50 lines
824 B
C++
50 lines
824 B
C++
#pragma once
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#include <BAN/Traits.h>
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#include <stddef.h>
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#include <stdint.h>
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namespace BAN
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{
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template<typename T>
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struct hash;
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using hash_t = uint32_t;
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inline constexpr hash_t u32_hash(uint32_t val)
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{
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val = ((val >> 16) ^ val) * 0x119de1f3;
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val = ((val >> 16) ^ val) * 0x119de1f3;
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val = ((val >> 16) ^ val);
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return val;
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}
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inline constexpr hash_t u64_hash(uint64_t val)
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{
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hash_t low = u32_hash(val);
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hash_t high = u32_hash(val >> 32);
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return low ^ high;
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}
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template<integral T>
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struct hash<T>
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{
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constexpr hash_t operator()(T val) const
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{
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if constexpr(sizeof(val) <= sizeof(uint32_t))
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return u32_hash(val);
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return u64_hash(val);
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}
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};
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template<pointer T>
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struct hash<T>
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{
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constexpr hash_t operator()(T val) const
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{
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return hash<uintptr_t>()((uintptr_t)val);
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}
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};
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} |