method_name_view.h

Go to the documentation of this file.

/*
 * Copyright 2023 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
 
// IWYU pragma: no_include <typeindex>
 
#include <cstddef>
#include <functional>
#include <string>
#include <string_view>
 
#include <fmt/base.h>
#include <fmt/format.h>
 
#include "msgpack_rpc/messages/method_name.h"
 
namespace msgpack_rpc::messages {

class MethodNameView {
public:
    MethodNameView(  // NOLINT(google-explicit-constructor, hicpp-explicit-conversions)
        const MethodName& name) noexcept
        : name_(name.name()) {
        // Validation is done in MethodName.
    }

    MethodNameView(  // NOLINT(google-explicit-constructor, hicpp-explicit-conversions)
        const std::string& name)
        : name_(name) {
        // TODO Add a validation of UTF-8.
    }

    MethodNameView(  // NOLINT(google-explicit-constructor, hicpp-explicit-conversions)
        std::string_view name)
        : name_(name) {
        // TODO Add a validation of UTF-8.
    }

    MethodNameView(const char* name, std::size_t size) : name_(name, size) {
        // TODO Add a validation of UTF-8.
    }

    MethodNameView(  // NOLINT(google-explicit-constructor, hicpp-explicit-conversions)
        const char* name)
        : name_(name) {
        // TODO Add a validation of UTF-8.
    }

    explicit operator MethodName() const { return MethodName(name_); }

    [[nodiscard]] std::string_view name() const noexcept { return name_; }
 
private:
    std::string_view name_;
};

[[nodiscard]] inline bool operator==(
    MethodNameView left, MethodNameView right) noexcept {
    return left.name() == right.name();
}

[[nodiscard]] inline bool operator!=(
    MethodNameView left, MethodNameView right) noexcept {
    return left.name() != right.name();
}
 
}  // namespace msgpack_rpc::messages
 
namespace fmt {

template <>
class formatter<msgpack_rpc::messages::MethodNameView>
    : public formatter<std::string_view> {
public:
    format_context::iterator format(
        const msgpack_rpc::messages::MethodNameView& val,
        format_context& context) const {
        return formatter<std::string_view>::format(val.name(), context);
    }
};
 
}  // namespace fmt
 
namespace std {

template <>
struct hash<msgpack_rpc::messages::MethodNameView> {
public:
    std::size_t operator()(
        const msgpack_rpc::messages::MethodNameView& value) const {
        return string_view_hash_(value.name());
    }
 
private:
    std::hash<std::string_view> string_view_hash_{};
};
 
}  // namespace std