mirror of https://github.com/procxx/kepka.git
44 lines
1.4 KiB
C++
44 lines
1.4 KiB
C++
//
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// This file is part of Kepka,
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// an unofficial desktop version of Telegram messaging app,
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// see https://github.com/procxx/kepka
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//
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// Kepka 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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//
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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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//
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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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//
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// Full license: https://github.com/procxx/kepka/blob/master/LICENSE
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// Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
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// Copyright (c) 2017- Kepka Contributors, https://github.com/procxx
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//
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#pragma once
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#include <utility>
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namespace base {
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namespace functors {
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struct abs_helper {
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template <typename Type, typename = decltype(0 < std::declval<Type>()), 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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template <typename Type> inline auto add(Type a) {
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return [a](auto b) { return a + b; };
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};
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} // namespace functors
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} // namespace base
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