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llvm-project/libcxx/include/__functional/hash.h
Louis Dionne 368faacac7 [libc++] Revert "Protect users from relying on detail headers" & related changes 
This commit reverts 5aaefa51 (and also partly 7f285f48e77 and b6d75682f9,
which were related to the original commit). As landed, 5aaefa51 had
unintended consequences on some downstream bots and didn't have proper
coverage upstream due to a few subtle things. Implementing this is
something we should do in libc++, however we'll first need to address
a few issues listed in https://reviews.llvm.org/D106124#3349710.

Differential Revision: https://reviews.llvm.org/D120683
2022-03-01 08:20:24 -05:00

868 lines
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//===----------------------------------------------------------------------===//
//
// 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 <cstddef>
#include <cstdint>
#include <cstring>
#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;
};
_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);
}
_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
}
};
_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>
{
};
#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
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