iteration_logger_mixin.h

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/*
 * Copyright 2022 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 <optional>
 
#include "num_collect/logging/iterations/iteration_logger.h"
 
namespace num_collect::logging::iterations {
 
template <typename Derived>
class iteration_logger_mixin {
public:
    iteration_logger_mixin() = default;
 
    void configure_iteration_logger(
        num_collect::logging::iterations::iteration_logger<Derived>&
            iteration_logger) const {
        static_cast<const Derived*>(this)->configure_iteration_logger(
            iteration_logger);
    }
 
    auto initialize_iteration_logger()
        -> num_collect::logging::iterations::iteration_logger<Derived>& {
        if (iteration_logger_) {
            iteration_logger_->start(static_cast<Derived*>(this)->logger());
        } else {
            iteration_logger_.emplace(static_cast<Derived*>(this)->logger());
            configure_iteration_logger(*iteration_logger_);
        }
        return *iteration_logger_;
    }
 
private:
    std::optional<num_collect::logging::iterations::iteration_logger<Derived>>
        iteration_logger_{};
};
 
}  // namespace num_collect::logging::iterations