55 lines
1.5 KiB
C++
55 lines
1.5 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop version of Telegram messaging app, see https://telegram.org
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Telegram Desktop is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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It is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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In addition, as a special exception, the copyright holders give permission
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to link the code of portions of this program with the OpenSSL library.
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Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
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Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
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*/
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#pragma once
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namespace base {
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namespace functors {
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struct abs_helper {
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template <
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typename Type,
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typename = decltype(0 < std::declval<Type>()),
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typename = decltype(-std::declval<Type>())>
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constexpr Type operator()(Type value) const {
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return (0 < value) ? value : (-value);
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}
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};
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constexpr auto abs = abs_helper{};
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constexpr auto add = [](auto value) {
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return [value](auto other) {
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return value + other;
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};
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};
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struct negate_helper {
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template <
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typename Type,
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typename = decltype(-std::declval<Type>())>
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constexpr Type operator()(Type value) const {
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return -value;
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}
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};
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constexpr auto negate = negate_helper{};
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} // namespace functors
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} // namespace base
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