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https://git.eden-emu.dev/eden-emu/eden.git
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crueter
7fda6dde73
Replaces all instances of ankerl's unordered map/set with boost's `unordered_flat_*` classes. This uses std::hash since boost::hash is actually a lot slower. Also adds an abstraction layer in `Common` so future changes are quicker and easier. Other implementation details: - ankerl provided hash specializations for tuple and pair, so those were ported here - std::erase_if doesn't work on boost, so just used the ADL'd erase_if This should be about equal or superior performance as unordered_dense for everything except iteration. Signed-off-by: crueter <crueter@eden-emu.dev> - [x] I have read and followed the [Contribution Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/CONTRIBUTING.md#code-contributions). - [x] I have read and followed the [AI Policy](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/AI.md) - [x] I have read and followed the [Coding Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/Coding.md) to the best of my ability. ------------------- Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4326 Reviewed-by: Lizzie and Samuel <lizzie@eden-emu.dev> Reviewed-by: MaranBr <maranbr@eden-emu.dev>
131 lines
3.2 KiB
C++
131 lines
3.2 KiB
C++
// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
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// SPDX-License-Identifier: GPL-3.0-or-later
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// SPDX-FileCopyrightText: 2005-2014 Daniel James
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// SPDX-FileCopyrightText: 2016 Austin Appleby
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// SPDX-License-Identifier: BSL-1.0
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#pragma once
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#include <array>
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#include <climits>
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#include <cstdint>
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#include <functional>
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#include <limits>
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#include <tuple>
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#include <type_traits>
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#include <utility>
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#include <vector>
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namespace Common {
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namespace detail {
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template <typename T>
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requires std::is_unsigned_v<T>
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inline std::size_t HashValue(T val) {
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const unsigned int size_t_bits = std::numeric_limits<std::size_t>::digits;
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const unsigned int length =
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(std::numeric_limits<T>::digits - 1) / static_cast<unsigned int>(size_t_bits);
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std::size_t seed = 0;
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for (unsigned int i = length * size_t_bits; i > 0; i -= size_t_bits) {
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seed ^= static_cast<size_t>(val >> i) + (seed << 6) + (seed >> 2);
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}
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seed ^= static_cast<size_t>(val) + (seed << 6) + (seed >> 2);
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return seed;
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}
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template <size_t Bits>
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struct HashCombineImpl {
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template <typename T>
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static inline T fn(T seed, T value) {
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seed ^= value + 0x9e3779b9 + (seed << 6) + (seed >> 2);
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return seed;
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}
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};
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template <>
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struct HashCombineImpl<64> {
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static inline std::uint64_t fn(std::uint64_t h, std::uint64_t k) {
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const std::uint64_t m = (std::uint64_t(0xc6a4a793) << 32) + 0x5bd1e995;
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const int r = 47;
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k *= m;
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k ^= k >> r;
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k *= m;
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h ^= k;
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h *= m;
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// Completely arbitrary number, to prevent 0's
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// from hashing to 0.
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h += 0xe6546b64;
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return h;
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}
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};
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} // namespace detail
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template <typename T>
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requires std::is_unsigned_v<T>
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inline void HashCombine(std::size_t& seed, const T& v) {
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seed = detail::HashCombineImpl<sizeof(std::size_t) * CHAR_BIT>::fn(seed, detail::HashValue(v));
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}
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template <typename T>
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requires (!std::is_unsigned_v<T>)
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inline void HashCombine(std::size_t& seed, const T& v) {
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seed = detail::HashCombineImpl<sizeof(std::size_t) * CHAR_BIT>::fn(seed, std::hash<T>{}(v));
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}
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template <typename It>
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inline std::size_t HashRange(It first, It last) {
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std::size_t seed = 0;
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for (; first != last; ++first) {
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HashCombine<typename std::iterator_traits<It>::value_type>(seed, *first);
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}
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return seed;
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}
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template <typename T, size_t Size>
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std::size_t HashValue(const std::array<T, Size>& v) {
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return HashRange(v.cbegin(), v.cend());
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}
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template <typename T, typename Allocator>
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std::size_t HashValue(const std::vector<T, Allocator>& v) {
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return HashRange(v.cbegin(), v.cend());
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}
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} // namespace Common
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namespace std {
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template <typename... Args>
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struct hash<std::tuple<Args...>> {
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std::size_t operator()(const std::tuple<Args...>& t) const noexcept {
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std::size_t seed = 0;
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std::apply([&seed](const Args&... args) { (Common::HashCombine(seed, args), ...); }, t);
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return seed;
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}
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};
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template <class A, class B>
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struct hash<std::pair<A, B>> {
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std::size_t operator()(const std::pair<A, B>& p) const noexcept {
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std::size_t seed = 0;
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Common::HashCombine(seed, p.first);
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Common::HashCombine(seed, p.second);
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return seed;
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}
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};
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} // namespace std
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