utf8_string.h

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/*
 * Copyright 2024 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 <cstddef>
#include <functional>
#include <ostream>
#include <string>
 
#include <fmt/base.h>
 
namespace stat_bench {
namespace util {

class Utf8String {
public:
    explicit Utf8String(std::string str);

    Utf8String() = default;

    [[nodiscard]] auto str() const noexcept -> const std::string&;
 
private:
    std::string str_;
};

[[nodiscard]] auto operator==(
    const Utf8String& lhs, const Utf8String& rhs) noexcept -> bool;

[[nodiscard]] auto operator!=(
    const Utf8String& lhs, const Utf8String& rhs) noexcept -> bool;

[[nodiscard]] auto operator<(
    const Utf8String& lhs, const Utf8String& rhs) noexcept -> bool;

[[nodiscard]] auto operator>(
    const Utf8String& lhs, const Utf8String& rhs) noexcept -> bool;

[[nodiscard]] auto operator<=(
    const Utf8String& lhs, const Utf8String& rhs) noexcept -> bool;

[[nodiscard]] auto operator>=(
    const Utf8String& lhs, const Utf8String& rhs) noexcept -> bool;
 
}  // namespace util
}  // namespace stat_bench
 
namespace fmt {

template <>
struct formatter<stat_bench::util::Utf8String> : public formatter<string_view> {
    auto format(const stat_bench::util::Utf8String& val,
        format_context& context) const -> format_context::iterator;
};
 
}  // namespace fmt
 
namespace stat_bench {
namespace util {

auto operator<<(std::ostream& stream, const Utf8String& val) -> std::ostream&;
 
}  // namespace util
}  // namespace stat_bench
 
namespace std {

template <>
class hash<stat_bench::util::Utf8String> {
public:
    auto operator()(const stat_bench::util::Utf8String& val) const
        -> std::size_t {
        return hash_(val.str());
    }
 
private:
    std::hash<std::string> hash_;
};
 
}  // namespace std