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Add a combine_hash helper function

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This commit is contained in:
Maxime Coste 2015-06-20 15:04:31 +01:00
parent b79c5e2f8a
commit 7fd7098265
1 changed files with 6 additions and 2 deletions
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8
src/hash.hh
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@ -31,12 +31,16 @@ size_t hash_values(Type&& t)
return hash_value(std::forward<Type>(t)); return hash_value(std::forward<Type>(t));
} }
inline size_t combine_hash(size_t lhs, size_t rhs)
{
return lhs ^ (rhs + 0x9e3779b9 + (lhs << 6) + (lhs >> 2));
}
template<typename Type, typename... RemainingTypes> template<typename Type, typename... RemainingTypes>
size_t hash_values(Type&& t, RemainingTypes&&... rt) size_t hash_values(Type&& t, RemainingTypes&&... rt)
{ {
size_t seed = hash_values(std::forward<RemainingTypes>(rt)...); size_t seed = hash_values(std::forward<RemainingTypes>(rt)...);
return seed ^ (hash_value(std::forward<Type>(t)) + 0x9e3779b9 + return combine_hash(seed, hash_value(std::forward<Type>(t)));
(seed << 6) + (seed >> 2));
} }
template<typename T1, typename T2> template<typename T1, typename T2>