mpi/detail/binary_buffer_oprimitive.hpp

0001 // (C) Copyright 2005-2007 Matthias Troyer
0002
0003 // Use, modification and distribution is subject to the Boost Software
0004 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
0005 // http://www.boost.org/LICENSE_1_0.txt)
0006
0007 //  Authors: Matthias Troyer
0008
0009 #ifndef BOOST_MPI_BINARY_BUFFER_OPRIMITIVE_HPP
0010 #define BOOST_MPI_BINARY_BUFFER_OPRIMITIVE_HPP
0011
0012 #include <mpi.h>
0013 #include <iostream>
0014 #include <cstddef> // size_t
0015 #include <boost/config.hpp>
0016
0017 #include <boost/serialization/array.hpp>
0018 #include <boost/serialization/is_bitwise_serializable.hpp>
0019 #include <boost/assert.hpp>
0020 #include <boost/mpl/assert.hpp>
0021 #include <vector>
0022 #include <boost/mpi/allocator.hpp>
0023 #include <boost/mpl/always.hpp>
0024 #include <boost/type_traits/remove_const.hpp>
0025
0026 namespace boost { namespace mpi {
0027
0028 /// serialization using binary copy into a buffer
0029
0030 class BOOST_MPI_DECL binary_buffer_oprimitive
0031 {
0032 public:
0033     /// the type of the buffer into which the data is packed upon serialization
0034     typedef std::vector<char, allocator<char> > buffer_type;
0035
0036     binary_buffer_oprimitive(buffer_type & b, MPI_Comm const &)
0037      : buffer_(b)
0038     {
0039     }
0040
0041     void const * address() const
0042     {
0043       return detail::c_data(buffer_);
0044     }
0045
0046     const std::size_t& size() const
0047     {
0048       return size_ = buffer_.size();
0049     }
0050
0051     const std::size_t* size_ptr() const
0052     {
0053       return &size();
0054     }
0055
0056     void save_binary(void const *address, std::size_t count)
0057     {
0058       save_impl(address,count);
0059     }
0060
0061     // fast saving of arrays
0062     template<class T>
0063     void save_array(serialization::array_wrapper<T> const& x, unsigned int /* file_version */)
0064     {
0065
0066       BOOST_MPL_ASSERT((serialization::is_bitwise_serializable<BOOST_DEDUCED_TYPENAME remove_const<T>::type>));
0067       if (x.count())
0068         save_impl(x.address(), x.count()*sizeof(T));
0069     }
0070
0071     template<class T>
0072     void save(serialization::array_wrapper<T> const& x)
0073     {
0074       save_array(x,0u);
0075     }
0076
0077     typedef serialization::is_bitwise_serializable<mpl::_1> use_array_optimization;
0078
0079     // default saving of primitives.
0080     template<class T>
0081     void save(const T & t)
0082     {
0083       BOOST_MPL_ASSERT((serialization::is_bitwise_serializable<BOOST_DEDUCED_TYPENAME remove_const<T>::type>));
0084       save_impl(&t, sizeof(T));
0085     }
0086
0087     template<class CharType>
0088     void save(const std::basic_string<CharType> &s)
0089     {
0090       unsigned int l = static_cast<unsigned int>(s.size());
0091       save(l);
0092       save_impl(s.data(),s.size()*sizeof(CharType));
0093     }
0094
0095 private:
0096
0097     void save_impl(void const * p, int l)
0098     {
0099       char const* ptr = reinterpret_cast<char const*>(p);
0100       buffer_.insert(buffer_.end(),ptr,ptr+l);
0101     }
0102
0103   buffer_type& buffer_;
0104   mutable std::size_t size_;
0105 };
0106
0107 } } // end namespace boost::mpi
0108
0109 #endif // BOOST_MPI_BINARY_BUFFER_OPRIMITIVE_HPP