object_fwd.hpp

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//
// MessagePack for C++ static resolution routine
//
// Copyright (C) 2008-2014 FURUHASHI Sadayuki and KONDO Takatoshi
//
//    Distributed under the Boost Software License, Version 1.0.
//    (See accompanying file LICENSE_1_0.txt or copy at
//    http://www.boost.org/LICENSE_1_0.txt)
//

#ifndef MSGPACK_V1_OBJECT_FWD_HPP
#define MSGPACK_V1_OBJECT_FWD_HPP

#include "msgpack/object_fwd_decl.hpp"

namespace msgpack {

MSGPACK_API_VERSION_NAMESPACE(v1) {

struct object_array {
    uint32_t size;
    msgpack::object* ptr;
};

struct object_map {
    uint32_t size;
    msgpack::object_kv* ptr;
};

struct object_str {
    uint32_t size;
    const char* ptr;
};

struct object_bin {
    uint32_t size;
    const char* ptr;
};

struct object_ext {
    int8_t type() const { return ptr[0]; }
    const char* data() const { return &ptr[1]; }
    uint32_t size;
    const char* ptr;
};


#if !defined(MSGPACK_USE_CPP03)

template <typename T>
struct has_as {
private:
    template <typename U>
    static auto check(U*) ->
        // Check v1 specialization
        typename std::is_same<
            decltype(adaptor::as<U>()(std::declval<msgpack::object>())),
            T
        >::type;
    template <typename>
    static std::false_type check(...);
public:
    using type = decltype(check<T>(nullptr));
    static constexpr bool value = type::value;
};

#endif // !defined(MSGPACK_USE_CPP03)


struct object {
    union union_type {
        bool boolean;
        uint64_t u64;
        int64_t  i64;
#if defined(MSGPACK_USE_LEGACY_NAME_AS_FLOAT)
        double   dec; // obsolete
#endif // MSGPACK_USE_LEGACY_NAME_AS_FLOAT
        double   f64;
        msgpack::object_array array;
        msgpack::object_map map;
        msgpack::object_str str;
        msgpack::object_bin bin;
        msgpack::object_ext ext;
    };

    msgpack::type::object_type type;
    union_type via;


    bool is_nil() const { return type == msgpack::type::NIL; }

#if defined(MSGPACK_USE_CPP03)


    template <typename T>
    T as() const;

#else  // defined(MSGPACK_USE_CPP03)


    template <typename T>
    typename std::enable_if<msgpack::has_as<T>::value, T>::type as() const;


    template <typename T>
    typename std::enable_if<!msgpack::has_as<T>::value, T>::type as() const;

#endif // defined(MSGPACK_USE_CPP03)


    template <typename T>
    T& convert(T& v) const;


#if !defined(MSGPACK_DISABLE_LEGACY_CONVERT)

    template <typename T>
    T* convert(T* v) const;
#endif // !defined(MSGPACK_DISABLE_LEGACY_CONVERT)


    template <typename T>
    bool convert_if_not_nil(T& v) const;

    object();

    object(const msgpack_object& o);


    template <typename T>
    explicit object(const T& v);


    template <typename T>
    object(const T& v, msgpack::zone& z);


    template <typename T>
    object(const T& v, msgpack::zone* z);

    template <typename T>
    object& operator=(const T& v);

    operator msgpack_object() const;

    struct with_zone;

protected:
    struct implicit_type;

public:
    implicit_type convert() const;
};

class type_error : public std::bad_cast { };

struct object::implicit_type {
    implicit_type(object const& o) : obj(o) { }
    ~implicit_type() { }

    template <typename T>
    operator T();

private:
    object const& obj;
};

} // MSGPACK_API_VERSION_NAMESPACE(v1)

} // namespace msgpack

#endif // MSGPACK_V1_OBJECT_FWD_HPP