c5c89a4d5c
This is unused, so it can be removed. There's better ways of ensuring zeroed out padding bits, like using zero-initialization, anyhow.
48 lines
1.5 KiB
C++
48 lines
1.5 KiB
C++
// Copyright 2015 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <cstddef>
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#include <cstring>
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#include <utility>
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#include <boost/functional/hash.hpp>
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#include "common/cityhash.h"
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#include "common/common_types.h"
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namespace Common {
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/**
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* Computes a 64-bit hash over the specified block of data
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* @param data Block of data to compute hash over
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* @param len Length of data (in bytes) to compute hash over
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* @returns 64-bit hash value that was computed over the data block
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*/
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static inline u64 ComputeHash64(const void* data, std::size_t len) {
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return CityHash64(static_cast<const char*>(data), len);
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}
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/**
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* Computes a 64-bit hash of a struct. In addition to being trivially copyable, it is also critical
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* that either the struct includes no padding, or that any padding is initialized to a known value
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* by memsetting the struct to 0 before filling it in.
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*/
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template <typename T>
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static inline u64 ComputeStructHash64(const T& data) {
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static_assert(std::is_trivially_copyable_v<T>,
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"Type passed to ComputeStructHash64 must be trivially copyable");
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return ComputeHash64(&data, sizeof(data));
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}
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struct PairHash {
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template <class T1, class T2>
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std::size_t operator()(const std::pair<T1, T2>& pair) const noexcept {
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std::size_t seed = std::hash<T1>()(pair.first);
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boost::hash_combine(seed, std::hash<T2>()(pair.second));
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return seed;
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}
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};
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} // namespace Common
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