Chris@16: // (C) Copyright 2005-2007 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_BINARY_BUFFER_IPRIMITIVE_HPP
Chris@16: #define BOOST_MPI_BINARY_BUFFER_IPRIMITIVE_HPP
Chris@16: 
Chris@16: #include <mpi.h>
Chris@16: #include <iostream>
Chris@16: #include <cstddef> // size_t
Chris@16: #include <boost/config.hpp>
Chris@16: #include <boost/mpi/exception.hpp>
Chris@16: #include <boost/assert.hpp>
Chris@16: #include <boost/mpl/assert.hpp>
Chris@16: #include <boost/serialization/array.hpp>
Chris@16: #include <boost/serialization/is_bitwise_serializable.hpp>
Chris@16: #include <vector>
Chris@16: #include <boost/mpi/allocator.hpp>
Chris@16: #include <cstring> // for memcpy
Chris@16: #include <cassert>
Chris@16: 
Chris@16: namespace boost { namespace mpi {
Chris@16: 
Chris@16: /// deserialization using MPI_Unpack
Chris@16: 
Chris@16: class BOOST_MPI_DECL binary_buffer_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:     binary_buffer_iprimitive(buffer_type & b, MPI_Comm const &, int position = 0)
Chris@16:      : buffer_(b),
Chris@16:        position(position)
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16:     void* address ()
Chris@16:     {
Chris@16:       return &buffer_.front();
Chris@16:     }
Chris@16: 
Chris@16:     void const* address () const
Chris@16:     {
Chris@16:       return &buffer_.front();
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,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:       BOOST_MPL_ASSERT((serialization::is_bitwise_serializable<BOOST_DEDUCED_TYPENAME remove_const<T>::type>));
Chris@16:       if (x.count())
Chris@16:         load_impl(x.address(), sizeof(T)*x.count());
Chris@16:     }
Chris@16: 
Chris@16:     typedef serialization::is_bitwise_serializable<mpl::_1> use_array_optimization;
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:     // default saving of primitives.
Chris@16:     template<class T>
Chris@16:     void load( T & t)
Chris@16:     {
Chris@16:       BOOST_MPL_ASSERT((serialization::is_bitwise_serializable<BOOST_DEDUCED_TYPENAME remove_const<T>::type>));
Chris@16:       load_impl(&t, sizeof(T));
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:       // borland de-allocator fixup
Chris@16:       #if BOOST_WORKAROUND(_RWSTD_VER, BOOST_TESTED_AT(20101))
Chris@16:       if(NULL != s.data())
Chris@16:       #endif
Chris@16:       s.resize(l);
Chris@16:       // note breaking a rule here - could be a problem on some platform
Chris@16:       load_impl(const_cast<char *>(s.data()),l);
Chris@16:     }
Chris@16: 
Chris@16: private:
Chris@16: 
Chris@16:     void load_impl(void * p, int l)
Chris@16:     {
Chris@16:       assert(position+l<=static_cast<int>(buffer_.size()));
Chris@16:       if (l)
Chris@16:         std::memcpy(p,&buffer_[position],l);
Chris@16:       position += l;
Chris@16:     }
Chris@16: 
Chris@16:     buffer_type & buffer_;
Chris@16:     mutable std::size_t size_;
Chris@16:     int position;
Chris@16: };
Chris@16: 
Chris@16: } } // end namespace boost::mpi
Chris@16: 
Chris@16: #endif // BOOST_MPI_PACKED_IPRIMITIVE_HPP