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84e2963f8e
This will facilitate breaking up Nix into multiple packages for each component with Meson.
24 lines
595 B
C++
24 lines
595 B
C++
#pragma once
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//!@file Hashing utilities for use with unordered_map, etc. (ie low level implementation logic, not domain logic like
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//! Nix hashing)
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#include <functional>
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namespace nix {
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/**
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* hash_combine() from Boost. Hash several hashable values together
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* into a single hash.
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*/
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inline void hash_combine(std::size_t & seed) {}
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template<typename T, typename... Rest>
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inline void hash_combine(std::size_t & seed, const T & v, Rest... rest)
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{
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std::hash<T> hasher;
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seed ^= hasher(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
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hash_combine(seed, rest...);
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}
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} // namespace nix
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