afb81b8278
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41 lines
920 B
C++
41 lines
920 B
C++
// This file is part of Desktop App Toolkit,
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// a set of libraries for developing nice desktop applications.
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//
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// For license and copyright information please follow this link:
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// https://github.com/desktop-app/legal/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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