jeanlemotan
61 lines
1.9 KiB
C++
61 lines
1.9 KiB
C++
#pragma once
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#include "tl/detail/prologue.h"
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#include "EASTL/functional.h"
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namespace tl
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{
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using namespace eastl;
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template <class T>
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constexpr inline void hash_and_combine(uint32_t& seed, const T& v) noexcept
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{
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//the result of the hasher is size_t so - if used in arithmetic - it might produce different results in 32 and 64 bit platforms
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//therefore we cast it here to 32 bit.
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tl::hash<T> hasher;
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seed ^= static_cast<uint32_t>(hasher(v)) + static_cast<uint32_t>(0x9e3779b9) + (seed << 6) + (seed >> 2);
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}
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template <class T>
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constexpr inline void hash_and_combine(uint64_t& seed, const T& v) noexcept
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{
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//the result of the hasher is size_t so - if used in arithmetic - it might produce different results in 32 and 64 bit platforms
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//therefore we cast it here to 32 bit.
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tl::hash<T> hasher;
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seed ^= static_cast<uint32_t>(hasher(v)) + 0xA6E9377DAF75BDFEULL + (seed << 6) + (seed >> 2);
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}
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#if defined(TL_PLATFORM_OSX_FAMILY)
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template <class T>
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constexpr inline void hash_and_combine(size_t& seed, const T& v) noexcept
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{
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tl::hash<T> hasher;
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seed ^= hasher(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
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}
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#endif
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constexpr inline void hash_combine(uint32_t& seed, const uint32_t v) noexcept
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{
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//the result of the hasher is size_t so - if used in arithmetic - it might produce different results in 32 and 64 bit platforms
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//therefore we cast it here to 32 bit.
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seed ^= v + static_cast<uint32_t>(0x9e3779b9u) + (seed << 6) + (seed >> 2);
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}
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constexpr inline void hash_combine(uint64_t& seed, const uint64_t v) noexcept
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{
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//the result of the hasher is size_t so - if used in arithmetic - it might produce different results in 32 and 64 bit platforms
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//therefore we cast it here to 32 bit.
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seed ^= static_cast<uint32_t>(v) + 0xA6E9377DAF75BDFEULL + (seed << 6) + (seed >> 2);
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}
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#if defined(TL_PLATFORM_OSX_FAMILY)
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constexpr inline void hash_combine(size_t& seed, const size_t v) noexcept
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{
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seed ^= v + 0x9e3779b9 + (seed << 6) + (seed >> 2);
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}
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#endif
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}
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