| // (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_OPRIMITIVE_HPP |
| #define BOOST_MPI_PACKED_OPRIMITIVE_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/serialization/detail/get_data.hpp> |
| #include <boost/serialization/array.hpp> |
| #include <boost/assert.hpp> |
| #include <vector> |
| #include <boost/mpi/allocator.hpp> |
| |
| namespace boost { namespace mpi { |
| |
| /// serialization using MPI::Pack |
| |
| class BOOST_MPI_DECL packed_oprimitive |
| { |
| public: |
| /// the type of the buffer into which the data is packed upon serialization |
| typedef std::vector<char, allocator<char> > buffer_type; |
| |
| packed_oprimitive(buffer_type & b, MPI_Comm const & comm) |
| : buffer_(b), |
| comm(comm) |
| { |
| } |
| |
| void const * address() const |
| { |
| return &buffer_[0]; |
| } |
| |
| const std::size_t& size() const |
| { |
| return size_ = buffer_.size(); |
| } |
| |
| void save_binary(void const *address, std::size_t count) |
| { |
| save_impl(address,MPI_BYTE,count); |
| } |
| |
| // fast saving of arrays |
| template<class T> |
| void save_array(serialization::array<T> const& x, unsigned int /* file_version */) |
| { |
| if (x.count()) |
| save_impl(x.address(), get_mpi_datatype(*x.address()), x.count()); |
| } |
| |
| typedef is_mpi_datatype<mpl::_1> use_array_optimization; |
| |
| #ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS |
| friend class archive::save_access; |
| protected: |
| #else |
| public: |
| #endif |
| |
| // default saving of primitives. |
| template<class T> |
| void save(const T & t) |
| { |
| save_impl(&t, get_mpi_datatype<T>(t), 1); |
| } |
| |
| template<class CharType> |
| void save(const std::basic_string<CharType> &s) |
| { |
| unsigned int l = static_cast<unsigned int>(s.size()); |
| save(l); |
| save_impl(s.data(),get_mpi_datatype(CharType()),s.size()); |
| } |
| |
| private: |
| |
| void save_impl(void const * p, MPI_Datatype t, int l) |
| { |
| // allocate enough memory |
| int memory_needed; |
| BOOST_MPI_CHECK_RESULT(MPI_Pack_size,(l,t,comm,&memory_needed)); |
| |
| int position = buffer_.size(); |
| buffer_.resize(position + memory_needed); |
| |
| // pack the data into the buffer |
| BOOST_MPI_CHECK_RESULT(MPI_Pack, |
| (const_cast<void*>(p), l, t, boost::serialization::detail::get_data(buffer_), buffer_.size(), &position, comm)); |
| // reduce the buffer size if needed |
| BOOST_ASSERT(std::size_t(position) <= buffer_.size()); |
| if (std::size_t(position) < buffer_.size()) |
| buffer_.resize(position); |
| } |
| |
| buffer_type& buffer_; |
| mutable std::size_t size_; |
| MPI_Comm comm; |
| }; |
| |
| } } // end namespace boost::mpi |
| |
| #endif // BOOST_MPI_PACKED_OPRIMITIVE_HPP |