function.h

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/*
 * Copyright 2021 MusicScience37 (Kenta Kabashima)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#pragma once
 
#include <utility>
 
#include "num_collect/base/concepts/const_reference_of.h"
 
namespace num_collect::roots::concepts {
 
template <typename T>
concept function = requires(const T& const_obj, T& obj) {
    typename T::variable_type;
 
    { obj.evaluate_on(std::declval<typename T::variable_type>()) };
    {
        const_obj.value()
    } -> base::concepts::const_reference_of<typename T::variable_type>;
};
 
}  // namespace num_collect::roots::concepts