ceph/src/boost/libs/mpi/include/boost/mpi/detail/binary_buffer_oprimitive.hpp

   1 // (C) Copyright 2005-2007 Matthias Troyer
   2
   3 // Use, modification and distribution is subject to the Boost Software
   4 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   5 // http://www.boost.org/LICENSE_1_0.txt)
   6
   7 //  Authors: Matthias Troyer
   8
   9 #ifndef BOOST_MPI_BINARY_BUFFER_OPRIMITIVE_HPP
  10 #define BOOST_MPI_BINARY_BUFFER_OPRIMITIVE_HPP
  11
  12 #include <mpi.h>
  13 #include <iostream>
  14 #include <cstddef> // size_t
  15 #include <boost/config.hpp>
  16
  17 #include <boost/serialization/array.hpp>
  18 #include <boost/serialization/is_bitwise_serializable.hpp>
  19 #include <boost/assert.hpp>
  20 #include <boost/mpl/assert.hpp>
  21 #include <vector>
  22 #include <boost/mpi/allocator.hpp>
  23 #include <boost/mpl/always.hpp>
  24 #include <boost/type_traits/remove_const.hpp>
  25
  26 namespace boost { namespace mpi {
  27
  28 /// serialization using binary copy into a buffer
  29
  30 class BOOST_MPI_DECL binary_buffer_oprimitive
  31 {
  32 public:
  33     /// the type of the buffer into which the data is packed upon serialization
  34     typedef std::vector<char, allocator<char> > buffer_type;
  35
  36     binary_buffer_oprimitive(buffer_type & b, MPI_Comm const &)
  37      : buffer_(b)
  38     {
  39     }
  40
  41     void const * address() const
  42     {
  43       return &buffer_.front();
  44     }
  45
  46     const std::size_t& size() const
  47     {
  48       return size_ = buffer_.size();
  49     }
  50
  51     void save_binary(void const *address, std::size_t count)
  52     {
  53       save_impl(address,count);
  54     }
  55
  56     // fast saving of arrays
  57     template<class T>
  58     void save_array(serialization::array_wrapper<T> const& x, unsigned int /* file_version */)
  59     {
  60
  61       BOOST_MPL_ASSERT((serialization::is_bitwise_serializable<BOOST_DEDUCED_TYPENAME remove_const<T>::type>));
  62       if (x.count())
  63         save_impl(x.address(), x.count()*sizeof(T));
  64     }
  65
  66     template<class T>
  67     void save(serialization::array_wrapper<T> const& x)
  68     {
  69       save_array(x,0u);
  70     }
  71
  72     typedef serialization::is_bitwise_serializable<mpl::_1> use_array_optimization;
  73
  74     // default saving of primitives.
  75     template<class T>
  76     void save(const T & t)
  77     {
  78       BOOST_MPL_ASSERT((serialization::is_bitwise_serializable<BOOST_DEDUCED_TYPENAME remove_const<T>::type>));
  79       save_impl(&t, sizeof(T));
  80     }
  81
  82     template<class CharType>
  83     void save(const std::basic_string<CharType> &s)
  84     {
  85       unsigned int l = static_cast<unsigned int>(s.size());
  86       save(l);
  87       save_impl(s.data(),s.size());
  88     }
  89
  90 private:
  91
  92     void save_impl(void const * p, int l)
  93     {
  94       char const* ptr = reinterpret_cast<char const*>(p);
  95       buffer_.insert(buffer_.end(),ptr,ptr+l);
  96     }
  97
  98   buffer_type& buffer_;
  99   mutable std::size_t size_;
 100 };
 101
 102 } } // end namespace boost::mpi
 103
 104 #endif // BOOST_MPI_BINARY_BUFFER_OPRIMITIVE_HPP