368faacac7
This commit reverts5aaefa51(and also partly7f285f48e7andb6d75682f9, which were related to the original commit). As landed,5aaefa51had 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
868 lines
26 KiB
C++
868 lines
26 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___FUNCTIONAL_HASH_H
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#define _LIBCPP___FUNCTIONAL_HASH_H
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#include <__config>
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#include <__functional/unary_function.h>
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#include <__tuple>
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#include <__utility/forward.h>
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#include <__utility/move.h>
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#include <__utility/pair.h>
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#include <__utility/swap.h>
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#include <cstddef>
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#include <cstdint>
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#include <cstring>
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#include <limits>
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#include <type_traits>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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template <class _Size>
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inline _LIBCPP_INLINE_VISIBILITY
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_Size
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__loadword(const void* __p)
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{
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_Size __r;
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_VSTD::memcpy(&__r, __p, sizeof(__r));
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return __r;
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}
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// We use murmur2 when size_t is 32 bits, and cityhash64 when size_t
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// is 64 bits. This is because cityhash64 uses 64bit x 64bit
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// multiplication, which can be very slow on 32-bit systems.
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template <class _Size, size_t = sizeof(_Size)*__CHAR_BIT__>
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struct __murmur2_or_cityhash;
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template <class _Size>
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struct __murmur2_or_cityhash<_Size, 32>
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{
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inline _Size operator()(const void* __key, _Size __len)
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_LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK;
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};
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// murmur2
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template <class _Size>
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_Size
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__murmur2_or_cityhash<_Size, 32>::operator()(const void* __key, _Size __len)
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{
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const _Size __m = 0x5bd1e995;
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const _Size __r = 24;
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_Size __h = __len;
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const unsigned char* __data = static_cast<const unsigned char*>(__key);
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for (; __len >= 4; __data += 4, __len -= 4)
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{
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_Size __k = __loadword<_Size>(__data);
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__k *= __m;
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__k ^= __k >> __r;
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__k *= __m;
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__h *= __m;
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__h ^= __k;
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}
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switch (__len)
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{
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case 3:
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__h ^= static_cast<_Size>(__data[2] << 16);
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_LIBCPP_FALLTHROUGH();
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case 2:
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__h ^= static_cast<_Size>(__data[1] << 8);
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_LIBCPP_FALLTHROUGH();
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case 1:
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__h ^= __data[0];
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__h *= __m;
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}
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__h ^= __h >> 13;
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__h *= __m;
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__h ^= __h >> 15;
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return __h;
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}
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template <class _Size>
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struct __murmur2_or_cityhash<_Size, 64>
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{
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inline _Size operator()(const void* __key, _Size __len) _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK;
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private:
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// Some primes between 2^63 and 2^64.
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static const _Size __k0 = 0xc3a5c85c97cb3127ULL;
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static const _Size __k1 = 0xb492b66fbe98f273ULL;
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static const _Size __k2 = 0x9ae16a3b2f90404fULL;
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static const _Size __k3 = 0xc949d7c7509e6557ULL;
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static _Size __rotate(_Size __val, int __shift) {
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return __shift == 0 ? __val : ((__val >> __shift) | (__val << (64 - __shift)));
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}
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static _Size __rotate_by_at_least_1(_Size __val, int __shift) {
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return (__val >> __shift) | (__val << (64 - __shift));
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}
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static _Size __shift_mix(_Size __val) {
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return __val ^ (__val >> 47);
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}
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static _Size __hash_len_16(_Size __u, _Size __v)
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_LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
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{
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const _Size __mul = 0x9ddfea08eb382d69ULL;
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_Size __a = (__u ^ __v) * __mul;
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__a ^= (__a >> 47);
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_Size __b = (__v ^ __a) * __mul;
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__b ^= (__b >> 47);
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__b *= __mul;
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return __b;
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}
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static _Size __hash_len_0_to_16(const char* __s, _Size __len)
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_LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
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{
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if (__len > 8) {
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const _Size __a = __loadword<_Size>(__s);
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const _Size __b = __loadword<_Size>(__s + __len - 8);
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return __hash_len_16(__a, __rotate_by_at_least_1(__b + __len, __len)) ^ __b;
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}
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if (__len >= 4) {
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const uint32_t __a = __loadword<uint32_t>(__s);
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const uint32_t __b = __loadword<uint32_t>(__s + __len - 4);
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return __hash_len_16(__len + (__a << 3), __b);
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}
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if (__len > 0) {
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const unsigned char __a = static_cast<unsigned char>(__s[0]);
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const unsigned char __b = static_cast<unsigned char>(__s[__len >> 1]);
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const unsigned char __c = static_cast<unsigned char>(__s[__len - 1]);
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const uint32_t __y = static_cast<uint32_t>(__a) +
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(static_cast<uint32_t>(__b) << 8);
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const uint32_t __z = __len + (static_cast<uint32_t>(__c) << 2);
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return __shift_mix(__y * __k2 ^ __z * __k3) * __k2;
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}
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return __k2;
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}
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static _Size __hash_len_17_to_32(const char *__s, _Size __len)
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_LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
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{
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const _Size __a = __loadword<_Size>(__s) * __k1;
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const _Size __b = __loadword<_Size>(__s + 8);
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const _Size __c = __loadword<_Size>(__s + __len - 8) * __k2;
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const _Size __d = __loadword<_Size>(__s + __len - 16) * __k0;
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return __hash_len_16(__rotate(__a - __b, 43) + __rotate(__c, 30) + __d,
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__a + __rotate(__b ^ __k3, 20) - __c + __len);
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}
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// Return a 16-byte hash for 48 bytes. Quick and dirty.
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// Callers do best to use "random-looking" values for a and b.
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static pair<_Size, _Size> __weak_hash_len_32_with_seeds(
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_Size __w, _Size __x, _Size __y, _Size __z, _Size __a, _Size __b)
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_LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
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{
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__a += __w;
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__b = __rotate(__b + __a + __z, 21);
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const _Size __c = __a;
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__a += __x;
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__a += __y;
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__b += __rotate(__a, 44);
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return pair<_Size, _Size>(__a + __z, __b + __c);
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}
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// Return a 16-byte hash for s[0] ... s[31], a, and b. Quick and dirty.
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static pair<_Size, _Size> __weak_hash_len_32_with_seeds(
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const char* __s, _Size __a, _Size __b)
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_LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
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{
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return __weak_hash_len_32_with_seeds(__loadword<_Size>(__s),
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__loadword<_Size>(__s + 8),
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__loadword<_Size>(__s + 16),
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__loadword<_Size>(__s + 24),
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__a,
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__b);
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}
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// Return an 8-byte hash for 33 to 64 bytes.
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static _Size __hash_len_33_to_64(const char *__s, size_t __len)
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_LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
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{
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_Size __z = __loadword<_Size>(__s + 24);
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_Size __a = __loadword<_Size>(__s) +
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(__len + __loadword<_Size>(__s + __len - 16)) * __k0;
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_Size __b = __rotate(__a + __z, 52);
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_Size __c = __rotate(__a, 37);
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__a += __loadword<_Size>(__s + 8);
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__c += __rotate(__a, 7);
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__a += __loadword<_Size>(__s + 16);
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_Size __vf = __a + __z;
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_Size __vs = __b + __rotate(__a, 31) + __c;
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__a = __loadword<_Size>(__s + 16) + __loadword<_Size>(__s + __len - 32);
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__z += __loadword<_Size>(__s + __len - 8);
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__b = __rotate(__a + __z, 52);
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__c = __rotate(__a, 37);
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__a += __loadword<_Size>(__s + __len - 24);
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__c += __rotate(__a, 7);
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__a += __loadword<_Size>(__s + __len - 16);
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_Size __wf = __a + __z;
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_Size __ws = __b + __rotate(__a, 31) + __c;
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_Size __r = __shift_mix((__vf + __ws) * __k2 + (__wf + __vs) * __k0);
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return __shift_mix(__r * __k0 + __vs) * __k2;
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}
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};
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// cityhash64
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template <class _Size>
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_Size
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__murmur2_or_cityhash<_Size, 64>::operator()(const void* __key, _Size __len)
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{
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const char* __s = static_cast<const char*>(__key);
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if (__len <= 32) {
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if (__len <= 16) {
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return __hash_len_0_to_16(__s, __len);
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} else {
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return __hash_len_17_to_32(__s, __len);
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}
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} else if (__len <= 64) {
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return __hash_len_33_to_64(__s, __len);
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}
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// For strings over 64 bytes we hash the end first, and then as we
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// loop we keep 56 bytes of state: v, w, x, y, and z.
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_Size __x = __loadword<_Size>(__s + __len - 40);
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_Size __y = __loadword<_Size>(__s + __len - 16) +
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__loadword<_Size>(__s + __len - 56);
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_Size __z = __hash_len_16(__loadword<_Size>(__s + __len - 48) + __len,
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__loadword<_Size>(__s + __len - 24));
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pair<_Size, _Size> __v = __weak_hash_len_32_with_seeds(__s + __len - 64, __len, __z);
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pair<_Size, _Size> __w = __weak_hash_len_32_with_seeds(__s + __len - 32, __y + __k1, __x);
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__x = __x * __k1 + __loadword<_Size>(__s);
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// Decrease len to the nearest multiple of 64, and operate on 64-byte chunks.
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__len = (__len - 1) & ~static_cast<_Size>(63);
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do {
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__x = __rotate(__x + __y + __v.first + __loadword<_Size>(__s + 8), 37) * __k1;
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__y = __rotate(__y + __v.second + __loadword<_Size>(__s + 48), 42) * __k1;
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__x ^= __w.second;
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__y += __v.first + __loadword<_Size>(__s + 40);
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__z = __rotate(__z + __w.first, 33) * __k1;
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__v = __weak_hash_len_32_with_seeds(__s, __v.second * __k1, __x + __w.first);
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__w = __weak_hash_len_32_with_seeds(__s + 32, __z + __w.second,
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__y + __loadword<_Size>(__s + 16));
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_VSTD::swap(__z, __x);
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__s += 64;
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__len -= 64;
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} while (__len != 0);
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return __hash_len_16(
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__hash_len_16(__v.first, __w.first) + __shift_mix(__y) * __k1 + __z,
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__hash_len_16(__v.second, __w.second) + __x);
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}
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template <class _Tp, size_t = sizeof(_Tp) / sizeof(size_t)>
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struct __scalar_hash;
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_LIBCPP_SUPPRESS_DEPRECATED_PUSH
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template <class _Tp>
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struct __scalar_hash<_Tp, 0>
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#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
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: public unary_function<_Tp, size_t>
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#endif
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{
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_LIBCPP_SUPPRESS_DEPRECATED_POP
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#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
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_LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
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_LIBCPP_DEPRECATED_IN_CXX17 typedef _Tp argument_type;
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#endif
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_LIBCPP_INLINE_VISIBILITY
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size_t operator()(_Tp __v) const _NOEXCEPT
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{
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union
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{
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_Tp __t;
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size_t __a;
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} __u;
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__u.__a = 0;
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__u.__t = __v;
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return __u.__a;
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}
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};
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_LIBCPP_SUPPRESS_DEPRECATED_PUSH
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template <class _Tp>
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struct __scalar_hash<_Tp, 1>
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#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
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: public unary_function<_Tp, size_t>
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#endif
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{
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_LIBCPP_SUPPRESS_DEPRECATED_POP
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#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
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_LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
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_LIBCPP_DEPRECATED_IN_CXX17 typedef _Tp argument_type;
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#endif
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_LIBCPP_INLINE_VISIBILITY
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size_t operator()(_Tp __v) const _NOEXCEPT
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{
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union
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{
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_Tp __t;
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size_t __a;
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} __u;
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__u.__t = __v;
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return __u.__a;
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}
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};
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_LIBCPP_SUPPRESS_DEPRECATED_PUSH
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template <class _Tp>
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struct __scalar_hash<_Tp, 2>
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#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
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: public unary_function<_Tp, size_t>
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#endif
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{
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_LIBCPP_SUPPRESS_DEPRECATED_POP
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#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
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_LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
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_LIBCPP_DEPRECATED_IN_CXX17 typedef _Tp argument_type;
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#endif
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_LIBCPP_INLINE_VISIBILITY
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size_t operator()(_Tp __v) const _NOEXCEPT
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{
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union
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{
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_Tp __t;
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struct
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{
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size_t __a;
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size_t __b;
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} __s;
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} __u;
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__u.__t = __v;
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return __murmur2_or_cityhash<size_t>()(&__u, sizeof(__u));
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}
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};
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_LIBCPP_SUPPRESS_DEPRECATED_PUSH
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template <class _Tp>
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struct __scalar_hash<_Tp, 3>
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#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
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: public unary_function<_Tp, size_t>
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#endif
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{
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_LIBCPP_SUPPRESS_DEPRECATED_POP
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#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
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_LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
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_LIBCPP_DEPRECATED_IN_CXX17 typedef _Tp argument_type;
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#endif
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_LIBCPP_INLINE_VISIBILITY
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size_t operator()(_Tp __v) const _NOEXCEPT
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{
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union
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{
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_Tp __t;
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struct
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{
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size_t __a;
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size_t __b;
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size_t __c;
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} __s;
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} __u;
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__u.__t = __v;
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return __murmur2_or_cityhash<size_t>()(&__u, sizeof(__u));
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}
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};
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_LIBCPP_SUPPRESS_DEPRECATED_PUSH
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template <class _Tp>
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struct __scalar_hash<_Tp, 4>
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#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
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: public unary_function<_Tp, size_t>
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|
#endif
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|
{
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|
_LIBCPP_SUPPRESS_DEPRECATED_POP
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|
#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
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_LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
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|
_LIBCPP_DEPRECATED_IN_CXX17 typedef _Tp argument_type;
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#endif
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|
_LIBCPP_INLINE_VISIBILITY
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|
size_t operator()(_Tp __v) const _NOEXCEPT
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|
{
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union
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{
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_Tp __t;
|
|
struct
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|
{
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size_t __a;
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size_t __b;
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size_t __c;
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size_t __d;
|
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} __s;
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} __u;
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__u.__t = __v;
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return __murmur2_or_cityhash<size_t>()(&__u, sizeof(__u));
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}
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};
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struct _PairT {
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size_t first;
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size_t second;
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};
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_LIBCPP_INLINE_VISIBILITY
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inline size_t __hash_combine(size_t __lhs, size_t __rhs) _NOEXCEPT {
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typedef __scalar_hash<_PairT> _HashT;
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const _PairT __p = {__lhs, __rhs};
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return _HashT()(__p);
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}
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_LIBCPP_SUPPRESS_DEPRECATED_PUSH
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template<class _Tp>
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struct _LIBCPP_TEMPLATE_VIS hash<_Tp*>
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#if !defined(_LIBCPP_ABI_NO_BINDER_BASES)
|
|
: public unary_function<_Tp*, size_t>
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#endif
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|
{
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|
_LIBCPP_SUPPRESS_DEPRECATED_POP
|
|
#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
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_LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type;
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_LIBCPP_DEPRECATED_IN_CXX17 typedef _Tp* argument_type;
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#endif
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|
_LIBCPP_INLINE_VISIBILITY
|
|
size_t operator()(_Tp* __v) const _NOEXCEPT
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|
{
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|
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
|