ceph/src/boost/boost/mpi/detail/binary_buffer_iprimitive.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_IPRIMITIVE_HPP
  10 #define BOOST_MPI_BINARY_BUFFER_IPRIMITIVE_HPP
  11
  12 #include <mpi.h>
  13 #include <iostream>
  14 #include <cstddef> // size_t
  15 #include <boost/config.hpp>
  16 #include <boost/mpi/exception.hpp>
  17 #include <boost/assert.hpp>
  18 #include <boost/mpl/assert.hpp>
  19 #include <boost/serialization/array.hpp>
  20 #include <boost/serialization/is_bitwise_serializable.hpp>
  21 #include <vector>
  22 #include <boost/mpi/allocator.hpp>
  23 #include <cstring> // for memcpy
  24 #include <cassert>
  25
  26 namespace boost { namespace mpi {
  27
  28 /// deserialization using MPI_Unpack
  29
  30 class BOOST_MPI_DECL binary_buffer_iprimitive
  31 {
  32 public:
  33     /// the type of the buffer from which the data is unpacked upon deserialization
  34     typedef std::vector<char, allocator<char> > buffer_type;
  35
  36     binary_buffer_iprimitive(buffer_type & b, MPI_Comm const &, int position = 0)
  37      : buffer_(b),
  38        position(position)
  39     {
  40     }
  41
  42     void* address ()
  43     {
  44       return &buffer_.front();
  45     }
  46
  47     void const* address () const
  48     {
  49       return &buffer_.front();
  50     }
  51
  52     const std::size_t& size() const
  53     {
  54       return size_ = buffer_.size();
  55     }
  56
  57     void resize(std::size_t s)
  58     {
  59       buffer_.resize(s);
  60     }
  61
  62     void load_binary(void *address, std::size_t count)
  63     {
  64       load_impl(address,count);
  65     }
  66
  67     // fast saving of arrays of fundamental types
  68     template<class T>
  69     void load_array(serialization::array_wrapper<T> const& x, unsigned int /* file_version */)
  70     {
  71       BOOST_MPL_ASSERT((serialization::is_bitwise_serializable<BOOST_DEDUCED_TYPENAME remove_const<T>::type>));
  72       if (x.count())
  73         load_impl(x.address(), sizeof(T)*x.count());
  74     }
  75
  76     typedef serialization::is_bitwise_serializable<mpl::_1> use_array_optimization;
  77
  78     template<class T>
  79     void load(serialization::array_wrapper<T> const& x)
  80     {
  81       load_array(x,0u);
  82     }
  83
  84     // default saving of primitives.
  85     template<class T>
  86     void load( T & t)
  87     {
  88       BOOST_MPL_ASSERT((serialization::is_bitwise_serializable<BOOST_DEDUCED_TYPENAME remove_const<T>::type>));
  89       load_impl(&t, sizeof(T));
  90     }
  91
  92     template<class CharType>
  93     void load(std::basic_string<CharType> & s)
  94     {
  95       unsigned int l;
  96       load(l);
  97       // borland de-allocator fixup
  98       #if BOOST_WORKAROUND(_RWSTD_VER, BOOST_TESTED_AT(20101))
  99       if(NULL != s.data())
 100       #endif
 101       s.resize(l);
 102       // note breaking a rule here - could be a problem on some platform
 103       load_impl(const_cast<char *>(s.data()),l);
 104     }
 105
 106 private:
 107
 108     void load_impl(void * p, int l)
 109     {
 110       assert(position+l<=static_cast<int>(buffer_.size()));
 111       if (l)
 112         std::memcpy(p,&buffer_[position],l);
 113       position += l;
 114     }
 115
 116     buffer_type & buffer_;
 117     mutable std::size_t size_;
 118     int position;
 119 };
 120
 121 } } // end namespace boost::mpi
 122
 123 #endif // BOOST_MPI_PACKED_IPRIMITIVE_HPP