method_exception.h

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/*
 * 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
 
#include <exception>
#include <memory>
#include <type_traits>
#include <utility>
 
#include <msgpack.hpp>
 
#include "msgpack_rpc/impl/msgpack_rpc_export.h"
 
namespace msgpack_rpc::methods {

class MSGPACK_RPC_EXPORT MethodException : public std::exception {
public:
    // Exceptions must be exported in libraries. If not exported, exceptions
    // cannot be caught correctly.

    template <typename T>
    explicit MethodException(T&& object,
        std::enable_if_t<!std::is_same_v<std::decay_t<T>, MethodException>,
            void*> /*for SFINAE*/
        = nullptr)
        : zone_(std::make_shared<msgpack::zone>()),
          object_(std::forward<T>(object), *zone_) {}

    [[nodiscard]] const msgpack::object& object() const noexcept;

    [[nodiscard]] const char* what() const noexcept override;

    MethodException(const MethodException&) noexcept;

    MethodException(MethodException&&) noexcept;

    MethodException& operator=(const MethodException&) noexcept;

    MethodException& operator=(MethodException&&) noexcept;

    ~MethodException() noexcept override;
 
private:
    std::shared_ptr<msgpack::zone> zone_;

    msgpack::object object_;
};
 
}  // namespace msgpack_rpc::methods