functional.h - mozsearch

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// Copyright 2020 The Chromium Authors

// Use of this source code is governed by a BSD-style license that can be

// found in the LICENSE file.

#ifndef BASE_RANGES_FUNCTIONAL_H_

#define BASE_RANGES_FUNCTIONAL_H_

#include <functional>

#include <type_traits>

#include <utility>

namespace base {

namespace ranges {

// Simplified implementations of C++20's std::ranges comparison function

// objects. As opposed to the std::ranges implementation, these versions do not

// constrain the passed-in types.

//

// Reference: https://wg21.link/range.cmp

using equal_to = std::equal_to<>;

using not_equal_to = std::not_equal_to<>;

using greater = std::greater<>;

using less = std::less<>;

using greater_equal = std::greater_equal<>;

using less_equal = std::less_equal<>;

}  // namespace ranges

}  // namespace base

#endif  // BASE_RANGES_FUNCTIONAL_H_