msgpack/cpp11/tuple.hpp

//
// MessagePack for C++ static resolution routine
//
// Copyright (C) 2008-2013 FURUHASHI Sadayuki and KONDO Takatoshi
//
//    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.
//
#ifndef MSGPACK_TYPE_TUPLE_HPP
#define MSGPACK_TYPE_TUPLE_HPP

#include "msgpack/object.hpp"
#include <tuple>

namespace msgpack {
namespace type {

template <typename... Args>
using tuple = std::tuple<Args...>;

} // type

// --- Pack ( from tuple to packer stream ---
template <typename Stream, typename Tuple, std::size_t N>
struct Packer {
    static void pack(
		packer<Stream>& o,
		const Tuple& v) {
        Packer<Stream, Tuple, N-1>::pack(o, v);
        o.pack(std::get<N-1>(v));
    }
};

template <typename Stream, typename Tuple>
struct Packer<Stream, Tuple, 1> {
    static void pack (
		packer<Stream>& o,
		const Tuple& v) {
        o.pack(std::get<0>(v));
    }
};

template <typename Stream, typename... Args>
const packer<Stream>& operator<< (
    packer<Stream>& o,
    const type::tuple<Args...>& v) {
	o.pack_array(sizeof...(Args));
    Packer<Stream, decltype(v), sizeof...(Args)>::pack(o, v);
    return o;
}

// --- Convert from tuple to object ---

template <typename Tuple, std::size_t N>
struct Converter {
    static void convert(
        object o,
		Tuple& v) {
        Converter<Tuple, N-1>::convert(o, v);
        o.via.array.ptr[N-1].convert<typename std::remove_reference<decltype(std::get<N-1>(v))>::type>(&std::get<N-1>(v));
    }
};

template <typename Tuple>
struct Converter<Tuple, 1> {
    static void convert (
        object o,
		Tuple& v) {
        o.via.array.ptr[0].convert<typename std::remove_reference<decltype(std::get<0>(v))>::type>(&std::get<0>(v));
    }
};

template <typename... Args>
type::tuple<Args...>& operator>> (
    object o,
    type::tuple<Args...>& v) {
	if(o.type != type::ARRAY) { throw type_error(); }
	if(o.via.array.size < sizeof...(Args)) { throw type_error(); }
    Converter<decltype(v), sizeof...(Args)>::convert(o, v);
    return v;
}

// --- Convert from tuple to object with zone ---
template <typename Tuple, std::size_t N>
struct TupleToObjectWithZone {
    static void convert(
		object::with_zone& o,
		const Tuple& v) {
        TupleToObjectWithZone<Tuple, N-1>::convert(o, v);
        o.via.array.ptr[N-1] = object(std::get<N-1>(v), o.zone);
    }
};

template <typename Tuple>
struct TupleToObjectWithZone<Tuple, 1> {
    static void convert (
		object::with_zone& o,
		const Tuple& v) {
        o.via.array.ptr[0] = object(std::get<0>(v), o.zone);
    }
};

template <typename... Args>
inline void operator<< (
		object::with_zone& o,
        type::tuple<Args...>& v) {
	o.type = type::ARRAY;
	o.via.array.ptr = (object*)o.zone->malloc(sizeof(object)*sizeof...(Args));
	o.via.array.size = sizeof...(Args);
    TupleToObjectWithZone<decltype(v), sizeof...(Args)>::convert(o, v);
}

} // msgpack

#endif /* msgpack/type/tuple.hpp */