42 lines
921 B
C++
42 lines
921 B
C++
/*
|
|
This file is part of Telegram Desktop,
|
|
the official desktop application for the Telegram messaging service.
|
|
|
|
For license and copyright information please follow this link:
|
|
https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
|
|
*/
|
|
#pragma once
|
|
|
|
namespace base {
|
|
namespace functors {
|
|
|
|
struct abs_helper {
|
|
template <
|
|
typename Type,
|
|
typename = decltype(0 < std::declval<Type>()),
|
|
typename = decltype(-std::declval<Type>())>
|
|
constexpr Type operator()(Type value) const {
|
|
return (0 < value) ? value : (-value);
|
|
}
|
|
};
|
|
constexpr auto abs = abs_helper{};
|
|
|
|
constexpr auto add = [](auto value) {
|
|
return [value](auto other) {
|
|
return value + other;
|
|
};
|
|
};
|
|
|
|
struct negate_helper {
|
|
template <
|
|
typename Type,
|
|
typename = decltype(-std::declval<Type>())>
|
|
constexpr Type operator()(Type value) const {
|
|
return -value;
|
|
}
|
|
};
|
|
constexpr auto negate = negate_helper{};
|
|
|
|
} // namespace functors
|
|
} // namespace base
|