ceph/src/boost/boost/geometry/core/reverse_dispatch.hpp

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2
   3 // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
   4 // Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
   5 // Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
   6
   7 // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
   8 // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
   9
  10 // Use, modification and distribution is subject to the Boost Software License,
  11 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  12 // http://www.boost.org/LICENSE_1_0.txt)
  13
  14
  15 #ifndef BOOST_GEOMETRY_CORE_REVERSE_DISPATCH_HPP
  16 #define BOOST_GEOMETRY_CORE_REVERSE_DISPATCH_HPP
  17
  18
  19 #include <cstddef>
  20
  21 #include <boost/mpl/if.hpp>
  22 #include <boost/type_traits/integral_constant.hpp>
  23
  24 #include <boost/geometry/core/geometry_id.hpp>
  25
  26
  27 namespace boost { namespace geometry
  28 {
  29
  30
  31 #ifndef DOXYGEN_NO_DETAIL
  32 namespace detail
  33 {
  34
  35 // Different geometries: reverse_dispatch if second ID < first ID
  36 template <std::size_t GeometryId1, std::size_t GeometryId2>
  37 struct reverse_dispatch : boost::mpl::if_c
  38     <
  39         (GeometryId1 > GeometryId2),
  40         boost::true_type,
  41         boost::false_type
  42     >
  43 {};
  44
  45
  46 // Same geometry: never reverse_dispatch
  47 template <std::size_t GeometryId>
  48 struct reverse_dispatch<GeometryId, GeometryId> : boost::false_type {};
  49
  50
  51 } // namespace detail
  52 #endif // DOXYGEN_NO_DETAIL
  53
  54
  55 template <typename Geometry1, typename Geometry2>
  56 struct reverse_dispatch : detail::reverse_dispatch
  57     <
  58         geometry_id<Geometry1>::type::value,
  59         geometry_id<Geometry2>::type::value
  60     >
  61 {};
  62
  63
  64 }} // namespace boost::geometry
  65
  66 #endif // BOOST_GEOMETRY_CORE_REVERSE_DISPATCH_HPP