// (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 |