ceph/src/boost/boost/geometry/strategies/concepts/area_concept.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 // Copyright (c) 2017 Adam Wulkiewicz, Lodz, Poland.
   7
   8 // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
   9 // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
  10
  11 // Use, modification and distribution is subject to the Boost Software License,
  12 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  13 // http://www.boost.org/LICENSE_1_0.txt)
  14
  15 #ifndef BOOST_GEOMETRY_STRATEGIES_CONCEPTS_AREA_CONCEPT_HPP
  16 #define BOOST_GEOMETRY_STRATEGIES_CONCEPTS_AREA_CONCEPT_HPP
  17
  18
  19 #include <boost/concept_check.hpp>
  20
  21
  22 namespace boost { namespace geometry { namespace concepts
  23 {
  24
  25
  26 /*!
  27     \brief Checks strategy for area
  28     \ingroup area
  29 */
  30 template <typename Geometry, typename Strategy>
  31 class AreaStrategy
  32 {
  33 #ifndef DOXYGEN_NO_CONCEPT_MEMBERS
  34
  35     // 1) must define state template,
  36     typedef typename Strategy::template state<Geometry> state_type;
  37
  38     // 2) must define result_type template,
  39     typedef typename Strategy::template result_type<Geometry>::type return_type;
  40
  41     struct check_methods
  42     {
  43         static void apply()
  44         {
  45             Strategy const* str = 0;
  46             state_type *st = 0;
  47
  48             // 3) must implement a method apply with the following signature
  49             typename geometry::point_type<Geometry>::type const* sp = 0;
  50             str->apply(*sp, *sp, *st);
  51
  52             // 4) must implement a static method result with the following signature
  53             return_type r = str->result(*st);
  54
  55             boost::ignore_unused_variable_warning(r);
  56             boost::ignore_unused_variable_warning(str);
  57         }
  58     };
  59
  60 public :
  61     BOOST_CONCEPT_USAGE(AreaStrategy)
  62     {
  63         check_methods::apply();
  64     }
  65
  66 #endif
  67 };
  68
  69
  70 }}} // namespace boost::geometry::concepts
  71
  72
  73 #endif // BOOST_GEOMETRY_STRATEGIES_CONCEPTS_AREA_CONCEPT_HPP