You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
2.1 KiB
75 lines
2.1 KiB
#pragma once
|
|
|
|
#include <type_traits>
|
|
#include <tuple>
|
|
#include "types.h"
|
|
// only works for 64 bit systems
|
|
constexpr size_t _FNV_offset_basis = 14695981039346656037ULL;
|
|
constexpr size_t _FNV_prime = 1099511628211ULL;
|
|
|
|
inline size_t append_bytes(const unsigned char* _First) noexcept {
|
|
size_t _Val = _FNV_offset_basis;
|
|
for (; *_First; ++_First) {
|
|
_Val ^= static_cast<size_t>(*_First);
|
|
_Val *= _FNV_prime;
|
|
}
|
|
|
|
return _Val;
|
|
}
|
|
|
|
namespace std{
|
|
template<>
|
|
struct hash<astring_view> {
|
|
size_t operator()(const astring_view& _Keyval) const noexcept {
|
|
return append_bytes(_Keyval.str);
|
|
}
|
|
};
|
|
template<>
|
|
struct hash<types::date_t> {
|
|
size_t operator() (const types::date_t& _Keyval) const noexcept {
|
|
return std::hash<unsigned int>()(*(unsigned int*)(&_Keyval));
|
|
}
|
|
};
|
|
template<>
|
|
struct hash<types::time_t> {
|
|
size_t operator() (const types::time_t& _Keyval) const noexcept {
|
|
return std::hash<unsigned int>()(_Keyval.ms) ^
|
|
std::hash<unsigned char>()(_Keyval.seconds) ^
|
|
std::hash<unsigned char>()(_Keyval.minutes) ^
|
|
std::hash<unsigned char>()(_Keyval.hours)
|
|
;
|
|
}
|
|
};
|
|
template<>
|
|
struct hash<types::timestamp_t>{
|
|
size_t operator() (const types::timestamp_t& _Keyval) const noexcept {
|
|
return std::hash<types::date_t>()(_Keyval.date) ^
|
|
std::hash<types::time_t>()(_Keyval.time);
|
|
}
|
|
};
|
|
|
|
}
|
|
|
|
inline size_t append_bytes(const astring_view& view) noexcept {
|
|
return append_bytes(view.str);
|
|
}
|
|
|
|
|
|
template <class ...Types>
|
|
struct hasher {
|
|
template <size_t i = 0> typename std::enable_if< i == sizeof...(Types),
|
|
size_t>::type hashi(const std::tuple<Types...>& record) const {
|
|
return 534235245539ULL;
|
|
}
|
|
|
|
template <size_t i = 0> typename std::enable_if< i < sizeof ...(Types),
|
|
size_t>::type hashi(const std::tuple<Types...>& record) const {
|
|
using current_type = typename std::decay<typename std::tuple_element<i, std::tuple<Types...>>::type>::type;
|
|
|
|
return std::hash<current_type>()(std::get<i>(record)) ^ hashi<i+1>(record);
|
|
}
|
|
size_t operator()(const std::tuple<Types...>& record) const {
|
|
return hashi(record);
|
|
}
|
|
};
|