archive_constructed.hpp

C++的一个好库。。。现在很流行

/* Copyright 2003-2005 Joaqu韓 M L髉ez Mu駉z.
 * 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)
 *
 * See http://www.boost.org/libs/multi_index for library home page.
 */

#ifndef BOOST_MULTI_INDEX_DETAIL_ARCHIVE_CONSTRUCTED_HPP
#define BOOST_MULTI_INDEX_DETAIL_ARCHIVE_CONSTRUCTED_HPP

#if defined(_MSC_VER)&&(_MSC_VER>=1200)
#pragma once
#endif

#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
#include <boost/aligned_storage.hpp>
#include <boost/detail/no_exceptions_support.hpp>
#include <boost/noncopyable.hpp>
#include <boost/serialization/serialization.hpp>

namespace boost{

namespace multi_index{

namespace detail{

/* constructs a stack-based object from a serialization archive */

template<typename T>
struct archive_constructed:private noncopyable
{
  template<class Archive>
  archive_constructed(Archive& ar,const unsigned int version)
  {
    serialization::load_construct_data_adl(ar,&get(),version);
    BOOST_TRY{
      ar>>get();
    }
    BOOST_CATCH(...){
      (&get())->~T();
      BOOST_RETHROW;
    }
    BOOST_CATCH_END
  }

  template<class Archive>
  archive_constructed(const char* name,Archive& ar,const unsigned int version)
  {
    serialization::load_construct_data_adl(ar,&get(),version);
    BOOST_TRY{
      ar>>serialization::make_nvp(name,get());
    }
    BOOST_CATCH(...){
      (&get())->~T();
      BOOST_RETHROW;
    }
    BOOST_CATCH_END
  }

  ~archive_constructed()
  {
    (&get())->~T();
  }

  T& get(){return *static_cast<T*>(space.address());}

private:
  aligned_storage<sizeof(T)> space;
};

} /* namespace multi_index::detail */

} /* namespace multi_index */

} /* namespace boost */

#endif