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Hash enums with underlying type instead of int

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Thanks to jameyboor
This commit is contained in:
Rochet2
2016-02-01 21:37:25 +02:00
parent c1f342406f
commit a3b20b248e
1 changed files with 9 additions and 4 deletions
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13
BindingMap.h
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@@ -274,18 +274,23 @@ public:
return seed; return seed;
} }
template <typename T> template <typename T, typename std::enable_if<std::is_enum<T>::value>::type* = nullptr>
static inline result_type hash(T const & t) static inline result_type hash(T const & t)
{ {
// Possibly convert int to std::underlying_type or find another way return std::hash<typename std::underlying_type<T>::type>()(t);
using Hasher = typename std::conditional< std::is_enum<T>::value, std::hash<int>, std::hash<T> >::type; }
return Hasher()(t);
template <typename T, typename std::enable_if<!std::is_enum<T>::value>::type* = nullptr>
static inline result_type hash(T const & t)
{
return std::hash<T>()(t);
} }
private: private:
template <typename T> template <typename T>
static inline void _hash_combine(result_type& seed, T const & v) static inline void _hash_combine(result_type& seed, T const & v)
{ {
// from http://www.boost.org/doc/libs/1_40_0/boost/functional/hash/hash.hpp
seed ^= hash(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2); seed ^= hash(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
} }