37 lines
1.2 KiB
C++
37 lines
1.2 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 "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, 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 POD (trivially copyable and having
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* standard layout), it is also critical that either the struct includes no padding, or that any
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* padding is initialized to a known value 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(
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std::is_trivially_copyable<T>::value && std::is_standard_layout<T>::value,
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"Type passed to ComputeStructHash64 must be trivially copyable and standard layout");
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return ComputeHash64(&data, sizeof(data));
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}
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} // namespace Common
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