flyweight/detail/archive_constructed.hpp

0001 /* Copyright 2006-2020 Joaquin M Lopez Munoz.
0002  * Distributed under the Boost Software License, Version 1.0.
0003  * (See accompanying file LICENSE_1_0.txt or copy at
0004  * http://www.boost.org/LICENSE_1_0.txt)
0005  *
0006  * See http://www.boost.org/libs/flyweight for library home page.
0007  */
0008
0009 #ifndef BOOST_FLYWEIGHT_DETAIL_ARCHIVE_CONSTRUCTED_HPP
0010 #define BOOST_FLYWEIGHT_DETAIL_ARCHIVE_CONSTRUCTED_HPP
0011
0012 #if defined(_MSC_VER)&&(_MSC_VER>=1200)
0013 #pragma once
0014 #endif
0015
0016 #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
0017 #include <boost/core/no_exceptions_support.hpp>
0018 #include <boost/noncopyable.hpp>
0019 #include <boost/core/serialization.hpp>
0020 #include <boost/type_traits/aligned_storage.hpp>
0021 #include <boost/type_traits/alignment_of.hpp>
0022
0023 namespace boost{
0024
0025 namespace flyweights{
0026
0027 namespace detail{
0028
0029 /* constructs a stack-based object from a serialization archive */
0030
0031 template<typename T>
0032 struct archive_constructed:private noncopyable
0033 {
0034   template<class Archive>
0035   archive_constructed(Archive& ar,const unsigned int version)
0036   {
0037     core::load_construct_data_adl(ar,&get(),version);
0038     BOOST_TRY{
0039       ar>>get();
0040     }
0041     BOOST_CATCH(...){
0042       (&get())->~T();
0043       BOOST_RETHROW;
0044     }
0045     BOOST_CATCH_END
0046   }
0047
0048   template<class Archive>
0049   archive_constructed(const char* name,Archive& ar,const unsigned int version)
0050   {
0051     core::load_construct_data_adl(ar,&get(),version);
0052     BOOST_TRY{
0053       ar>>serialization::make_nvp(name,get());
0054     }
0055     BOOST_CATCH(...){
0056       (&get())->~T();
0057       BOOST_RETHROW;
0058     }
0059     BOOST_CATCH_END
0060   }
0061
0062   ~archive_constructed()
0063   {
0064     (&get())->~T();
0065   }
0066
0067   T& get(){return *static_cast<T*>(static_cast<void*>(&space));}
0068
0069 private:
0070   typename aligned_storage<sizeof(T),alignment_of<T>::value>::type space;
0071 };
0072
0073 } /* namespace flyweights::detail */
0074
0075 } /* namespace flyweights */
0076
0077 } /* namespace boost */
0078
0079 #endif