//
// This file is part of Kepka,
// an unofficial desktop version of Telegram messaging app,
// see https://github.com/procxx/kepka
//
// Kepka 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/procxx/kepka/blob/master/LICENSE
// Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
// Copyright (c) 2017- Kepka Contributors, https://github.com/procxx
//
#pragma once

#include <utility>

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