property_map/parallel/unsafe_serialize.hpp

0001 // Copyright (C) 2006 The Trustees of Indiana University.
0002
0003 // Use, modification and distribution is subject to the Boost Software
0004 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
0005 // http://www.boost.org/LICENSE_1_0.txt)
0006
0007 //  Authors: Douglas Gregor
0008 //           Andrew Lumsdaine
0009
0010 // This file contains the "unsafe_serialize" routine, which transforms
0011 // types they may not be serializable (such as void*) into
0012 // serializable equivalents.
0013 #ifndef BOOST_PROPERTY_MAP_UNSAFE_SERIALIZE_HPP
0014 #define BOOST_PROPERTY_MAP_UNSAFE_SERIALIZE_HPP
0015
0016 #include <boost/mpi/datatype.hpp>
0017 #include <boost/serialization/is_bitwise_serializable.hpp>
0018 #include <boost/mpl/bool.hpp>
0019 #include <boost/mpl/if.hpp>
0020 #include <boost/cstdint.hpp>
0021 #include <boost/static_assert.hpp>
0022 #include <boost/type_traits.hpp>
0023 #include <utility>
0024
0025 BOOST_IS_BITWISE_SERIALIZABLE(void*)
0026 namespace boost { namespace mpi {
0027     template<> struct is_mpi_datatype<void*> : mpl::true_ { };
0028 } } // end namespace boost::mpi
0029
0030 namespace boost {
0031   typedef mpl::if_c<(sizeof(int) == sizeof(void*)),
0032                     int,
0033                     mpl::if_c<(sizeof(long) == sizeof(void*)),
0034                               long,
0035                               mpl::if_c<(sizeof(void*) <= sizeof(boost::intmax_t)),
0036                                         boost::intmax_t,
0037                                         void>::type
0038                               >::type
0039                     >::type ptr_serialize_type;
0040
0041   BOOST_STATIC_ASSERT ((!boost::is_void<ptr_serialize_type>::value));
0042
0043   template<typename T> inline T& unsafe_serialize(T& x) { return x; }
0044
0045   inline ptr_serialize_type& unsafe_serialize(void*& x)
0046   { return reinterpret_cast<ptr_serialize_type&>(x); }
0047
0048   // Force Boost.MPI to serialize a void* like a ptr_serialize_type
0049   namespace mpi {
0050     template<> inline MPI_Datatype get_mpi_datatype<void*>(void* const& x)
0051     {
0052       return get_mpi_datatype<ptr_serialize_type>();
0053     }
0054   }
0055
0056   template<typename T, typename U>
0057   struct unsafe_pair
0058   {
0059     unsafe_pair() { }
0060     unsafe_pair(const T& t, const U& u) : first(t), second(u) { }
0061     unsafe_pair(const std::pair<T, U>& p) : first(p.first), second(p.second) { }
0062     T first;
0063     U second;
0064
0065     template<typename Archiver>
0066     void serialize(Archiver& ar, const unsigned /*version*/)
0067     {
0068       ar & unsafe_serialize(first) & unsafe_serialize(second);
0069     }
0070   };
0071
0072   template<typename T, typename U>
0073   bool operator<(unsafe_pair<T,U> const& x, unsafe_pair<T,U> const& y)
0074   {
0075     return std::make_pair(x.first, x.second) <
0076       std::make_pair(y.first, y.second);
0077   }
0078
0079 } // end namespace boost
0080
0081 #endif // BOOST_PROPERTY_MAP_UNSAFE_SERIALIZE_HPP