseCompareBetween(int32_t start,
-                                  int32_t limit,
-                                  const UnicodeString &srcText,
-                                  int32_t srcStart,
-                                  int32_t srcLimit,
-                                  uint32_t options) const {
-  return doCaseCompare(start, limit - start, srcText, srcStart, srcLimit - srcStart, options);
-}
-
-inline int32_t
-UnicodeString::indexOf(const UnicodeString& srcText,
-               int32_t srcStart,
-               int32_t srcLength,
-               int32_t start,
-               int32_t _length) const
-{
-  if(!srcText.isBogus()) {
-    srcText.pinIndices(srcStart, srcLength);
-    if(srcLength > 0) {
-      return indexOf(srcText.getArrayStart(), srcStart, srcLength, start, _length);
-    }
-  }
-  return -1;
-}
-
-inline int32_t
-UnicodeString::indexOf(const UnicodeString& text) const
-{ return indexOf(text, 0, text.length(), 0, length()); }
-
-inline int32_t
-UnicodeString::indexOf(const UnicodeString& text,
-               int32_t start) const {
-  pinIndex(start);
-  return indexOf(text, 0, text.length(), start, length() - start);
-}
-
-inline int32_t
-UnicodeString::indexOf(const UnicodeString& text,
-               int32_t start,
-               int32_t _length) const
-{ return indexOf(text, 0, text.length(), start, _length); }
-
-inline int32_t
-UnicodeString::indexOf(const char16_t *srcChars,
-               int32_t srcLength,
-               int32_t start) const {
-  pinIndex(start);
-  return indexOf(srcChars, 0, srcLength, start, length() - start);
-}
-
-inline int32_t
-UnicodeString::indexOf(ConstChar16Ptr srcChars,
-               int32_t srcLength,
-               int32_t start,
-               int32_t _length) const
-{ return indexOf(srcChars, 0, srcLength, start, _length); }
-
-inline int32_t
-UnicodeString::indexOf(char16_t c,
-               int32_t start,
-               int32_t _length) const
-{ return doIndexOf(c, start, _length); }
-
-inline int32_t
-UnicodeString::indexOf(UChar32 c,
-               int32_t start,
-               int32_t _length) const
-{ return doIndexOf(c, start, _length); }
-
-inline int32_t
-UnicodeString::indexOf(char16_t c) const
-{ return doIndexOf(c, 0, length()); }
-
-inline int32_t
-UnicodeString::indexOf(UChar32 c) const
-{ return indexOf(c, 0, length()); }
-
-inline int32_t
-UnicodeString::indexOf(char16_t c,
-               int32_t start) const {
-  pinIndex(start);
-  return doIndexOf(c, start, length() - start);
-}
-
-inline int32_t
-UnicodeString::indexOf(UChar32 c,
-               int32_t start) const {
-  pinIndex(start);
-  return indexOf(c, start, length() - start);
-}
-
-inline int32_t
-UnicodeString::lastIndexOf(ConstChar16Ptr srcChars,
-               int32_t srcLength,
-               int32_t start,
-               int32_t _length) const
-{ return lastIndexOf(srcChars, 0, srcLength, start, _length); }
-
-inline int32_t
-UnicodeString::lastIndexOf(const char16_t *srcChars,
-               int32_t srcLength,
-               int32_t start) const {
-  pinIndex(start);
-  return lastIndexOf(srcChars, 0, srcLength, start, length() - start);
-}
-
-inline int32_t
-UnicodeString::lastIndexOf(const UnicodeString& srcText,
-               int32_t srcStart,
-               int32_t srcLength,
-               int32_t start,
-               int32_t _length) const
-{
-  if(!srcText.isBogus()) {
-    srcText.pinIndices(srcStart, srcLength);
-    if(srcLength > 0) {
-      return lastIndexOf(srcText.getArrayStart(), srcStart, srcLength, start, _length);
-    }
-  }
-  return -1;
-}
-
-inline int32_t
-UnicodeString::lastIndexOf(const UnicodeString& text,
-               int32_t start,
-               int32_t _length) const
-{ return lastIndexOf(text, 0, text.length(), start, _length); }
-
-inline int32_t
-UnicodeString::lastIndexOf(const UnicodeString& text,
-               int32_t start) const {
-  pinIndex(start);
-  return lastIndexOf(text, 0, text.length(), start, length() - start);
-}
-
-inline int32_t
-UnicodeString::lastIndexOf(const UnicodeString& text) const
-{ return lastIndexOf(text, 0, text.length(), 0, length()); }
-
-inline int32_t
-UnicodeString::lastIndexOf(char16_t c,
-               int32_t start,
-               int32_t _length) const
-{ return doLastIndexOf(c, start, _length); }
-
-inline int32_t
-UnicodeString::lastIndexOf(UChar32 c,
-               int32_t start,
-               int32_t _length) const {
-  return doLastIndexOf(c, start, _length);
-}
-
-inline int32_t
-UnicodeString::lastIndexOf(char16_t c) const
-{ return doLastIndexOf(c, 0, length()); }
-
-inline int32_t
-UnicodeString::lastIndexOf(UChar32 c) const {
-  return lastIndexOf(c, 0, length());
-}
-
-inline int32_t
-UnicodeString::lastIndexOf(char16_t c,
-               int32_t start) const {
-  pinIndex(start);
-  return doLastIndexOf(c, start, length() - start);
-}
-
-inline int32_t
-UnicodeString::lastIndexOf(UChar32 c,
-               int32_t start) const {
-  pinIndex(start);
-  return lastIndexOf(c, start, length() - start);
-}
-
-inline UBool
-UnicodeString::startsWith(const UnicodeString& text) const
-{ return compare(0, text.length(), text, 0, text.length()) == 0; }
-
-inline UBool
-UnicodeString::startsWith(const UnicodeString& srcText,
-              int32_t srcStart,
-              int32_t srcLength) const
-{ return doCompare(0, srcLength, srcText, srcStart, srcLength) == 0; }
-
-inline UBool
-UnicodeString::startsWith(ConstChar16Ptr srcChars, int32_t srcLength) const {
-  if(srcLength < 0) {
-    srcLength = u_strlen(toUCharPtr(srcChars));
-  }
-  return doCompare(0, srcLength, srcChars, 0, srcLength) == 0;
-}
-
-inline UBool
-UnicodeString::startsWith(const char16_t *srcChars, int32_t srcStart, int32_t srcLength) const {
-  if(srcLength < 0) {
-    srcLength = u_strlen(toUCharPtr(srcChars));
-  }
-  return doCompare(0, srcLength, srcChars, srcStart, srcLength) == 0;
-}
-
-inline UBool
-UnicodeString::endsWith(const UnicodeString& text) const
-{ return doCompare(length() - text.length(), text.length(),
-           text, 0, text.length()) == 0; }
-
-inline UBool
-UnicodeString::endsWith(const UnicodeString& srcText,
-            int32_t srcStart,
-            int32_t srcLength) const {
-  srcText.pinIndices(srcStart, srcLength);
-  return doCompare(length() - srcLength, srcLength,
-                   srcText, srcStart, srcLength) == 0;
-}
-
-inline UBool
-UnicodeString::endsWith(ConstChar16Ptr srcChars,
-            int32_t srcLength) const {
-  if(srcLength < 0) {
-    srcLength = u_strlen(toUCharPtr(srcChars));
-  }
-  return doCompare(length() - srcLength, srcLength,
-                   srcChars, 0, srcLength) == 0;
-}
-
-inline UBool
-UnicodeString::endsWith(const char16_t *srcChars,
-            int32_t srcStart,
-            int32_t srcLength) const {
-  if(srcLength < 0) {
-    srcLength = u_strlen(toUCharPtr(srcChars + srcStart));
-  }
-  return doCompare(length() - srcLength, srcLength,
-                   srcChars, srcStart, srcLength) == 0;
-}
-
-//========================================
-// replace
-//========================================
-inline UnicodeString&
-UnicodeString::replace(int32_t start,
-               int32_t _length,
-               const UnicodeString& srcText)
-{ return doReplace(start, _length, srcText, 0, srcText.length()); }
-
-inline UnicodeString&
-UnicodeString::replace(int32_t start,
-               int32_t _length,
-               const UnicodeString& srcText,
-               int32_t srcStart,
-               int32_t srcLength)
-{ return doReplace(start, _length, srcText, srcStart, srcLength); }
-
-inline UnicodeString&
-UnicodeString::replace(int32_t start,
-               int32_t _length,
-               ConstChar16Ptr srcChars,
-               int32_t srcLength)
-{ return doReplace(start, _length, srcChars, 0, srcLength); }
-
-inline UnicodeString&
-UnicodeString::replace(int32_t start,
-               int32_t _length,
-               const char16_t *srcChars,
-               int32_t srcStart,
-               int32_t srcLength)
-{ return doReplace(start, _length, srcChars, srcStart, srcLength); }
-
-inline UnicodeString&
-UnicodeString::replace(int32_t start,
-               int32_t _length,
-               char16_t srcChar)
-{ return doReplace(start, _length, &srcChar, 0, 1); }
-
-inline UnicodeString&
-UnicodeString::replaceBetween(int32_t start,
-                  int32_t limit,
-                  const UnicodeString& srcText)
-{ return doReplace(start, limit - start, srcText, 0, srcText.length()); }
-
-inline UnicodeString&
-UnicodeString::replaceBetween(int32_t start,
-                  int32_t limit,
-                  const UnicodeString& srcText,
-                  int32_t srcStart,
-                  int32_t srcLimit)
-{ return doReplace(start, limit - start, srcText, srcStart, srcLimit - srcStart); }
-
-inline UnicodeString&
-UnicodeString::findAndReplace(const UnicodeString& oldText,
-                  const UnicodeString& newText)
-{ return findAndReplace(0, length(), oldText, 0, oldText.length(),
-            newText, 0, newText.length()); }
-
-inline UnicodeString&
-UnicodeString::findAndReplace(int32_t start,
-                  int32_t _length,
-                  const UnicodeString& oldText,
-                  const UnicodeString& newText)
-{ return findAndReplace(start, _length, oldText, 0, oldText.length(),
-            newText, 0, newText.length()); }
-
-// ============================
-// extract
-// ============================
-inline void
-UnicodeString::doExtract(int32_t start,
-             int32_t _length,
-             UnicodeString& target) const
-{ target.replace(0, target.length(), *this, start, _length); }
-
-inline void
-UnicodeString::extract(int32_t start,
-               int32_t _length,
-               Char16Ptr target,
-               int32_t targetStart) const
-{ doExtract(start, _length, target, targetStart); }
-
-inline void
-UnicodeString::extract(int32_t start,
-               int32_t _length,
-               UnicodeString& target) const
-{ doExtract(start, _length, target); }
-
-#if !UCONFIG_NO_CONVERSION
-
-inline int32_t
-UnicodeString::extract(int32_t start,
-               int32_t _length,
-               char *dst,
-               const char *codepage) const
-
-{
-  // This dstSize value will be checked explicitly
-  return extract(start, _length, dst, dst!=0 ? 0xffffffff : 0, codepage);
-}
-
-#endif
-
-inline void
-UnicodeString::extractBetween(int32_t start,
-                  int32_t limit,
-                  char16_t *dst,
-                  int32_t dstStart) const {
-  pinIndex(start);
-  pinIndex(limit);
-  doExtract(start, limit - start, dst, dstStart);
-}
-
-inline UnicodeString
-UnicodeString::tempSubStringBetween(int32_t start, int32_t limit) const {
-    return tempSubString(start, limit - start);
-}
-
-inline char16_t
-UnicodeString::doCharAt(int32_t offset) const
-{
-  if((uint32_t)offset < (uint32_t)length()) {
-    return getArrayStart()[offset];
-  } else {
-    return kInvalidUChar;
-  }
-}
-
-inline char16_t
-UnicodeString::charAt(int32_t offset) const
-{ return doCharAt(offset); }
-
-inline char16_t
-UnicodeString::operator[] (int32_t offset) const
-{ return doCharAt(offset); }
-
-inline UBool
-UnicodeString::isEmpty() const {
-  // Arithmetic or logical right shift does not matter: only testing for 0.
-  return (fUnion.fFields.fLengthAndFlags>>kLengthShift) == 0;
-}
-
-//========================================
-// Write implementation methods
-//========================================
-inline void
-UnicodeString::setZeroLength() {
-  fUnion.fFields.fLengthAndFlags &= kAllStorageFlags;
-}
-
-inline void
-UnicodeString::setShortLength(int32_t len) {
-  // requires 0 <= len <= kMaxShortLength
-  fUnion.fFields.fLengthAndFlags =
-    (int16_t)((fUnion.fFields.fLengthAndFlags & kAllStorageFlags) | (len << kLengthShift));
-}
-
-inline void
-UnicodeString::setLength(int32_t len) {
-  if(len <= kMaxShortLength) {
-    setShortLength(len);
-  } else {
-    fUnion.fFields.fLengthAndFlags |= kLengthIsLarge;
-    fUnion.fFields.fLength = len;
-  }
-}
-
-inline void
-UnicodeString::setToEmpty() {
-  fUnion.fFields.fLengthAndFlags = kShortString;
-}
-
-inline void
-UnicodeString::setArray(char16_t *array, int32_t len, int32_t capacity) {
-  setLength(len);
-  fUnion.fFields.fArray = array;
-  fUnion.fFields.fCapacity = capacity;
-}
-
-inline UnicodeString&
-UnicodeString::operator= (char16_t ch)
-{ return doReplace(0, length(), &ch, 0, 1); }
-
-inline UnicodeString&
-UnicodeString::operator= (UChar32 ch)
-{ return replace(0, length(), ch); }
-
-inline UnicodeString&
-UnicodeString::setTo(const UnicodeString& srcText,
-             int32_t srcStart,
-             int32_t srcLength)
-{
-  unBogus();
-  return doReplace(0, length(), srcText, srcStart, srcLength);
-}
-
-inline UnicodeString&
-UnicodeString::setTo(const UnicodeString& srcText,
-             int32_t srcStart)
-{
-  unBogus();
-  srcText.pinIndex(srcStart);
-  return doReplace(0, length(), srcText, srcStart, srcText.length() - srcStart);
-}
-
-inline UnicodeString&
-UnicodeString::setTo(const UnicodeString& srcText)
-{
-  return copyFrom(srcText);
-}
-
-inline UnicodeString&
-UnicodeString::setTo(const char16_t *srcChars,
-             int32_t srcLength)
-{
-  unBogus();
-  return doReplace(0, length(), srcChars, 0, srcLength);
-}
-
-inline UnicodeString&
-UnicodeString::setTo(char16_t srcChar)
-{
-  unBogus();
-  return doReplace(0, length(), &srcChar, 0, 1);
-}
-
-inline UnicodeString&
-UnicodeString::setTo(UChar32 srcChar)
-{
-  unBogus();
-  return replace(0, length(), srcChar);
-}
-
-inline UnicodeString&
-UnicodeString::append(const UnicodeString& srcText,
-              int32_t srcStart,
-              int32_t srcLength)
-{ return doAppend(srcText, srcStart, srcLength); }
-
-inline UnicodeString&
-UnicodeString::append(const UnicodeString& srcText)
-{ return doAppend(srcText, 0, srcText.length()); }
-
-inline UnicodeString&
-UnicodeString::append(const char16_t *srcChars,
-              int32_t srcStart,
-              int32_t srcLength)
-{ return doAppend(srcChars, srcStart, srcLength); }
-
-inline UnicodeString&
-UnicodeString::append(ConstChar16Ptr srcChars,
-              int32_t srcLength)
-{ return doAppend(srcChars, 0, srcLength); }
-
-inline UnicodeString&
-UnicodeString::append(char16_t srcChar)
-{ return doAppend(&srcChar, 0, 1); }
-
-inline UnicodeString&
-UnicodeString::operator+= (char16_t ch)
-{ return doAppend(&ch, 0, 1); }
-
-inline UnicodeString&
-UnicodeString::operator+= (UChar32 ch) {
-  return append(ch);
-}
-
-inline UnicodeString&
-UnicodeString::operator+= (const UnicodeString& srcText)
-{ return doAppend(srcText, 0, srcText.length()); }
-
-inline UnicodeString&
-UnicodeString::insert(int32_t start,
-              const UnicodeString& srcText,
-              int32_t srcStart,
-              int32_t srcLength)
-{ return doReplace(start, 0, srcText, srcStart, srcLength); }
-
-inline UnicodeString&
-UnicodeString::insert(int32_t start,
-              const UnicodeString& srcText)
-{ return doReplace(start, 0, srcText, 0, srcText.length()); }
-
-inline UnicodeString&
-UnicodeString::insert(int32_t start,
-              const char16_t *srcChars,
-              int32_t srcStart,
-              int32_t srcLength)
-{ return doReplace(start, 0, srcChars, srcStart, srcLength); }
-
-inline UnicodeString&
-UnicodeString::insert(int32_t start,
-              ConstChar16Ptr srcChars,
-              int32_t srcLength)
-{ return doReplace(start, 0, srcChars, 0, srcLength); }
-
-inline UnicodeString&
-UnicodeString::insert(int32_t start,
-              char16_t srcChar)
-{ return doReplace(start, 0, &srcChar, 0, 1); }
-
-inline UnicodeString&
-UnicodeString::insert(int32_t start,
-              UChar32 srcChar)
-{ return replace(start, 0, srcChar); }
-
-
-inline UnicodeString&
-UnicodeString::remove()
-{
-  // remove() of a bogus string makes the string empty and non-bogus
-  if(isBogus()) {
-    setToEmpty();
-  } else {
-    setZeroLength();
-  }
-  return *this;
-}
-
-inline UnicodeString&
-UnicodeString::remove(int32_t start,
-             int32_t _length)
-{
-    if(start <= 0 && _length == INT32_MAX) {
-        // remove(guaranteed everything) of a bogus string makes the string empty and non-bogus
-        return remove();
-    }
-    return doReplace(start, _length, NULL, 0, 0);
-}
-
-inline UnicodeString&
-UnicodeString::removeBetween(int32_t start,
-                int32_t limit)
-{ return doReplace(start, limit - start, NULL, 0, 0); }
-
-inline UnicodeString &
-UnicodeString::retainBetween(int32_t start, int32_t limit) {
-  truncate(limit);
-  return doReplace(0, start, NULL, 0, 0);
-}
-
-inline UBool
-UnicodeString::truncate(int32_t targetLength)
-{
-  if(isBogus() && targetLength == 0) {
-    // truncate(0) of a bogus string makes the string empty and non-bogus
-    unBogus();
-    return FALSE;
-  } else if((uint32_t)targetLength < (uint32_t)length()) {
-    setLength(targetLength);
-    return TRUE;
-  } else {
-    return FALSE;
-  }
-}
-
-inline UnicodeString&
-UnicodeString::reverse()
-{ return doReverse(0, length()); }
-
-inline UnicodeString&
-UnicodeString::reverse(int32_t start,
-               int32_t _length)
-{ return doReverse(start, _length); }
-
-U_NAMESPACE_END
-
-#endif /* U_SHOW_CPLUSPLUS_API */
-
-#endif