43 lines
1.3 KiB
C++
43 lines
1.3 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 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 {};
|
|
|
|
template <typename Type>
|
|
inline auto add(Type a) {
|
|
return [a](auto b) { return a + b; };
|
|
};
|
|
|
|
} // namespace functors
|
|
} // namespace base
|