Chris@16: // (C) Copyright 2005 Matthias Troyer
Chris@16: 
Chris@16: // Use, modification and distribution is subject to the Boost Software
Chris@16: // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: //  Authors: Matthias Troyer
Chris@16: 
Chris@16: #ifndef BOOST_MPI_PACKED_IPRIMITIVE_HPP
Chris@16: #define BOOST_MPI_PACKED_IPRIMITIVE_HPP
Chris@16: 
Chris@16: #include <boost/mpi/config.hpp>
Chris@16: #include <cstddef> // size_t
Chris@16: #include <boost/config.hpp>
Chris@16: #include <boost/mpi/datatype.hpp>
Chris@16: #include <boost/mpi/exception.hpp>
Chris@16: #include <boost/assert.hpp>
Chris@16: #include <boost/serialization/array.hpp>
Chris@16: #include <boost/serialization/detail/get_data.hpp>
Chris@16: #include <vector>
Chris@16: #include <boost/mpi/allocator.hpp>
Chris@16: 
Chris@16: namespace boost { namespace mpi {
Chris@16: 
Chris@16: /// deserialization using MPI_Unpack
Chris@16: 
Chris@16: class BOOST_MPI_DECL packed_iprimitive
Chris@16: {
Chris@16: public:
Chris@16:     /// the type of the buffer from which the data is unpacked upon deserialization
Chris@16:     typedef std::vector<char, allocator<char> > buffer_type;
Chris@16: 
Chris@16:     packed_iprimitive(buffer_type & b, MPI_Comm const & comm, int position = 0)
Chris@16:          : buffer_(b),
Chris@16:            comm(comm),
Chris@16:            position(position)
Chris@16:         {
Chris@16:         }
Chris@16: 
Chris@16:     void* address ()
Chris@16:     {
Chris@16:       return &buffer_[0];
Chris@16:     }
Chris@16: 
Chris@16:     void const* address () const
Chris@16:     {
Chris@16:       return &buffer_[0];
Chris@16:     }
Chris@16: 
Chris@16:     const std::size_t& size() const
Chris@16:     {
Chris@16:       return size_ = buffer_.size();
Chris@16:     }
Chris@16: 
Chris@16:     void resize(std::size_t s)
Chris@16:     {
Chris@16:       buffer_.resize(s);
Chris@16:     }
Chris@16: 
Chris@16:     void load_binary(void *address, std::size_t count)
Chris@16:         {
Chris@16:           load_impl(address,MPI_BYTE,count);
Chris@16:         }
Chris@16: 
Chris@16:     // fast saving of arrays of fundamental types
Chris@16:     template<class T>
Chris@16:     void load_array(serialization::array<T> const& x, unsigned int /* file_version */)
Chris@16:     {
Chris@16:       if (x.count())
Chris@16:         load_impl(x.address(), get_mpi_datatype(*x.address()), x.count());
Chris@16:     }
Chris@16: 
Chris@16: /*
Chris@16:     template<class T>
Chris@16:     void load(serialization::array<T> const& x)
Chris@16:     {
Chris@16:       load_array(x,0u);
Chris@16:     }
Chris@16: */
Chris@16: 
Chris@16:     typedef is_mpi_datatype<mpl::_1> use_array_optimization;
Chris@16: 
Chris@16:     // default saving of primitives.
Chris@16:     template<class T>
Chris@16:     void load( T & t)
Chris@16:     {
Chris@16:       load_impl(&t, get_mpi_datatype(t), 1);
Chris@16:     }
Chris@16: 
Chris@16:     template<class CharType>
Chris@16:     void load(std::basic_string<CharType> & s)
Chris@16:     {
Chris@16:         unsigned int l;
Chris@16:         load(l);
Chris@16:         s.resize(l);
Chris@16:         // note breaking a rule here - could be a problem on some platform
Chris@16:         if (l)
Chris@16:           load_impl(const_cast<CharType *>(s.data()),
Chris@16:                     get_mpi_datatype(CharType()),l);
Chris@16:     }
Chris@16: 
Chris@16: private:
Chris@16: 
Chris@16:     void load_impl(void * p, MPI_Datatype t, int l)
Chris@16:     {
Chris@16:       BOOST_MPI_CHECK_RESULT(MPI_Unpack,
Chris@16:         (const_cast<char*>(boost::serialization::detail::get_data(buffer_)), buffer_.size(), &position, p, l, t, comm));
Chris@16:     }
Chris@16: 
Chris@16:     buffer_type & buffer_;
Chris@16:     mutable std::size_t size_;
Chris@16:     MPI_Comm comm;
Chris@16:     int position;
Chris@16: };
Chris@16: 
Chris@16: } } // end namespace boost::mpi
Chris@16: 
Chris@16: #endif // BOOST_MPI_PACKED_IPRIMITIVE_HPP