log_tag_view.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 <compare>
#include <string>
#include <string_view>
 
#include "num_collect/logging/log_tag.h"
 
namespace num_collect::logging {
 
class log_tag_view {
public:
    constexpr explicit log_tag_view(std::string_view name) noexcept
        : name_(name) {}
 
    log_tag_view(const log_tag& tag) noexcept  // NOLINT
        : name_(tag.name()) {}
 
    explicit operator log_tag() const { return log_tag(name_); }
 
    [[nodiscard]] constexpr auto name() const noexcept -> std::string_view {
        return name_;
    }
 
    constexpr auto operator<=>(const log_tag_view& right) const noexcept
        -> std::strong_ordering {
        return this->name().compare(right.name()) <=> 0;
    }
 
    constexpr auto operator==(const log_tag_view& right) const noexcept
        -> bool {
        return this->name() == right.name();
    }
 
    constexpr auto operator!=(const log_tag_view& right) const noexcept
        -> bool = default;
 
private:
    std::string_view name_;
};
 
}  // namespace num_collect::logging