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21bd28542a
2d coord hash moved to hash.hpp file format version adds suffix to be more coherent don't use ESM::RefId::sEmpty RefId equality with string_view, conversion to refId unecessary action teleport remove test that mCellId is empty removes some const references, when copy is enough invalid refid => empty refid removes useless change
27 lines
798 B
C++
27 lines
798 B
C++
#ifndef MISC_HASH_H
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#define MISC_HASH_H
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#include <cstddef>
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#include <cstdint>
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#include <functional>
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namespace Misc
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{
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/// Implemented similar to the boost::hash_combine
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template <class Seed, class T>
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inline void hashCombine(Seed& seed, const T& v)
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{
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static_assert(sizeof(Seed) >= sizeof(std::size_t), "Resulting hash will be truncated");
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std::hash<T> hasher;
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seed ^= static_cast<Seed>(hasher(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2));
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}
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// Comes from https://stackoverflow.com/questions/2634690/good-hash-function-for-a-2d-index
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// Effective Java (2nd edition) is cited as the source
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inline std::size_t hash2dCoord(int32_t x, int32_t y)
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{
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return (53 + std::hash<int32_t>{}(x)) * 53 + std::hash<int32_t>{}(y);
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}
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}
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#endif
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