synth_three_way.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2021 Tobias Hienzsch
 
#ifndef TETL_COMPARE_SYNTH_THREE_WAY_HPP
#define TETL_COMPARE_SYNTH_THREE_WAY_HPP
 
#include <etl/_compare/weak_ordering.hpp>
#include <etl/_concepts/boolean_testable.hpp>
#include <etl/_type_traits/declval.hpp>
 
namespace etl {
 
// // clang-format off
// inline constexpr auto synth_three_way =
//   []<typename T, typename U>(T const& t, U const& u)
//     requires requires {
//       { t < u } -> boolean_testable;
//       { u < t } -> boolean_testable;
//     }
//   {
//     if constexpr (three_way_comparable_with<T, U>) {
//       return t <=> u;
//     } else {
//       if (t < u) { return weak_ordering::less; }
//       if (u < t) { return weak_ordering::greater; }
//       return weak_ordering::equivalent;
//     }
//   };
// // clang-format on
 
// template <typename T, typename U = T>
// using synth_three_way_result
//     = decltype(synth_three_way(declval<T&>(), declval<U&>()));
 
} // namespace etl
 
#endif // TETL_COMPARE_SYNTH_THREE_WAY_HPP