ebecd60eb8
std::hash specialization is a pain to work with, stop using that, and just specialize a 'size_t hash_value(const T&)' free function.
58 lines
1.2 KiB
C++
58 lines
1.2 KiB
C++
#ifndef hash_hh_INCLUDED
|
|
#define hash_hh_INCLUDED
|
|
|
|
#include <type_traits>
|
|
#include <functional>
|
|
|
|
namespace Kakoune
|
|
{
|
|
|
|
size_t hash_data(const char* data, size_t len);
|
|
|
|
template<typename Type>
|
|
typename std::enable_if<not std::is_enum<Type>::value, size_t>::type
|
|
hash_value(const Type& val)
|
|
{
|
|
return std::hash<Type>()(val);
|
|
}
|
|
|
|
template<typename Type>
|
|
typename std::enable_if<std::is_enum<Type>::value, size_t>::type
|
|
hash_value(const Type& val)
|
|
{
|
|
return hash_value((typename std::underlying_type<Type>::type)val);
|
|
}
|
|
|
|
template<typename Type>
|
|
size_t hash_values(Type&& t)
|
|
{
|
|
return hash_value(std::forward<Type>(t));
|
|
}
|
|
|
|
template<typename Type, typename... RemainingTypes>
|
|
size_t hash_values(Type&& t, RemainingTypes&&... rt)
|
|
{
|
|
size_t seed = hash_values(std::forward<RemainingTypes>(rt)...);
|
|
return seed ^ (hash_value(std::forward<Type>(t)) + 0x9e3779b9 +
|
|
(seed << 6) + (seed >> 2));
|
|
}
|
|
|
|
template<typename T1, typename T2>
|
|
size_t hash_value(const std::pair<T1, T2>& val)
|
|
{
|
|
return hash_values(val.first, val.second);
|
|
}
|
|
|
|
template<typename Type>
|
|
struct Hash
|
|
{
|
|
size_t operator()(const Type& val) const
|
|
{
|
|
return hash_value(val);
|
|
}
|
|
};
|
|
|
|
}
|
|
|
|
#endif // hash_hh_INCLUDED
|