Restoring authorship annotation for Andrey Khalyavin <halyavin@gmail.com>. Commit 1 of 2.

1 files changed, 878 insertions, 878 deletions

diff --git a/contrib/libs/cxxsupp/libcxx/include/__functional/hash.h b/contrib/libs/cxxsupp/libcxx/include/__functional/hash.h
index 728f487161..c61a2d6ea6 100644
--- a/contrib/libs/cxxsupp/libcxx/include/__functional/hash.h
+++ b/contrib/libs/cxxsupp/libcxx/include/__functional/hash.h
@@ -1,878 +1,878 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef _LIBCPP___FUNCTIONAL_HASH_H
-#define _LIBCPP___FUNCTIONAL_HASH_H
-
-#include <__config>
-#include <__functional/unary_function.h>
-#include <__tuple>
-#include <__utility/forward.h>
-#include <__utility/move.h>
-#include <__utility/pair.h>
-#include <__utility/swap.h>
-#include <cstdint>
-#include <cstring>
-#include <cstddef>
-#include <limits>
-#include <type_traits>
-
-#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
-#pragma GCC system_header
-#endif
-
-_LIBCPP_BEGIN_NAMESPACE_STD
-
-template <class _Size>
-inline _LIBCPP_INLINE_VISIBILITY
-_Size
-__loadword(const void* __p)
-{
-    _Size __r;
-    _VSTD::memcpy(&__r, __p, sizeof(__r));
-    return __r;
-}
-
-// We use murmur2 when size_t is 32 bits, and cityhash64 when size_t
-// is 64 bits.  This is because cityhash64 uses 64bit x 64bit
-// multiplication, which can be very slow on 32-bit systems.
-template <class _Size, size_t = sizeof(_Size)*__CHAR_BIT__>
-struct __murmur2_or_cityhash;
-
-template <class _Size>
-struct __murmur2_or_cityhash<_Size, 32>
-{
-    inline _Size operator()(const void* __key, _Size __len)
-         _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK;
-};
-
-// murmur2
-template <class _Size>
-_Size
-__murmur2_or_cityhash<_Size, 32>::operator()(const void* __key, _Size __len)
-{
-    const _Size __m = 0x5bd1e995;
-    const _Size __r = 24;
-    _Size __h = __len;
-    const unsigned char* __data = static_cast<const unsigned char*>(__key);
-    for (; __len >= 4; __data += 4, __len -= 4)
-    {
-        _Size __k = __loadword<_Size>(__data);
-        __k *= __m;
-        __k ^= __k >> __r;
-        __k *= __m;
-        __h *= __m;
-        __h ^= __k;
-    }
-    switch (__len)
-    {
-    case 3:
-        __h ^= static_cast<_Size>(__data[2] << 16);
-        _LIBCPP_FALLTHROUGH();
-    case 2:
-        __h ^= static_cast<_Size>(__data[1] << 8);
-        _LIBCPP_FALLTHROUGH();
-    case 1:
-        __h ^= __data[0];
-        __h *= __m;
-    }
-    __h ^= __h >> 13;
-    __h *= __m;
-    __h ^= __h >> 15;
-    return __h;
-}
-
-template <class _Size>
-struct __murmur2_or_cityhash<_Size, 64>
-{
-    inline _Size operator()(const void* __key, _Size __len)  _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK;
-
- private:
-  // Some primes between 2^63 and 2^64.
-  static const _Size __k0 = 0xc3a5c85c97cb3127ULL;
-  static const _Size __k1 = 0xb492b66fbe98f273ULL;
-  static const _Size __k2 = 0x9ae16a3b2f90404fULL;
-  static const _Size __k3 = 0xc949d7c7509e6557ULL;
-
-  static _Size __rotate(_Size __val, int __shift) {
-    return __shift == 0 ? __val : ((__val >> __shift) | (__val << (64 - __shift)));
-  }
-
-  static _Size __rotate_by_at_least_1(_Size __val, int __shift) {
-    return (__val >> __shift) | (__val << (64 - __shift));
-  }
-
-  static _Size __shift_mix(_Size __val) {
-    return __val ^ (__val >> 47);
-  }
-
-  static _Size __hash_len_16(_Size __u, _Size __v)
-     _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
-  {
-    const _Size __mul = 0x9ddfea08eb382d69ULL;
-    _Size __a = (__u ^ __v) * __mul;
-    __a ^= (__a >> 47);
-    _Size __b = (__v ^ __a) * __mul;
-    __b ^= (__b >> 47);
-    __b *= __mul;
-    return __b;
-  }
-
-  static _Size __hash_len_0_to_16(const char* __s, _Size __len)
-     _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
-  {
-    if (__len > 8) {
-      const _Size __a = __loadword<_Size>(__s);
-      const _Size __b = __loadword<_Size>(__s + __len - 8);
-      return __hash_len_16(__a, __rotate_by_at_least_1(__b + __len, __len)) ^ __b;
-    }
-    if (__len >= 4) {
-      const uint32_t __a = __loadword<uint32_t>(__s);
-      const uint32_t __b = __loadword<uint32_t>(__s + __len - 4);
-      return __hash_len_16(__len + (__a << 3), __b);
-    }
-    if (__len > 0) {
-      const unsigned char __a = static_cast<unsigned char>(__s[0]);
-      const unsigned char __b = static_cast<unsigned char>(__s[__len >> 1]);
-      const unsigned char __c = static_cast<unsigned char>(__s[__len - 1]);
-      const uint32_t __y = static_cast<uint32_t>(__a) +
-                           (static_cast<uint32_t>(__b) << 8);
-      const uint32_t __z = __len + (static_cast<uint32_t>(__c) << 2);
-      return __shift_mix(__y * __k2 ^ __z * __k3) * __k2;
-    }
-    return __k2;
-  }
-
-  static _Size __hash_len_17_to_32(const char *__s, _Size __len)
-     _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
-  {
-    const _Size __a = __loadword<_Size>(__s) * __k1;
-    const _Size __b = __loadword<_Size>(__s + 8);
-    const _Size __c = __loadword<_Size>(__s + __len - 8) * __k2;
-    const _Size __d = __loadword<_Size>(__s + __len - 16) * __k0;
-    return __hash_len_16(__rotate(__a - __b, 43) + __rotate(__c, 30) + __d,
-                         __a + __rotate(__b ^ __k3, 20) - __c + __len);
-  }
-
-  // Return a 16-byte hash for 48 bytes.  Quick and dirty.
-  // Callers do best to use "random-looking" values for a and b.
-  static pair<_Size, _Size> __weak_hash_len_32_with_seeds(
-      _Size __w, _Size __x, _Size __y, _Size __z, _Size __a, _Size __b)
-        _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
-  {
-    __a += __w;
-    __b = __rotate(__b + __a + __z, 21);
-    const _Size __c = __a;
-    __a += __x;
-    __a += __y;
-    __b += __rotate(__a, 44);
-    return pair<_Size, _Size>(__a + __z, __b + __c);
-  }
-
-  // Return a 16-byte hash for s[0] ... s[31], a, and b.  Quick and dirty.
-  static pair<_Size, _Size> __weak_hash_len_32_with_seeds(
-      const char* __s, _Size __a, _Size __b)
-    _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
-  {
-    return __weak_hash_len_32_with_seeds(__loadword<_Size>(__s),
-                                         __loadword<_Size>(__s + 8),
-                                         __loadword<_Size>(__s + 16),
-                                         __loadword<_Size>(__s + 24),
-                                         __a,
-                                         __b);
-  }
-
-  // Return an 8-byte hash for 33 to 64 bytes.
-  static _Size __hash_len_33_to_64(const char *__s, size_t __len)
-    _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
-  {
-    _Size __z = __loadword<_Size>(__s + 24);
-    _Size __a = __loadword<_Size>(__s) +
-                (__len + __loadword<_Size>(__s + __len - 16)) * __k0;
-    _Size __b = __rotate(__a + __z, 52);
-    _Size __c = __rotate(__a, 37);
-    __a += __loadword<_Size>(__s + 8);
-    __c += __rotate(__a, 7);
-    __a += __loadword<_Size>(__s + 16);
-    _Size __vf = __a + __z;
-    _Size __vs = __b + __rotate(__a, 31) + __c;
-    __a = __loadword<_Size>(__s + 16) + __loadword<_Size>(__s + __len - 32);
-    __z += __loadword<_Size>(__s + __len - 8);
-    __b = __rotate(__a + __z, 52);
-    __c = __rotate(__a, 37);
-    __a += __loadword<_Size>(__s + __len - 24);
-    __c += __rotate(__a, 7);
-    __a += __loadword<_Size>(__s + __len - 16);
-    _Size __wf = __a + __z;
-    _Size __ws = __b + __rotate(__a, 31) + __c;
-    _Size __r = __shift_mix((__vf + __ws) * __k2 + (__wf + __vs) * __k0);
-    return __shift_mix(__r * __k0 + __vs) * __k2;
-  }
-};
-
-// cityhash64
-template <class _Size>
-_Size
-__murmur2_or_cityhash<_Size, 64>::operator()(const void* __key, _Size __len)
-{
-  const char* __s = static_cast<const char*>(__key);
-  if (__len <= 32) {
-    if (__len <= 16) {
-      return __hash_len_0_to_16(__s, __len);
-    } else {
-      return __hash_len_17_to_32(__s, __len);
-    }
-  } else if (__len <= 64) {
-    return __hash_len_33_to_64(__s, __len);
-  }
-
-  // For strings over 64 bytes we hash the end first, and then as we
-  // loop we keep 56 bytes of state: v, w, x, y, and z.
-  _Size __x = __loadword<_Size>(__s + __len - 40);
-  _Size __y = __loadword<_Size>(__s + __len - 16) +
-              __loadword<_Size>(__s + __len - 56);
-  _Size __z = __hash_len_16(__loadword<_Size>(__s + __len - 48) + __len,
-                          __loadword<_Size>(__s + __len - 24));
-  pair<_Size, _Size> __v = __weak_hash_len_32_with_seeds(__s + __len - 64, __len, __z);
-  pair<_Size, _Size> __w = __weak_hash_len_32_with_seeds(__s + __len - 32, __y + __k1, __x);
-  __x = __x * __k1 + __loadword<_Size>(__s);
-
-  // Decrease len to the nearest multiple of 64, and operate on 64-byte chunks.
-  __len = (__len - 1) & ~static_cast<_Size>(63);
-  do {
-    __x = __rotate(__x + __y + __v.first + __loadword<_Size>(__s + 8), 37) * __k1;
-    __y = __rotate(__y + __v.second + __loadword<_Size>(__s + 48), 42) * __k1;
-    __x ^= __w.second;
-    __y += __v.first + __loadword<_Size>(__s + 40);
-    __z = __rotate(__z + __w.first, 33) * __k1;
-    __v = __weak_hash_len_32_with_seeds(__s, __v.second * __k1, __x + __w.first);
-    __w = __weak_hash_len_32_with_seeds(__s + 32, __z + __w.second,
-                                        __y + __loadword<_Size>(__s + 16));
-    _VSTD::swap(__z, __x);
-    __s += 64;
-    __len -= 64;
-  } while (__len != 0);
-  return __hash_len_16(
-      __hash_len_16(__v.first, __w.first) + __shift_mix(__y) * __k1 + __z,
-      __hash_len_16(__v.second, __w.second) + __x);
-}
-
-template <class _Tp, size_t = sizeof(_Tp) / sizeof(size_t)>
-struct __scalar_hash;
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <class _Tp>
-struct __scalar_hash<_Tp, 0>
-#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
-    : public unary_function<_Tp, size_t>
-#endif
-{
-_LIBCPP_SUPPRESS_DEPRECATED_POP
-#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef _Tp argument_type;
-#endif
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(_Tp __v) const _NOEXCEPT
-    {
-        union
-        {
-            _Tp    __t;
-            size_t __a;
-        } __u;
-        __u.__a = 0;
-        __u.__t = __v;
-        return __u.__a;
-    }
-};
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <class _Tp>
-struct __scalar_hash<_Tp, 1>
-#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
-    : public unary_function<_Tp, size_t>
-#endif
-{
-_LIBCPP_SUPPRESS_DEPRECATED_POP
-#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef _Tp argument_type;
-#endif
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(_Tp __v) const _NOEXCEPT
-    {
-        union
-        {
-            _Tp    __t;
-            size_t __a;
-        } __u;
-        __u.__t = __v;
-        return __u.__a;
-    }
-};
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <class _Tp>
-struct __scalar_hash<_Tp, 2>
-#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
-    : public unary_function<_Tp, size_t>
-#endif
-{
-_LIBCPP_SUPPRESS_DEPRECATED_POP
-#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef _Tp argument_type;
-#endif
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(_Tp __v) const _NOEXCEPT
-    {
-        union
-        {
-            _Tp __t;
-            struct
-            {
-                size_t __a;
-                size_t __b;
-            } __s;
-        } __u;
-        __u.__t = __v;
-        return __murmur2_or_cityhash<size_t>()(&__u, sizeof(__u));
-    }
-};
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <class _Tp>
-struct __scalar_hash<_Tp, 3>
-#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
-    : public unary_function<_Tp, size_t>
-#endif
-{
-_LIBCPP_SUPPRESS_DEPRECATED_POP
-#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef _Tp argument_type;
-#endif
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(_Tp __v) const _NOEXCEPT
-    {
-        union
-        {
-            _Tp __t;
-            struct
-            {
-                size_t __a;
-                size_t __b;
-                size_t __c;
-            } __s;
-        } __u;
-        __u.__t = __v;
-        return __murmur2_or_cityhash<size_t>()(&__u, sizeof(__u));
-    }
-};
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <class _Tp>
-struct __scalar_hash<_Tp, 4>
-#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
-    : public unary_function<_Tp, size_t>
-#endif
-{
-_LIBCPP_SUPPRESS_DEPRECATED_POP
-#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef _Tp argument_type;
-#endif
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(_Tp __v) const _NOEXCEPT
-    {
-        union
-        {
-            _Tp __t;
-            struct
-            {
-                size_t __a;
-                size_t __b;
-                size_t __c;
-                size_t __d;
-            } __s;
-        } __u;
-        __u.__t = __v;
-        return __murmur2_or_cityhash<size_t>()(&__u, sizeof(__u));
-    }
-};
-
-struct _PairT {
-  size_t first;
-  size_t second;
-};
-
-// Disable double inline warning.
-#ifdef _LIBCPP_COMPILER_MSVC
-#pragma warning ( push )
-#pragma warning ( disable : 4141 )
-#endif
-_LIBCPP_INLINE_VISIBILITY
-inline size_t __hash_combine(size_t __lhs, size_t __rhs) _NOEXCEPT {
-    typedef __scalar_hash<_PairT> _HashT;
-    const _PairT __p = {__lhs, __rhs};
-    return _HashT()(__p);
-}
-#ifdef _LIBCPP_COMPILER_MSVC
-#pragma warning ( pop )
-#endif
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template<class _Tp>
-struct _LIBCPP_TEMPLATE_VIS hash<_Tp*>
-#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
-    : public unary_function<_Tp*, size_t>
-#endif
-{
-_LIBCPP_SUPPRESS_DEPRECATED_POP
-#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef _Tp* argument_type;
-#endif
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(_Tp* __v) const _NOEXCEPT
-    {
-        union
-        {
-            _Tp* __t;
-            size_t __a;
-        } __u;
-        __u.__t = __v;
-        return __murmur2_or_cityhash<size_t>()(&__u, sizeof(__u));
-    }
-};
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <>
-struct _LIBCPP_TEMPLATE_VIS hash<bool>
-#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
-    : public unary_function<bool, size_t>
-#endif
-{
-_LIBCPP_SUPPRESS_DEPRECATED_POP
-#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef bool argument_type;
-#endif
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(bool __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
-};
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <>
-struct _LIBCPP_TEMPLATE_VIS hash<char>
-#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
-    : public unary_function<char, size_t>
-#endif
-{
-_LIBCPP_SUPPRESS_DEPRECATED_POP
-#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef char argument_type;
-#endif
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(char __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
-};
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <>
-struct _LIBCPP_TEMPLATE_VIS hash<signed char>
-#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
-    : public unary_function<signed char, size_t>
-#endif
-{
-_LIBCPP_SUPPRESS_DEPRECATED_POP
-#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef signed char argument_type;
-#endif
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(signed char __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
-};
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <>
-struct _LIBCPP_TEMPLATE_VIS hash<unsigned char>
-#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
-    : public unary_function<unsigned char, size_t>
-#endif
-{
-_LIBCPP_SUPPRESS_DEPRECATED_POP
-#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef unsigned char argument_type;
-#endif
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(unsigned char __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
-};
-
-#ifndef _LIBCPP_HAS_NO_CHAR8_T
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <>
-struct _LIBCPP_TEMPLATE_VIS hash<char8_t>
-#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
-    : public unary_function<char8_t, size_t>
-#endif
-{
-_LIBCPP_SUPPRESS_DEPRECATED_POP
-#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef char8_t argument_type;
-#endif
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(char8_t __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
-};
-#endif // !_LIBCPP_HAS_NO_CHAR8_T
-
-#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <>
-struct _LIBCPP_TEMPLATE_VIS hash<char16_t>
-#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
-    : public unary_function<char16_t, size_t>
-#endif
-{
-_LIBCPP_SUPPRESS_DEPRECATED_POP
-#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef char16_t argument_type;
-#endif
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(char16_t __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
-};
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <>
-struct _LIBCPP_TEMPLATE_VIS hash<char32_t>
-#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
-    : public unary_function<char32_t, size_t>
-#endif
-{
-_LIBCPP_SUPPRESS_DEPRECATED_POP
-#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef char32_t argument_type;
-#endif
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(char32_t __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
-};
-
-#endif // _LIBCPP_HAS_NO_UNICODE_CHARS
-
-#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <>
-struct _LIBCPP_TEMPLATE_VIS hash<wchar_t>
-#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
-    : public unary_function<wchar_t, size_t>
-#endif
-{
-_LIBCPP_SUPPRESS_DEPRECATED_POP
-#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef wchar_t argument_type;
-#endif
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(wchar_t __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
-};
-#endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <>
-struct _LIBCPP_TEMPLATE_VIS hash<short>
-#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
-    : public unary_function<short, size_t>
-#endif
-{
-_LIBCPP_SUPPRESS_DEPRECATED_POP
-#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef short argument_type;
-#endif
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(short __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
-};
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <>
-struct _LIBCPP_TEMPLATE_VIS hash<unsigned short>
-#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
-    : public unary_function<unsigned short, size_t>
-#endif
-{
-_LIBCPP_SUPPRESS_DEPRECATED_POP
-#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef unsigned short argument_type;
-#endif
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(unsigned short __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
-};
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <>
-struct _LIBCPP_TEMPLATE_VIS hash<int>
-#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
-    : public unary_function<int, size_t>
-#endif
-{
-_LIBCPP_SUPPRESS_DEPRECATED_POP
-#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef int argument_type;
-#endif
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(int __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
-};
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <>
-struct _LIBCPP_TEMPLATE_VIS hash<unsigned int>
-#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
-    : public unary_function<unsigned int, size_t>
-#endif
-{
-_LIBCPP_SUPPRESS_DEPRECATED_POP
-#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef unsigned int argument_type;
-#endif
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(unsigned int __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
-};
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <>
-struct _LIBCPP_TEMPLATE_VIS hash<long>
-#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
-    : public unary_function<long, size_t>
-#endif
-{
-_LIBCPP_SUPPRESS_DEPRECATED_POP
-#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef long argument_type;
-#endif
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(long __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
-};
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <>
-struct _LIBCPP_TEMPLATE_VIS hash<unsigned long>
-#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
-    : public unary_function<unsigned long, size_t>
-#endif
-{
-_LIBCPP_SUPPRESS_DEPRECATED_POP
-#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef unsigned long argument_type;
-#endif
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(unsigned long __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
-};
-
-template <>
-struct _LIBCPP_TEMPLATE_VIS hash<long long>
-    : public __scalar_hash<long long>
-{
-};
-
-template <>
-struct _LIBCPP_TEMPLATE_VIS hash<unsigned long long>
-    : public __scalar_hash<unsigned long long>
-{
-};
-
-#ifndef _LIBCPP_HAS_NO_INT128
-
-template <>
-struct _LIBCPP_TEMPLATE_VIS hash<__int128_t>
-    : public __scalar_hash<__int128_t>
-{
-};
-
-template <>
-struct _LIBCPP_TEMPLATE_VIS hash<__uint128_t>
-    : public __scalar_hash<__uint128_t>
-{
-};
-
-#endif
-
-template <>
-struct _LIBCPP_TEMPLATE_VIS hash<float>
-    : public __scalar_hash<float>
-{
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(float __v) const _NOEXCEPT
-    {
-        // -0.0 and 0.0 should return same hash
-       if (__v == 0.0f)
-           return 0;
-        return __scalar_hash<float>::operator()(__v);
-    }
-};
-
-template <>
-struct _LIBCPP_TEMPLATE_VIS hash<double>
-    : public __scalar_hash<double>
-{
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(double __v) const _NOEXCEPT
-    {
-        // -0.0 and 0.0 should return same hash
-       if (__v == 0.0)
-           return 0;
-        return __scalar_hash<double>::operator()(__v);
-    }
-};
-
-template <>
-struct _LIBCPP_TEMPLATE_VIS hash<long double>
-    : public __scalar_hash<long double>
-{
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(long double __v) const _NOEXCEPT
-    {
-        // -0.0 and 0.0 should return same hash
-        if (__v == 0.0L)
-            return 0;
-#if defined(__i386__) || (defined(__x86_64__) && defined(__ILP32__))
-        // Zero out padding bits
-        union
-        {
-            long double __t;
-            struct
-            {
-                size_t __a;
-                size_t __b;
-                size_t __c;
-                size_t __d;
-            } __s;
-        } __u;
-        __u.__s.__a = 0;
-        __u.__s.__b = 0;
-        __u.__s.__c = 0;
-        __u.__s.__d = 0;
-        __u.__t = __v;
-        return __u.__s.__a ^ __u.__s.__b ^ __u.__s.__c ^ __u.__s.__d;
-#elif defined(__x86_64__)
-        // Zero out padding bits
-        union
-        {
-            long double __t;
-            struct
-            {
-                size_t __a;
-                size_t __b;
-            } __s;
-        } __u;
-        __u.__s.__a = 0;
-        __u.__s.__b = 0;
-        __u.__t = __v;
-        return __u.__s.__a ^ __u.__s.__b;
-#else
-        return __scalar_hash<long double>::operator()(__v);
-#endif
-    }
-};
-
-#if _LIBCPP_STD_VER > 11
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <class _Tp, bool = is_enum<_Tp>::value>
-struct _LIBCPP_TEMPLATE_VIS __enum_hash
-#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
-    : public unary_function<_Tp, size_t>
-#endif
-{
-_LIBCPP_SUPPRESS_DEPRECATED_POP
-#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef _Tp argument_type;
-#endif
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(_Tp __v) const _NOEXCEPT
-    {
-        typedef typename underlying_type<_Tp>::type type;
-        return hash<type>{}(static_cast<type>(__v));
-    }
-};
-template <class _Tp>
-struct _LIBCPP_TEMPLATE_VIS __enum_hash<_Tp, false> {
-    __enum_hash() = delete;
-    __enum_hash(__enum_hash const&) = delete;
-    __enum_hash& operator=(__enum_hash const&) = delete;
-};
-
-template <class _Tp>
-struct _LIBCPP_TEMPLATE_VIS hash : public __enum_hash<_Tp>
-{
-};
-#endif
-
-#if _LIBCPP_STD_VER > 14
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <>
-struct _LIBCPP_TEMPLATE_VIS hash<nullptr_t>
-#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
-  : public unary_function<nullptr_t, size_t>
-#endif
-{
-_LIBCPP_SUPPRESS_DEPRECATED_POP
-#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
-    _LIBCPP_DEPRECATED_IN_CXX17 typedef nullptr_t argument_type;
-#endif
-    _LIBCPP_INLINE_VISIBILITY
-    size_t operator()(nullptr_t) const _NOEXCEPT {
-        return 662607004ull;
-    }
-};
-#endif
-
-#ifndef _LIBCPP_CXX03_LANG
-template <class _Key, class _Hash>
-using __check_hash_requirements _LIBCPP_NODEBUG = integral_constant<bool,
-    is_copy_constructible<_Hash>::value &&
-    is_move_constructible<_Hash>::value &&
-    __invokable_r<size_t, _Hash, _Key const&>::value
->;
-
-template <class _Key, class _Hash = hash<_Key> >
-using __has_enabled_hash _LIBCPP_NODEBUG = integral_constant<bool,
-    __check_hash_requirements<_Key, _Hash>::value &&
-    is_default_constructible<_Hash>::value
->;
-
-#if _LIBCPP_STD_VER > 14
-template <class _Type, class>
-using __enable_hash_helper_imp _LIBCPP_NODEBUG = _Type;
-
-template <class _Type, class ..._Keys>
-using __enable_hash_helper _LIBCPP_NODEBUG = __enable_hash_helper_imp<_Type,
-  typename enable_if<__all<__has_enabled_hash<_Keys>::value...>::value>::type
->;
-#else
-template <class _Type, class ...>
-using __enable_hash_helper _LIBCPP_NODEBUG = _Type;
-#endif
-
-#endif // !_LIBCPP_CXX03_LANG
-
-_LIBCPP_END_NAMESPACE_STD
-
-#endif // _LIBCPP___FUNCTIONAL_HASH_H
+//===----------------------------------------------------------------------===// 
+// 
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 
+// See https://llvm.org/LICENSE.txt for license information. 
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 
+// 
+//===----------------------------------------------------------------------===// 
+ 
+#ifndef _LIBCPP___FUNCTIONAL_HASH_H 
+#define _LIBCPP___FUNCTIONAL_HASH_H 
+ 
+#include <__config> 
+#include <__functional/unary_function.h> 
+#include <__tuple> 
+#include <__utility/forward.h> 
+#include <__utility/move.h> 
+#include <__utility/pair.h> 
+#include <__utility/swap.h> 
+#include <cstdint> 
+#include <cstring> 
+#include <cstddef> 
+#include <limits> 
+#include <type_traits> 
+ 
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 
+#pragma GCC system_header 
+#endif 
+ 
+_LIBCPP_BEGIN_NAMESPACE_STD 
+ 
+template <class _Size> 
+inline _LIBCPP_INLINE_VISIBILITY 
+_Size 
+__loadword(const void* __p) 
+{ 
+    _Size __r; 
+    _VSTD::memcpy(&__r, __p, sizeof(__r)); 
+    return __r; 
+} 
+ 
+// We use murmur2 when size_t is 32 bits, and cityhash64 when size_t 
+// is 64 bits.  This is because cityhash64 uses 64bit x 64bit 
+// multiplication, which can be very slow on 32-bit systems. 
+template <class _Size, size_t = sizeof(_Size)*__CHAR_BIT__> 
+struct __murmur2_or_cityhash; 
+ 
+template <class _Size> 
+struct __murmur2_or_cityhash<_Size, 32> 
+{ 
+    inline _Size operator()(const void* __key, _Size __len) 
+         _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK; 
+}; 
+ 
+// murmur2 
+template <class _Size> 
+_Size 
+__murmur2_or_cityhash<_Size, 32>::operator()(const void* __key, _Size __len) 
+{ 
+    const _Size __m = 0x5bd1e995; 
+    const _Size __r = 24; 
+    _Size __h = __len; 
+    const unsigned char* __data = static_cast<const unsigned char*>(__key); 
+    for (; __len >= 4; __data += 4, __len -= 4) 
+    { 
+        _Size __k = __loadword<_Size>(__data); 
+        __k *= __m; 
+        __k ^= __k >> __r; 
+        __k *= __m; 
+        __h *= __m; 
+        __h ^= __k; 
+    } 
+    switch (__len) 
+    { 
+    case 3: 
+        __h ^= static_cast<_Size>(__data[2] << 16); 
+        _LIBCPP_FALLTHROUGH(); 
+    case 2: 
+        __h ^= static_cast<_Size>(__data[1] << 8); 
+        _LIBCPP_FALLTHROUGH(); 
+    case 1: 
+        __h ^= __data[0]; 
+        __h *= __m; 
+    } 
+    __h ^= __h >> 13; 
+    __h *= __m; 
+    __h ^= __h >> 15; 
+    return __h; 
+} 
+ 
+template <class _Size> 
+struct __murmur2_or_cityhash<_Size, 64> 
+{ 
+    inline _Size operator()(const void* __key, _Size __len)  _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK; 
+ 
+ private: 
+  // Some primes between 2^63 and 2^64. 
+  static const _Size __k0 = 0xc3a5c85c97cb3127ULL; 
+  static const _Size __k1 = 0xb492b66fbe98f273ULL; 
+  static const _Size __k2 = 0x9ae16a3b2f90404fULL; 
+  static const _Size __k3 = 0xc949d7c7509e6557ULL; 
+ 
+  static _Size __rotate(_Size __val, int __shift) { 
+    return __shift == 0 ? __val : ((__val >> __shift) | (__val << (64 - __shift))); 
+  } 
+ 
+  static _Size __rotate_by_at_least_1(_Size __val, int __shift) { 
+    return (__val >> __shift) | (__val << (64 - __shift)); 
+  } 
+ 
+  static _Size __shift_mix(_Size __val) { 
+    return __val ^ (__val >> 47); 
+  } 
+ 
+  static _Size __hash_len_16(_Size __u, _Size __v) 
+     _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK 
+  { 
+    const _Size __mul = 0x9ddfea08eb382d69ULL; 
+    _Size __a = (__u ^ __v) * __mul; 
+    __a ^= (__a >> 47); 
+    _Size __b = (__v ^ __a) * __mul; 
+    __b ^= (__b >> 47); 
+    __b *= __mul; 
+    return __b; 
+  } 
+ 
+  static _Size __hash_len_0_to_16(const char* __s, _Size __len) 
+     _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK 
+  { 
+    if (__len > 8) { 
+      const _Size __a = __loadword<_Size>(__s); 
+      const _Size __b = __loadword<_Size>(__s + __len - 8); 
+      return __hash_len_16(__a, __rotate_by_at_least_1(__b + __len, __len)) ^ __b; 
+    } 
+    if (__len >= 4) { 
+      const uint32_t __a = __loadword<uint32_t>(__s); 
+      const uint32_t __b = __loadword<uint32_t>(__s + __len - 4); 
+      return __hash_len_16(__len + (__a << 3), __b); 
+    } 
+    if (__len > 0) { 
+      const unsigned char __a = static_cast<unsigned char>(__s[0]); 
+      const unsigned char __b = static_cast<unsigned char>(__s[__len >> 1]); 
+      const unsigned char __c = static_cast<unsigned char>(__s[__len - 1]); 
+      const uint32_t __y = static_cast<uint32_t>(__a) + 
+                           (static_cast<uint32_t>(__b) << 8); 
+      const uint32_t __z = __len + (static_cast<uint32_t>(__c) << 2); 
+      return __shift_mix(__y * __k2 ^ __z * __k3) * __k2; 
+    } 
+    return __k2; 
+  } 
+ 
+  static _Size __hash_len_17_to_32(const char *__s, _Size __len) 
+     _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK 
+  { 
+    const _Size __a = __loadword<_Size>(__s) * __k1; 
+    const _Size __b = __loadword<_Size>(__s + 8); 
+    const _Size __c = __loadword<_Size>(__s + __len - 8) * __k2; 
+    const _Size __d = __loadword<_Size>(__s + __len - 16) * __k0; 
+    return __hash_len_16(__rotate(__a - __b, 43) + __rotate(__c, 30) + __d, 
+                         __a + __rotate(__b ^ __k3, 20) - __c + __len); 
+  } 
+ 
+  // Return a 16-byte hash for 48 bytes.  Quick and dirty. 
+  // Callers do best to use "random-looking" values for a and b. 
+  static pair<_Size, _Size> __weak_hash_len_32_with_seeds( 
+      _Size __w, _Size __x, _Size __y, _Size __z, _Size __a, _Size __b) 
+        _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK 
+  { 
+    __a += __w; 
+    __b = __rotate(__b + __a + __z, 21); 
+    const _Size __c = __a; 
+    __a += __x; 
+    __a += __y; 
+    __b += __rotate(__a, 44); 
+    return pair<_Size, _Size>(__a + __z, __b + __c); 
+  } 
+ 
+  // Return a 16-byte hash for s[0] ... s[31], a, and b.  Quick and dirty. 
+  static pair<_Size, _Size> __weak_hash_len_32_with_seeds( 
+      const char* __s, _Size __a, _Size __b) 
+    _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK 
+  { 
+    return __weak_hash_len_32_with_seeds(__loadword<_Size>(__s), 
+                                         __loadword<_Size>(__s + 8), 
+                                         __loadword<_Size>(__s + 16), 
+                                         __loadword<_Size>(__s + 24), 
+                                         __a, 
+                                         __b); 
+  } 
+ 
+  // Return an 8-byte hash for 33 to 64 bytes. 
+  static _Size __hash_len_33_to_64(const char *__s, size_t __len) 
+    _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK 
+  { 
+    _Size __z = __loadword<_Size>(__s + 24); 
+    _Size __a = __loadword<_Size>(__s) + 
+                (__len + __loadword<_Size>(__s + __len - 16)) * __k0; 
+    _Size __b = __rotate(__a + __z, 52); 
+    _Size __c = __rotate(__a, 37); 
+    __a += __loadword<_Size>(__s + 8); 
+    __c += __rotate(__a, 7); 
+    __a += __loadword<_Size>(__s + 16); 
+    _Size __vf = __a + __z; 
+    _Size __vs = __b + __rotate(__a, 31) + __c; 
+    __a = __loadword<_Size>(__s + 16) + __loadword<_Size>(__s + __len - 32); 
+    __z += __loadword<_Size>(__s + __len - 8); 
+    __b = __rotate(__a + __z, 52); 
+    __c = __rotate(__a, 37); 
+    __a += __loadword<_Size>(__s + __len - 24); 
+    __c += __rotate(__a, 7); 
+    __a += __loadword<_Size>(__s + __len - 16); 
+    _Size __wf = __a + __z; 
+    _Size __ws = __b + __rotate(__a, 31) + __c; 
+    _Size __r = __shift_mix((__vf + __ws) * __k2 + (__wf + __vs) * __k0); 
+    return __shift_mix(__r * __k0 + __vs) * __k2; 
+  } 
+}; 
+ 
+// cityhash64 
+template <class _Size> 
+_Size 
+__murmur2_or_cityhash<_Size, 64>::operator()(const void* __key, _Size __len) 
+{ 
+  const char* __s = static_cast<const char*>(__key); 
+  if (__len <= 32) { 
+    if (__len <= 16) { 
+      return __hash_len_0_to_16(__s, __len); 
+    } else { 
+      return __hash_len_17_to_32(__s, __len); 
+    } 
+  } else if (__len <= 64) { 
+    return __hash_len_33_to_64(__s, __len); 
+  } 
+ 
+  // For strings over 64 bytes we hash the end first, and then as we 
+  // loop we keep 56 bytes of state: v, w, x, y, and z. 
+  _Size __x = __loadword<_Size>(__s + __len - 40); 
+  _Size __y = __loadword<_Size>(__s + __len - 16) + 
+              __loadword<_Size>(__s + __len - 56); 
+  _Size __z = __hash_len_16(__loadword<_Size>(__s + __len - 48) + __len, 
+                          __loadword<_Size>(__s + __len - 24)); 
+  pair<_Size, _Size> __v = __weak_hash_len_32_with_seeds(__s + __len - 64, __len, __z); 
+  pair<_Size, _Size> __w = __weak_hash_len_32_with_seeds(__s + __len - 32, __y + __k1, __x); 
+  __x = __x * __k1 + __loadword<_Size>(__s); 
+ 
+  // Decrease len to the nearest multiple of 64, and operate on 64-byte chunks. 
+  __len = (__len - 1) & ~static_cast<_Size>(63); 
+  do { 
+    __x = __rotate(__x + __y + __v.first + __loadword<_Size>(__s + 8), 37) * __k1; 
+    __y = __rotate(__y + __v.second + __loadword<_Size>(__s + 48), 42) * __k1; 
+    __x ^= __w.second; 
+    __y += __v.first + __loadword<_Size>(__s + 40); 
+    __z = __rotate(__z + __w.first, 33) * __k1; 
+    __v = __weak_hash_len_32_with_seeds(__s, __v.second * __k1, __x + __w.first); 
+    __w = __weak_hash_len_32_with_seeds(__s + 32, __z + __w.second, 
+                                        __y + __loadword<_Size>(__s + 16)); 
+    _VSTD::swap(__z, __x); 
+    __s += 64; 
+    __len -= 64; 
+  } while (__len != 0); 
+  return __hash_len_16( 
+      __hash_len_16(__v.first, __w.first) + __shift_mix(__y) * __k1 + __z, 
+      __hash_len_16(__v.second, __w.second) + __x); 
+} 
+ 
+template <class _Tp, size_t = sizeof(_Tp) / sizeof(size_t)> 
+struct __scalar_hash; 
+ 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH 
+template <class _Tp> 
+struct __scalar_hash<_Tp, 0> 
+#if !defined(_LIBCPP_ABI_NO_BINDER_BASES) 
+    : public unary_function<_Tp, size_t> 
+#endif 
+{ 
+_LIBCPP_SUPPRESS_DEPRECATED_POP 
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type; 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef _Tp argument_type; 
+#endif 
+    _LIBCPP_INLINE_VISIBILITY 
+    size_t operator()(_Tp __v) const _NOEXCEPT 
+    { 
+        union 
+        { 
+            _Tp    __t; 
+            size_t __a; 
+        } __u; 
+        __u.__a = 0; 
+        __u.__t = __v; 
+        return __u.__a; 
+    } 
+}; 
+ 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH 
+template <class _Tp> 
+struct __scalar_hash<_Tp, 1> 
+#if !defined(_LIBCPP_ABI_NO_BINDER_BASES) 
+    : public unary_function<_Tp, size_t> 
+#endif 
+{ 
+_LIBCPP_SUPPRESS_DEPRECATED_POP 
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type; 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef _Tp argument_type; 
+#endif 
+    _LIBCPP_INLINE_VISIBILITY 
+    size_t operator()(_Tp __v) const _NOEXCEPT 
+    { 
+        union 
+        { 
+            _Tp    __t; 
+            size_t __a; 
+        } __u; 
+        __u.__t = __v; 
+        return __u.__a; 
+    } 
+}; 
+ 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH 
+template <class _Tp> 
+struct __scalar_hash<_Tp, 2> 
+#if !defined(_LIBCPP_ABI_NO_BINDER_BASES) 
+    : public unary_function<_Tp, size_t> 
+#endif 
+{ 
+_LIBCPP_SUPPRESS_DEPRECATED_POP 
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type; 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef _Tp argument_type; 
+#endif 
+    _LIBCPP_INLINE_VISIBILITY 
+    size_t operator()(_Tp __v) const _NOEXCEPT 
+    { 
+        union 
+        { 
+            _Tp __t; 
+            struct 
+            { 
+                size_t __a; 
+                size_t __b; 
+            } __s; 
+        } __u; 
+        __u.__t = __v; 
+        return __murmur2_or_cityhash<size_t>()(&__u, sizeof(__u)); 
+    } 
+}; 
+ 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH 
+template <class _Tp> 
+struct __scalar_hash<_Tp, 3> 
+#if !defined(_LIBCPP_ABI_NO_BINDER_BASES) 
+    : public unary_function<_Tp, size_t> 
+#endif 
+{ 
+_LIBCPP_SUPPRESS_DEPRECATED_POP 
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type; 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef _Tp argument_type; 
+#endif 
+    _LIBCPP_INLINE_VISIBILITY 
+    size_t operator()(_Tp __v) const _NOEXCEPT 
+    { 
+        union 
+        { 
+            _Tp __t; 
+            struct 
+            { 
+                size_t __a; 
+                size_t __b; 
+                size_t __c; 
+            } __s; 
+        } __u; 
+        __u.__t = __v; 
+        return __murmur2_or_cityhash<size_t>()(&__u, sizeof(__u)); 
+    } 
+}; 
+ 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH 
+template <class _Tp> 
+struct __scalar_hash<_Tp, 4> 
+#if !defined(_LIBCPP_ABI_NO_BINDER_BASES) 
+    : public unary_function<_Tp, size_t> 
+#endif 
+{ 
+_LIBCPP_SUPPRESS_DEPRECATED_POP 
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type; 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef _Tp argument_type; 
+#endif 
+    _LIBCPP_INLINE_VISIBILITY 
+    size_t operator()(_Tp __v) const _NOEXCEPT 
+    { 
+        union 
+        { 
+            _Tp __t; 
+            struct 
+            { 
+                size_t __a; 
+                size_t __b; 
+                size_t __c; 
+                size_t __d; 
+            } __s; 
+        } __u; 
+        __u.__t = __v; 
+        return __murmur2_or_cityhash<size_t>()(&__u, sizeof(__u)); 
+    } 
+}; 
+ 
+struct _PairT { 
+  size_t first; 
+  size_t second; 
+}; 
+ 
+// Disable double inline warning. 
+#ifdef _LIBCPP_COMPILER_MSVC 
+#pragma warning ( push ) 
+#pragma warning ( disable : 4141 ) 
+#endif 
+_LIBCPP_INLINE_VISIBILITY 
+inline size_t __hash_combine(size_t __lhs, size_t __rhs) _NOEXCEPT { 
+    typedef __scalar_hash<_PairT> _HashT; 
+    const _PairT __p = {__lhs, __rhs}; 
+    return _HashT()(__p); 
+} 
+#ifdef _LIBCPP_COMPILER_MSVC 
+#pragma warning ( pop ) 
+#endif 
+ 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH 
+template<class _Tp> 
+struct _LIBCPP_TEMPLATE_VIS hash<_Tp*> 
+#if !defined(_LIBCPP_ABI_NO_BINDER_BASES) 
+    : public unary_function<_Tp*, size_t> 
+#endif 
+{ 
+_LIBCPP_SUPPRESS_DEPRECATED_POP 
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type; 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef _Tp* argument_type; 
+#endif 
+    _LIBCPP_INLINE_VISIBILITY 
+    size_t operator()(_Tp* __v) const _NOEXCEPT 
+    { 
+        union 
+        { 
+            _Tp* __t; 
+            size_t __a; 
+        } __u; 
+        __u.__t = __v; 
+        return __murmur2_or_cityhash<size_t>()(&__u, sizeof(__u)); 
+    } 
+}; 
+ 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH 
+template <> 
+struct _LIBCPP_TEMPLATE_VIS hash<bool> 
+#if !defined(_LIBCPP_ABI_NO_BINDER_BASES) 
+    : public unary_function<bool, size_t> 
+#endif 
+{ 
+_LIBCPP_SUPPRESS_DEPRECATED_POP 
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type; 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef bool argument_type; 
+#endif 
+    _LIBCPP_INLINE_VISIBILITY 
+    size_t operator()(bool __v) const _NOEXCEPT {return static_cast<size_t>(__v);} 
+}; 
+ 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH 
+template <> 
+struct _LIBCPP_TEMPLATE_VIS hash<char> 
+#if !defined(_LIBCPP_ABI_NO_BINDER_BASES) 
+    : public unary_function<char, size_t> 
+#endif 
+{ 
+_LIBCPP_SUPPRESS_DEPRECATED_POP 
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type; 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef char argument_type; 
+#endif 
+    _LIBCPP_INLINE_VISIBILITY 
+    size_t operator()(char __v) const _NOEXCEPT {return static_cast<size_t>(__v);} 
+}; 
+ 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH 
+template <> 
+struct _LIBCPP_TEMPLATE_VIS hash<signed char> 
+#if !defined(_LIBCPP_ABI_NO_BINDER_BASES) 
+    : public unary_function<signed char, size_t> 
+#endif 
+{ 
+_LIBCPP_SUPPRESS_DEPRECATED_POP 
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type; 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef signed char argument_type; 
+#endif 
+    _LIBCPP_INLINE_VISIBILITY 
+    size_t operator()(signed char __v) const _NOEXCEPT {return static_cast<size_t>(__v);} 
+}; 
+ 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH 
+template <> 
+struct _LIBCPP_TEMPLATE_VIS hash<unsigned char> 
+#if !defined(_LIBCPP_ABI_NO_BINDER_BASES) 
+    : public unary_function<unsigned char, size_t> 
+#endif 
+{ 
+_LIBCPP_SUPPRESS_DEPRECATED_POP 
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type; 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef unsigned char argument_type; 
+#endif 
+    _LIBCPP_INLINE_VISIBILITY 
+    size_t operator()(unsigned char __v) const _NOEXCEPT {return static_cast<size_t>(__v);} 
+}; 
+ 
+#ifndef _LIBCPP_HAS_NO_CHAR8_T 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH 
+template <> 
+struct _LIBCPP_TEMPLATE_VIS hash<char8_t> 
+#if !defined(_LIBCPP_ABI_NO_BINDER_BASES) 
+    : public unary_function<char8_t, size_t> 
+#endif 
+{ 
+_LIBCPP_SUPPRESS_DEPRECATED_POP 
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type; 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef char8_t argument_type; 
+#endif 
+    _LIBCPP_INLINE_VISIBILITY 
+    size_t operator()(char8_t __v) const _NOEXCEPT {return static_cast<size_t>(__v);} 
+}; 
+#endif // !_LIBCPP_HAS_NO_CHAR8_T 
+ 
+#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS 
+ 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH 
+template <> 
+struct _LIBCPP_TEMPLATE_VIS hash<char16_t> 
+#if !defined(_LIBCPP_ABI_NO_BINDER_BASES) 
+    : public unary_function<char16_t, size_t> 
+#endif 
+{ 
+_LIBCPP_SUPPRESS_DEPRECATED_POP 
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type; 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef char16_t argument_type; 
+#endif 
+    _LIBCPP_INLINE_VISIBILITY 
+    size_t operator()(char16_t __v) const _NOEXCEPT {return static_cast<size_t>(__v);} 
+}; 
+ 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH 
+template <> 
+struct _LIBCPP_TEMPLATE_VIS hash<char32_t> 
+#if !defined(_LIBCPP_ABI_NO_BINDER_BASES) 
+    : public unary_function<char32_t, size_t> 
+#endif 
+{ 
+_LIBCPP_SUPPRESS_DEPRECATED_POP 
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type; 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef char32_t argument_type; 
+#endif 
+    _LIBCPP_INLINE_VISIBILITY 
+    size_t operator()(char32_t __v) const _NOEXCEPT {return static_cast<size_t>(__v);} 
+}; 
+ 
+#endif // _LIBCPP_HAS_NO_UNICODE_CHARS 
+ 
+#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH 
+template <> 
+struct _LIBCPP_TEMPLATE_VIS hash<wchar_t> 
+#if !defined(_LIBCPP_ABI_NO_BINDER_BASES) 
+    : public unary_function<wchar_t, size_t> 
+#endif 
+{ 
+_LIBCPP_SUPPRESS_DEPRECATED_POP 
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type; 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef wchar_t argument_type; 
+#endif 
+    _LIBCPP_INLINE_VISIBILITY 
+    size_t operator()(wchar_t __v) const _NOEXCEPT {return static_cast<size_t>(__v);} 
+}; 
+#endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS 
+ 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH 
+template <> 
+struct _LIBCPP_TEMPLATE_VIS hash<short> 
+#if !defined(_LIBCPP_ABI_NO_BINDER_BASES) 
+    : public unary_function<short, size_t> 
+#endif 
+{ 
+_LIBCPP_SUPPRESS_DEPRECATED_POP 
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type; 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef short argument_type; 
+#endif 
+    _LIBCPP_INLINE_VISIBILITY 
+    size_t operator()(short __v) const _NOEXCEPT {return static_cast<size_t>(__v);} 
+}; 
+ 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH 
+template <> 
+struct _LIBCPP_TEMPLATE_VIS hash<unsigned short> 
+#if !defined(_LIBCPP_ABI_NO_BINDER_BASES) 
+    : public unary_function<unsigned short, size_t> 
+#endif 
+{ 
+_LIBCPP_SUPPRESS_DEPRECATED_POP 
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type; 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef unsigned short argument_type; 
+#endif 
+    _LIBCPP_INLINE_VISIBILITY 
+    size_t operator()(unsigned short __v) const _NOEXCEPT {return static_cast<size_t>(__v);} 
+}; 
+ 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH 
+template <> 
+struct _LIBCPP_TEMPLATE_VIS hash<int> 
+#if !defined(_LIBCPP_ABI_NO_BINDER_BASES) 
+    : public unary_function<int, size_t> 
+#endif 
+{ 
+_LIBCPP_SUPPRESS_DEPRECATED_POP 
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type; 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef int argument_type; 
+#endif 
+    _LIBCPP_INLINE_VISIBILITY 
+    size_t operator()(int __v) const _NOEXCEPT {return static_cast<size_t>(__v);} 
+}; 
+ 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH 
+template <> 
+struct _LIBCPP_TEMPLATE_VIS hash<unsigned int> 
+#if !defined(_LIBCPP_ABI_NO_BINDER_BASES) 
+    : public unary_function<unsigned int, size_t> 
+#endif 
+{ 
+_LIBCPP_SUPPRESS_DEPRECATED_POP 
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type; 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef unsigned int argument_type; 
+#endif 
+    _LIBCPP_INLINE_VISIBILITY 
+    size_t operator()(unsigned int __v) const _NOEXCEPT {return static_cast<size_t>(__v);} 
+}; 
+ 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH 
+template <> 
+struct _LIBCPP_TEMPLATE_VIS hash<long> 
+#if !defined(_LIBCPP_ABI_NO_BINDER_BASES) 
+    : public unary_function<long, size_t> 
+#endif 
+{ 
+_LIBCPP_SUPPRESS_DEPRECATED_POP 
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type; 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef long argument_type; 
+#endif 
+    _LIBCPP_INLINE_VISIBILITY 
+    size_t operator()(long __v) const _NOEXCEPT {return static_cast<size_t>(__v);} 
+}; 
+ 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH 
+template <> 
+struct _LIBCPP_TEMPLATE_VIS hash<unsigned long> 
+#if !defined(_LIBCPP_ABI_NO_BINDER_BASES) 
+    : public unary_function<unsigned long, size_t> 
+#endif 
+{ 
+_LIBCPP_SUPPRESS_DEPRECATED_POP 
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type; 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef unsigned long argument_type; 
+#endif 
+    _LIBCPP_INLINE_VISIBILITY 
+    size_t operator()(unsigned long __v) const _NOEXCEPT {return static_cast<size_t>(__v);} 
+}; 
+ 
+template <> 
+struct _LIBCPP_TEMPLATE_VIS hash<long long> 
+    : public __scalar_hash<long long> 
+{ 
+}; 
+ 
+template <> 
+struct _LIBCPP_TEMPLATE_VIS hash<unsigned long long> 
+    : public __scalar_hash<unsigned long long> 
+{ 
+}; 
+ 
+#ifndef _LIBCPP_HAS_NO_INT128 
+ 
+template <> 
+struct _LIBCPP_TEMPLATE_VIS hash<__int128_t> 
+    : public __scalar_hash<__int128_t> 
+{ 
+}; 
+ 
+template <> 
+struct _LIBCPP_TEMPLATE_VIS hash<__uint128_t> 
+    : public __scalar_hash<__uint128_t> 
+{ 
+}; 
+ 
+#endif 
+ 
+template <> 
+struct _LIBCPP_TEMPLATE_VIS hash<float> 
+    : public __scalar_hash<float> 
+{ 
+    _LIBCPP_INLINE_VISIBILITY 
+    size_t operator()(float __v) const _NOEXCEPT 
+    { 
+        // -0.0 and 0.0 should return same hash 
+       if (__v == 0.0f) 
+           return 0; 
+        return __scalar_hash<float>::operator()(__v); 
+    } 
+}; 
+ 
+template <> 
+struct _LIBCPP_TEMPLATE_VIS hash<double> 
+    : public __scalar_hash<double> 
+{ 
+    _LIBCPP_INLINE_VISIBILITY 
+    size_t operator()(double __v) const _NOEXCEPT 
+    { 
+        // -0.0 and 0.0 should return same hash 
+       if (__v == 0.0) 
+           return 0; 
+        return __scalar_hash<double>::operator()(__v); 
+    } 
+}; 
+ 
+template <> 
+struct _LIBCPP_TEMPLATE_VIS hash<long double> 
+    : public __scalar_hash<long double> 
+{ 
+    _LIBCPP_INLINE_VISIBILITY 
+    size_t operator()(long double __v) const _NOEXCEPT 
+    { 
+        // -0.0 and 0.0 should return same hash 
+        if (__v == 0.0L) 
+            return 0; 
+#if defined(__i386__) || (defined(__x86_64__) && defined(__ILP32__)) 
+        // Zero out padding bits 
+        union 
+        { 
+            long double __t; 
+            struct 
+            { 
+                size_t __a; 
+                size_t __b; 
+                size_t __c; 
+                size_t __d; 
+            } __s; 
+        } __u; 
+        __u.__s.__a = 0; 
+        __u.__s.__b = 0; 
+        __u.__s.__c = 0; 
+        __u.__s.__d = 0; 
+        __u.__t = __v; 
+        return __u.__s.__a ^ __u.__s.__b ^ __u.__s.__c ^ __u.__s.__d; 
+#elif defined(__x86_64__) 
+        // Zero out padding bits 
+        union 
+        { 
+            long double __t; 
+            struct 
+            { 
+                size_t __a; 
+                size_t __b; 
+            } __s; 
+        } __u; 
+        __u.__s.__a = 0; 
+        __u.__s.__b = 0; 
+        __u.__t = __v; 
+        return __u.__s.__a ^ __u.__s.__b; 
+#else 
+        return __scalar_hash<long double>::operator()(__v); 
+#endif 
+    } 
+}; 
+ 
+#if _LIBCPP_STD_VER > 11 
+ 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH 
+template <class _Tp, bool = is_enum<_Tp>::value> 
+struct _LIBCPP_TEMPLATE_VIS __enum_hash 
+#if !defined(_LIBCPP_ABI_NO_BINDER_BASES) 
+    : public unary_function<_Tp, size_t> 
+#endif 
+{ 
+_LIBCPP_SUPPRESS_DEPRECATED_POP 
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type; 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef _Tp argument_type; 
+#endif 
+    _LIBCPP_INLINE_VISIBILITY 
+    size_t operator()(_Tp __v) const _NOEXCEPT 
+    { 
+        typedef typename underlying_type<_Tp>::type type; 
+        return hash<type>{}(static_cast<type>(__v)); 
+    } 
+}; 
+template <class _Tp> 
+struct _LIBCPP_TEMPLATE_VIS __enum_hash<_Tp, false> { 
+    __enum_hash() = delete; 
+    __enum_hash(__enum_hash const&) = delete; 
+    __enum_hash& operator=(__enum_hash const&) = delete; 
+}; 
+ 
+template <class _Tp> 
+struct _LIBCPP_TEMPLATE_VIS hash : public __enum_hash<_Tp> 
+{ 
+}; 
+#endif 
+ 
+#if _LIBCPP_STD_VER > 14 
+ 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH 
+template <> 
+struct _LIBCPP_TEMPLATE_VIS hash<nullptr_t> 
+#if !defined(_LIBCPP_ABI_NO_BINDER_BASES) 
+  : public unary_function<nullptr_t, size_t> 
+#endif 
+{ 
+_LIBCPP_SUPPRESS_DEPRECATED_POP 
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type; 
+    _LIBCPP_DEPRECATED_IN_CXX17 typedef nullptr_t argument_type; 
+#endif 
+    _LIBCPP_INLINE_VISIBILITY 
+    size_t operator()(nullptr_t) const _NOEXCEPT { 
+        return 662607004ull; 
+    } 
+}; 
+#endif 
+ 
+#ifndef _LIBCPP_CXX03_LANG 
+template <class _Key, class _Hash> 
+using __check_hash_requirements _LIBCPP_NODEBUG = integral_constant<bool, 
+    is_copy_constructible<_Hash>::value && 
+    is_move_constructible<_Hash>::value && 
+    __invokable_r<size_t, _Hash, _Key const&>::value 
+>; 
+ 
+template <class _Key, class _Hash = hash<_Key> > 
+using __has_enabled_hash _LIBCPP_NODEBUG = integral_constant<bool, 
+    __check_hash_requirements<_Key, _Hash>::value && 
+    is_default_constructible<_Hash>::value 
+>; 
+ 
+#if _LIBCPP_STD_VER > 14 
+template <class _Type, class> 
+using __enable_hash_helper_imp _LIBCPP_NODEBUG = _Type; 
+ 
+template <class _Type, class ..._Keys> 
+using __enable_hash_helper _LIBCPP_NODEBUG = __enable_hash_helper_imp<_Type, 
+  typename enable_if<__all<__has_enabled_hash<_Keys>::value...>::value>::type 
+>; 
+#else 
+template <class _Type, class ...> 
+using __enable_hash_helper _LIBCPP_NODEBUG = _Type; 
+#endif 
+ 
+#endif // !_LIBCPP_CXX03_LANG 
+ 
+_LIBCPP_END_NAMESPACE_STD 
+ 
+#endif // _LIBCPP___FUNCTIONAL_HASH_H