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116 lines
2.8 KiB
116 lines
2.8 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_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<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<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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load_impl(const_cast<CharType *>(s.data()),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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