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diff --git a/include/__string/char_traits.h b/include/__string/char_traits.h
index 2660ac2..44b46eb 100644
--- a/include/__string/char_traits.h
+++ b/include/__string/char_traits.h
@@ -74,6 +74,106 @@ exposition-only to document what members a char_traits specialization should pro
};
*/
+//
+// Temporary extension to provide a base template for std::char_traits.
+// TODO(LLVM-19): Remove this class.
+//
+#if !defined(_LIBCPP_CHAR_TRAITS_REMOVE_BASE_SPECIALIZATION)
+template <class _CharT>
+struct _LIBCPP_DEPRECATED_(
+ "char_traits<T> for T not equal to char, wchar_t, char8_t, char16_t or char32_t is non-standard and is provided "
+ "for a temporary period. It will be removed in LLVM 19, so please migrate off of it.") char_traits {
+ using char_type = _CharT;
+ using int_type = int;
+ using off_type = streamoff;
+ using pos_type = streampos;
+ using state_type = mbstate_t;
+
+ static inline void _LIBCPP_CONSTEXPR_SINCE_CXX17 _LIBCPP_HIDE_FROM_ABI
+ assign(char_type& __c1, const char_type& __c2) _NOEXCEPT {
+ __c1 = __c2;
+ }
+ static inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT {
+ return __c1 == __c2;
+ }
+ static inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT {
+ return __c1 < __c2;
+ }
+
+ static _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 int
+ compare(const char_type* __s1, const char_type* __s2, size_t __n) {
+ for (; __n; --__n, ++__s1, ++__s2) {
+ if (lt(*__s1, *__s2))
+ return -1;
+ if (lt(*__s2, *__s1))
+ return 1;
+ }
+ return 0;
+ }
+ _LIBCPP_HIDE_FROM_ABI static _LIBCPP_CONSTEXPR_SINCE_CXX17 size_t length(const char_type* __s) {
+ size_t __len = 0;
+ for (; !eq(*__s, char_type(0)); ++__s)
+ ++__len;
+ return __len;
+ }
+ _LIBCPP_HIDE_FROM_ABI static _LIBCPP_CONSTEXPR_SINCE_CXX17 const char_type*
+ find(const char_type* __s, size_t __n, const char_type& __a) {
+ for (; __n; --__n) {
+ if (eq(*__s, __a))
+ return __s;
+ ++__s;
+ }
+ return nullptr;
+ }
+ static _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 char_type*
+ move(char_type* __s1, const char_type* __s2, size_t __n) {
+ if (__n == 0)
+ return __s1;
+ char_type* __r = __s1;
+ if (__s1 < __s2) {
+ for (; __n; --__n, ++__s1, ++__s2)
+ assign(*__s1, *__s2);
+ } else if (__s2 < __s1) {
+ __s1 += __n;
+ __s2 += __n;
+ for (; __n; --__n)
+ assign(*--__s1, *--__s2);
+ }
+ return __r;
+ }
+ _LIBCPP_HIDE_FROM_ABI static _LIBCPP_CONSTEXPR_SINCE_CXX20 char_type*
+ copy(char_type* __s1, const char_type* __s2, size_t __n) {
+ _LIBCPP_ASSERT_NON_OVERLAPPING_RANGES(!std::__is_pointer_in_range(__s1, __s1 + __n, __s2),
+ "char_traits::copy: source and destination ranges overlap");
+ char_type* __r = __s1;
+ for (; __n; --__n, ++__s1, ++__s2)
+ assign(*__s1, *__s2);
+ return __r;
+ }
+ _LIBCPP_HIDE_FROM_ABI static _LIBCPP_CONSTEXPR_SINCE_CXX20 char_type*
+ assign(char_type* __s, size_t __n, char_type __a) {
+ char_type* __r = __s;
+ for (; __n; --__n, ++__s)
+ assign(*__s, __a);
+ return __r;
+ }
+
+ static inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR int_type not_eof(int_type __c) _NOEXCEPT {
+ return eq_int_type(__c, eof()) ? ~eof() : __c;
+ }
+ static inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT {
+ return char_type(__c);
+ }
+ static inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR int_type to_int_type(char_type __c) _NOEXCEPT {
+ return int_type(__c);
+ }
+ static inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT {
+ return __c1 == __c2;
+ }
+ static inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR int_type eof() _NOEXCEPT { return int_type(EOF); }
+};
+#endif // !defined(_LIBCPP_CHAR_TRAITS_REMOVE_BASE_SPECIALIZATION)
+
// char_traits<char>
template <>
|
