problem.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 "num_collect/base/concepts/const_reference_of.h"
#include "num_collect/base/concepts/decayed_to.h"
#include "num_collect/base/concepts/real_scalar.h"
#include "num_collect/ode/evaluation_type.h"
 
namespace num_collect::ode::concepts {

template <typename T>
concept problem = requires(T& obj, const T& const_obj) {
    typename T::variable_type;
    typename T::scalar_type;
 
    requires base::concepts::real_scalar<typename T::scalar_type>;
    requires requires(typename T::variable_type& var,
        const typename T::scalar_type& coeff) { var = var + coeff * var; };
 
    { T::allowed_evaluations } -> base::concepts::decayed_to<evaluation_type>;
    requires T::allowed_evaluations.allows(evaluation_type{.diff_coeff = true});
 
    requires requires(const typename T::scalar_type& time,
        const typename T::variable_type& var, evaluation_type evaluations) {
        obj.evaluate_on(time, var, evaluations);
    };
 
    {
        const_obj.diff_coeff()
    } -> base::concepts::const_reference_of<typename T::variable_type>;
};
 
}  // namespace num_collect::ode::concepts