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114 lines
2.9 KiB
114 lines
2.9 KiB
// (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_OPRIMITIVE_HPP |
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#define BOOST_MPI_PACKED_OPRIMITIVE_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/serialization/detail/get_data.hpp> |
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#include <boost/serialization/array.hpp> |
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#include <boost/assert.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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/// serialization using MPI::Pack |
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class BOOST_MPI_DECL packed_oprimitive |
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{ |
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public: |
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/// the type of the buffer into which the data is packed upon serialization |
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typedef std::vector<char, allocator<char> > buffer_type; |
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packed_oprimitive(buffer_type & b, MPI_Comm const & comm) |
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: buffer_(b), |
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comm(comm) |
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{ |
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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 save_binary(void const *address, std::size_t count) |
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{ |
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save_impl(address,MPI_BYTE,count); |
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} |
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// fast saving of arrays |
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template<class T> |
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void save_array(serialization::array<T> const& x, unsigned int /* file_version */) |
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{ |
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if (x.count()) |
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save_impl(x.address(), get_mpi_datatype(*x.address()), x.count()); |
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} |
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typedef is_mpi_datatype<mpl::_1> use_array_optimization; |
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#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS |
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friend class archive::save_access; |
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protected: |
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#else |
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public: |
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#endif |
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// default saving of primitives. |
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template<class T> |
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void save(const T & t) |
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{ |
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save_impl(&t, get_mpi_datatype<T>(t), 1); |
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} |
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template<class CharType> |
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void save(const std::basic_string<CharType> &s) |
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{ |
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unsigned int l = static_cast<unsigned int>(s.size()); |
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save(l); |
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save_impl(s.data(),get_mpi_datatype(CharType()),s.size()); |
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} |
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private: |
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void save_impl(void const * p, MPI_Datatype t, int l) |
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{ |
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// allocate enough memory |
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int memory_needed; |
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BOOST_MPI_CHECK_RESULT(MPI_Pack_size,(l,t,comm,&memory_needed)); |
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int position = buffer_.size(); |
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buffer_.resize(position + memory_needed); |
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// pack the data into the buffer |
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BOOST_MPI_CHECK_RESULT(MPI_Pack, |
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(const_cast<void*>(p), l, t, boost::serialization::detail::get_data(buffer_), buffer_.size(), &position, comm)); |
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// reduce the buffer size if needed |
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BOOST_ASSERT(std::size_t(position) <= buffer_.size()); |
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if (std::size_t(position) < buffer_.size()) |
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buffer_.resize(position); |
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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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}; |
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} } // end namespace boost::mpi |
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#endif // BOOST_MPI_PACKED_OPRIMITIVE_HPP
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