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1 | // (C) Copyright 2005 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_DETAIL_TYPE_MPI_DATATYPE_CACHE_HPP | |
10 | #define BOOST_MPI_DETAIL_TYPE_MPI_DATATYPE_CACHE_HPP | |
11 | ||
12 | #include <boost/mpi/datatype_fwd.hpp> | |
13 | #include <boost/mpi/detail/mpi_datatype_oarchive.hpp> | |
14 | #include <boost/mpi/exception.hpp> | |
15 | #include <boost/utility/enable_if.hpp> | |
16 | #include <boost/mpl/assert.hpp> | |
17 | #include <boost/noncopyable.hpp> | |
18 | #include <typeinfo> | |
19 | ||
20 | // The std::type_info::before function in Visual C++ 8.0 (and probably earlier) | |
21 | // incorrectly returns an "int" instead of a "bool". Then the compiler has the | |
22 | // audacity to complain when that "int" is converted to a "bool". Silence | |
23 | // this warning. | |
24 | #ifdef BOOST_MSVC | |
25 | # pragma warning(push) | |
26 | # pragma warning(disable : 4800) | |
27 | #endif | |
28 | ||
29 | namespace boost { namespace mpi { namespace detail { | |
30 | ||
31 | /// @brief comparison function object for two std::type_info pointers | |
32 | /// | |
33 | /// is implemented using the before() member function of the std::type_info | |
34 | /// class | |
35 | ||
36 | struct type_info_compare | |
37 | { | |
38 | bool operator()(std::type_info const* lhs, std::type_info const* rhs) const | |
39 | { | |
40 | return lhs->before(*rhs); | |
41 | } | |
42 | }; | |
43 | ||
44 | ||
45 | /// @brief a map of MPI data types, indexed by their type_info | |
46 | /// | |
47 | /// | |
48 | class BOOST_MPI_DECL mpi_datatype_map | |
49 | : public boost::noncopyable | |
50 | { | |
51 | struct implementation; | |
52 | ||
53 | implementation *impl; | |
54 | ||
55 | public: | |
56 | mpi_datatype_map(); | |
57 | ~mpi_datatype_map(); | |
58 | ||
59 | template <class T> | |
60 | MPI_Datatype datatype(const T& x = T(), typename boost::enable_if<is_mpi_builtin_datatype<T> >::type* =0) | |
61 | { | |
62 | return get_mpi_datatype<T>(x); | |
63 | } | |
64 | ||
65 | template <class T> | |
66 | MPI_Datatype datatype(const T& x =T(), typename boost::disable_if<is_mpi_builtin_datatype<T> >::type* =0 ) | |
67 | { | |
68 | BOOST_MPL_ASSERT((is_mpi_datatype<T>)); | |
69 | ||
70 | // check whether the type already exists | |
71 | std::type_info const* t = &typeid(T); | |
72 | MPI_Datatype datatype = get(t); | |
73 | if (datatype == MPI_DATATYPE_NULL) { | |
74 | // need to create a type | |
75 | mpi_datatype_oarchive ar(x); | |
76 | datatype = ar.get_mpi_datatype(); | |
77 | set(t, datatype); | |
78 | } | |
79 | ||
80 | return datatype; | |
81 | } | |
82 | ||
83 | void clear(); | |
84 | ||
85 | private: | |
86 | MPI_Datatype get(const std::type_info* t); | |
87 | void set(const std::type_info* t, MPI_Datatype datatype); | |
88 | }; | |
89 | ||
90 | /// Retrieve the MPI datatype cache | |
91 | BOOST_MPI_DECL mpi_datatype_map& mpi_datatype_cache(); | |
92 | ||
93 | } } } // end namespace boost::mpi::detail | |
94 | ||
95 | #ifdef BOOST_MSVC | |
96 | # pragma warning(pop) | |
97 | #endif | |
98 | ||
99 | #endif // BOOST_MPI_DETAIL_TYPE_MPI_DATATYPE_CACHE_HPP |