// (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_DETAIL_TYPE_MPI_DATATYPE_CACHE_HPP
|
#define BOOST_MPI_DETAIL_TYPE_MPI_DATATYPE_CACHE_HPP
|
|
#include <boost/mpi/datatype_fwd.hpp>
|
#include <boost/mpi/detail/mpi_datatype_oarchive.hpp>
|
#include <boost/mpi/exception.hpp>
|
#include <boost/utility/enable_if.hpp>
|
#include <boost/mpl/assert.hpp>
|
#include <boost/noncopyable.hpp>
|
#include <typeinfo>
|
|
// The std::type_info::before function in Visual C++ 8.0 (and probably earlier)
|
// incorrectly returns an "int" instead of a "bool". Then the compiler has the
|
// audacity to complain when that "int" is converted to a "bool". Silence
|
// this warning.
|
#ifdef BOOST_MSVC
|
# pragma warning(push)
|
# pragma warning(disable : 4800)
|
#endif
|
|
namespace boost { namespace mpi { namespace detail {
|
|
/// @brief comparison function object for two std::type_info pointers
|
///
|
/// is implemented using the before() member function of the std::type_info
|
/// class
|
|
struct type_info_compare
|
{
|
bool operator()(std::type_info const* lhs, std::type_info const* rhs) const
|
{
|
return lhs->before(*rhs);
|
}
|
};
|
|
|
/// @brief a map of MPI data types, indexed by their type_info
|
///
|
///
|
class BOOST_MPI_DECL mpi_datatype_map
|
: public boost::noncopyable
|
{
|
struct implementation;
|
|
implementation *impl;
|
|
public:
|
mpi_datatype_map();
|
~mpi_datatype_map();
|
|
template <class T>
|
MPI_Datatype datatype(const T& x = T(), typename boost::enable_if<is_mpi_builtin_datatype<T> >::type* =0)
|
{
|
return get_mpi_datatype<T>(x);
|
}
|
|
template <class T>
|
MPI_Datatype datatype(const T& x =T(), typename boost::disable_if<is_mpi_builtin_datatype<T> >::type* =0 )
|
{
|
BOOST_MPL_ASSERT((is_mpi_datatype<T>));
|
|
// check whether the type already exists
|
std::type_info const* t = &typeid(T);
|
MPI_Datatype datatype = get(t);
|
if (datatype == MPI_DATATYPE_NULL) {
|
// need to create a type
|
mpi_datatype_oarchive ar(x);
|
datatype = ar.get_mpi_datatype();
|
set(t, datatype);
|
}
|
|
return datatype;
|
}
|
|
void clear();
|
|
private:
|
MPI_Datatype get(const std::type_info* t);
|
void set(const std::type_info* t, MPI_Datatype datatype);
|
};
|
|
/// Retrieve the MPI datatype cache
|
BOOST_MPI_DECL mpi_datatype_map& mpi_datatype_cache();
|
|
} } } // end namespace boost::mpi::detail
|
|
#ifdef BOOST_MSVC
|
# pragma warning(pop)
|
#endif
|
|
#endif // BOOST_MPI_DETAIL_TYPE_MPI_DATATYPE_CACHE_HPP
|
