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