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