stack_constructor.hpp

来自「Boost provides free peer-reviewed portab」· HPP 代码 · 共 74 行

#ifndef  BOOST_SERIALIZATION_DETAIL_STACH_CONSTRUCTOR_HPP
#define BOOST_SERIALIZATION_DETAIL_STACH_CONSTRUCTOR_HPP

// MS compatible compilers support #pragma once
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif

#if defined(_MSC_VER) && (_MSC_VER <= 1020)
#  pragma warning (disable : 4786) // too long name, harmless warning
#endif

/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
// collections_load_imp.hpp: serialization for loading stl collections

// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . 
// Use, modification and distribution is subject to 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)

//  See http://www.boost.org for updates, documentation, and revision history.

#include <boost/aligned_storage.hpp>

namespace boost{
namespace serialization {
namespace detail {

// reserve space on stack for an object of type T without actually
// construction such an object
template<typename T > 
struct stack_allocate
{
    T * address() {
        return static_cast<T*>(storage_.address()); 
    }
    T & reference() {
        return * address();
    }
private:
    typedef BOOST_DEDUCED_TYPENAME boost::aligned_storage<
        sizeof(T), 
        #if BOOST_WORKAROUND(__BORLANDC__,BOOST_TESTED_AT(0x560))
            8
        #else
            boost::alignment_of<T>::value
        #endif
    > type;
    type storage_;
};

// construct element on the stack
template<class Archive, class T>
struct stack_construct : public stack_allocate<T>
{
    stack_construct(Archive & ar, const unsigned int version){
        // note borland emits a no-op without the explicit namespace
        boost::serialization::load_construct_data_adl(
            ar, 
            this->address(), 
            version
        );
    }
    ~stack_construct(){
        this->address()->~T(); // undo load_construct_data above
    }
};

} // detail
} // serializaition
} // boost

#endif //  BOOST_SERIALIZATION_DETAIL_STACH_CONSTRUCTOR_HPP