156 lines
4.6 KiB
C++
156 lines
4.6 KiB
C++
/*
|
|
This file is part of Telegram Desktop,
|
|
the official desktop version of Telegram messaging app, see https://telegram.org
|
|
|
|
Telegram Desktop is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
It is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
In addition, as a special exception, the copyright holders give permission
|
|
to link the code of portions of this program with the OpenSSL library.
|
|
|
|
Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
|
|
Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
|
|
*/
|
|
#pragma once
|
|
|
|
namespace base {
|
|
namespace details {
|
|
|
|
template <
|
|
typename Type,
|
|
typename Operator,
|
|
typename = decltype(Operator{}(
|
|
std::declval<Type>(),
|
|
std::declval<Type>()))>
|
|
char test_operator(const Type &, const Operator &);
|
|
int test_operator(...);
|
|
|
|
template <typename Type, template <typename> typename Operator>
|
|
struct has_operator
|
|
: std::bool_constant<
|
|
sizeof(test_operator(
|
|
std::declval<Type>(),
|
|
std::declval<Operator<Type>>()
|
|
)) == sizeof(char)> {
|
|
};
|
|
|
|
template <
|
|
typename Type,
|
|
template <typename> typename Operator>
|
|
constexpr bool has_operator_v
|
|
= has_operator<Type, Operator>::value;
|
|
|
|
template <typename Type>
|
|
constexpr bool has_less_v = has_operator_v<Type, std::less>;
|
|
|
|
template <typename Type>
|
|
constexpr bool has_greater_v = has_operator_v<Type, std::greater>;
|
|
|
|
template <typename Type>
|
|
constexpr bool has_less_equal_v = has_operator_v<Type, std::less_equal>;
|
|
|
|
template <typename Type>
|
|
constexpr bool has_greater_equal_v = has_operator_v<Type, std::greater_equal>;
|
|
|
|
template <typename Type>
|
|
constexpr bool has_equal_to_v = has_operator_v<Type, std::equal_to>;
|
|
|
|
template <typename Type>
|
|
constexpr bool has_not_equal_to_v = has_operator_v<Type, std::not_equal_to>;
|
|
|
|
} // namespace details
|
|
} // namespace base
|
|
|
|
template <
|
|
typename ValueType,
|
|
typename Helper = decltype(
|
|
value_ordering_helper(std::declval<ValueType>()))>
|
|
inline auto operator<(const ValueType &a, const ValueType &b)
|
|
-> std::enable_if_t<base::details::has_less_v<Helper>, bool> {
|
|
return value_ordering_helper(a) < value_ordering_helper(b);
|
|
}
|
|
|
|
template <
|
|
typename ValueType,
|
|
typename Helper = decltype(
|
|
value_ordering_helper(std::declval<ValueType>()))>
|
|
inline auto operator>(const ValueType &a, const ValueType &b)
|
|
-> std::enable_if_t<
|
|
base::details::has_greater_v<Helper>
|
|
|| base::details::has_less_v<Helper>,
|
|
bool
|
|
> {
|
|
if constexpr (base::details::has_greater_v<Helper>) {
|
|
return value_ordering_helper(a) > value_ordering_helper(b);
|
|
} else {
|
|
return value_ordering_helper(b) < value_ordering_helper(a);
|
|
}
|
|
}
|
|
|
|
template <
|
|
typename ValueType,
|
|
typename Helper = decltype(
|
|
value_ordering_helper(std::declval<ValueType>()))>
|
|
inline auto operator<=(const ValueType &a, const ValueType &b)
|
|
-> std::enable_if_t<
|
|
base::details::has_less_equal_v<Helper>
|
|
|| base::details::has_less_v<Helper>,
|
|
bool
|
|
> {
|
|
if constexpr (base::details::has_less_equal_v<Helper>) {
|
|
return value_ordering_helper(a) <= value_ordering_helper(b);
|
|
} else {
|
|
return !(value_ordering_helper(b) < value_ordering_helper(a));
|
|
}
|
|
}
|
|
|
|
template <
|
|
typename ValueType,
|
|
typename Helper = decltype(
|
|
value_ordering_helper(std::declval<ValueType>()))>
|
|
inline auto operator>=(const ValueType &a, const ValueType &b)
|
|
-> std::enable_if_t<
|
|
base::details::has_greater_equal_v<Helper>
|
|
|| base::details::has_less_v<Helper>,
|
|
bool
|
|
> {
|
|
if constexpr (base::details::has_greater_equal_v<Helper>) {
|
|
return value_ordering_helper(a) >= value_ordering_helper(b);
|
|
} else {
|
|
return !(value_ordering_helper(a) < value_ordering_helper(b));
|
|
}
|
|
}
|
|
|
|
template <
|
|
typename ValueType,
|
|
typename Helper = decltype(
|
|
value_ordering_helper(std::declval<ValueType>()))>
|
|
inline auto operator==(const ValueType &a, const ValueType &b)
|
|
-> std::enable_if_t<base::details::has_equal_to_v<Helper>, bool> {
|
|
return value_ordering_helper(a) == value_ordering_helper(b);
|
|
}
|
|
|
|
template <
|
|
typename ValueType,
|
|
typename Helper = decltype(
|
|
value_ordering_helper(std::declval<ValueType>()))>
|
|
inline auto operator!=(const ValueType &a, const ValueType &b)
|
|
-> std::enable_if_t<
|
|
base::details::has_not_equal_to_v<Helper>
|
|
|| base::details::has_equal_to_v<Helper>,
|
|
bool
|
|
> {
|
|
if constexpr (base::details::has_not_equal_to_v<Helper>) {
|
|
return value_ordering_helper(a) != value_ordering_helper(b);
|
|
} else {
|
|
return !(value_ordering_helper(a) == value_ordering_helper(b));
|
|
}
|
|
}
|