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