41 lines
921 B
C++
41 lines
921 B
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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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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