iterative_solver_base.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/logging/iterations/iteration_logger_mixin.h"
#include "num_collect/logging/log_tag_view.h"
#include "num_collect/logging/logging_mixin.h"
 
namespace num_collect {
inline namespace base {
 
template <typename Derived>
class iterative_solver_base
    : public logging::logging_mixin,
      public logging::iterations::iteration_logger_mixin<Derived> {
public:
    explicit iterative_solver_base(logging::log_tag_view tag)
        : logging::logging_mixin(tag) {
        this->logger().set_iterative();
    }
 
    void iterate() { derived().iterate(); }
 
    [[nodiscard]] auto is_stop_criteria_satisfied() const -> bool {
        return derived().is_stop_criteria_satisfied();
    }
 
    void solve() {
        auto& iter_logger = this->initialize_iteration_logger();
        iter_logger.write_iteration(&derived());
        while (!is_stop_criteria_satisfied()) {
            iterate();
            iter_logger.write_iteration(&derived());
        }
        iter_logger.write_summary(&derived());
    }
 
protected:
    [[nodiscard]] auto derived() noexcept -> Derived& {
        return *static_cast<Derived*>(this);
    }
 
    [[nodiscard]] auto derived() const noexcept -> const Derived& {
        return *static_cast<const Derived*>(this);
    }
};
 
}  // namespace base
}  // namespace num_collect