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Remove unused boost include and split out std-hash.hh

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Splitting it out immediately answers questions like [this],
without increasing the number of compilation units.

I did consider using boost::hash_combine instead, but it doesn't seem
to be quite as capable, accepting only two arguments.

[this]: https://github.com/NixOS/nix/pull/11113#discussion_r1679991573
This commit is contained in:
Robert Hensing 2024-07-16 22:22:15 +02:00
parent 64b46000ad
commit d0e9878389
5 changed files with 27 additions and 17 deletions
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14
src/libutil/util.hh
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@ -375,18 +375,4 @@ inline std::string operator + (std::string_view s1, const char * s2)
return s;
}
/**
* hash_combine() from Boost. Hash several hashable values together
* into a single hash.
*/
inline void hash_combine(std::size_t & seed) { }
template <typename T, typename... Rest>
inline void hash_combine(std::size_t & seed, const T & v, Rest... rest)
{
std::hash<T> hasher;
seed ^= hasher(v) + 0x9e3779b9 + (seed<<6) + (seed>>2);
hash_combine(seed, rest...);
}
}