100 lines
2.6 KiB
Plaintext
100 lines
2.6 KiB
Plaintext
// (C) Copyright 2005 Matthias Troyer
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// Use, modification and distribution is subject to the Boost Software
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// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// Authors: Matthias Troyer
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#ifndef BOOST_MPI_DETAIL_TYPE_MPI_DATATYPE_CACHE_HPP
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#define BOOST_MPI_DETAIL_TYPE_MPI_DATATYPE_CACHE_HPP
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#include <boost/mpi/datatype_fwd.hpp>
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#include <boost/mpi/detail/mpi_datatype_oarchive.hpp>
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#include <boost/mpi/exception.hpp>
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#include <boost/utility/enable_if.hpp>
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#include <boost/mpl/assert.hpp>
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#include <boost/noncopyable.hpp>
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#include <typeinfo>
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// The std::type_info::before function in Visual C++ 8.0 (and probably earlier)
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// incorrectly returns an "int" instead of a "bool". Then the compiler has the
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// audacity to complain when that "int" is converted to a "bool". Silence
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// this warning.
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#ifdef BOOST_MSVC
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# pragma warning(push)
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# pragma warning(disable : 4800)
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#endif
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namespace boost { namespace mpi { namespace detail {
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/// @brief comparison function object for two std::type_info pointers
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///
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/// is implemented using the before() member function of the std::type_info
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/// class
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struct type_info_compare
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{
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bool operator()(std::type_info const* lhs, std::type_info const* rhs) const
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{
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return lhs->before(*rhs);
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}
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};
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/// @brief a map of MPI data types, indexed by their type_info
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///
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///
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class BOOST_MPI_DECL mpi_datatype_map
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: public boost::noncopyable
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{
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struct implementation;
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implementation *impl;
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public:
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mpi_datatype_map();
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~mpi_datatype_map();
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template <class T>
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MPI_Datatype datatype(const T& x = T(), typename boost::enable_if<is_mpi_builtin_datatype<T> >::type* =0)
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{
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return get_mpi_datatype<T>(x);
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}
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template <class T>
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MPI_Datatype datatype(const T& x =T(), typename boost::disable_if<is_mpi_builtin_datatype<T> >::type* =0 )
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{
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BOOST_MPL_ASSERT((is_mpi_datatype<T>));
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// check whether the type already exists
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std::type_info const* t = &typeid(T);
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MPI_Datatype datatype = get(t);
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if (datatype == MPI_DATATYPE_NULL) {
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// need to create a type
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mpi_datatype_oarchive ar(x);
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datatype = ar.get_mpi_datatype();
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set(t, datatype);
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}
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return datatype;
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}
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void clear();
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private:
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MPI_Datatype get(const std::type_info* t);
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void set(const std::type_info* t, MPI_Datatype datatype);
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};
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/// Retrieve the MPI datatype cache
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BOOST_MPI_DECL mpi_datatype_map& mpi_datatype_cache();
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} } } // end namespace boost::mpi::detail
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#ifdef BOOST_MSVC
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# pragma warning(pop)
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#endif
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#endif // BOOST_MPI_DETAIL_TYPE_MPI_DATATYPE_CACHE_HPP
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