Chris@16: // Boost.Geometry (aka GGL, Generic Geometry Library)
Chris@16: 
Chris@16: // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
Chris@16: // Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
Chris@16: // Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
Chris@16: 
Chris@16: // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
Chris@16: // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
Chris@16: 
Chris@16: // Use, modification and distribution is subject to the Boost Software License,
Chris@16: // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef BOOST_GEOMETRY_STRATEGIES_CONCEPTS_AREA_CONCEPT_HPP
Chris@16: #define BOOST_GEOMETRY_STRATEGIES_CONCEPTS_AREA_CONCEPT_HPP
Chris@16: 
Chris@16: 
Chris@16: #include <boost/concept_check.hpp>
Chris@16: 
Chris@16: 
Chris@16: namespace boost { namespace geometry { namespace concept
Chris@16: {
Chris@16: 
Chris@16: 
Chris@16: /*!
Chris@16:     \brief Checks strategy for area
Chris@16:     \ingroup area
Chris@16: */
Chris@16: template <typename Strategy>
Chris@16: class AreaStrategy
Chris@16: {
Chris@16: #ifndef DOXYGEN_NO_CONCEPT_MEMBERS
Chris@16: 
Chris@16:     // 1) must define state_type,
Chris@16:     typedef typename Strategy::state_type state_type;
Chris@16: 
Chris@16:     // 2) must define return_type,
Chris@16:     typedef typename Strategy::return_type return_type;
Chris@16: 
Chris@16:     // 3) must define point_type, of polygon (segments)
Chris@16:     typedef typename Strategy::segment_point_type spoint_type;
Chris@16: 
Chris@16:     struct check_methods
Chris@16:     {
Chris@16:         static void apply()
Chris@16:         {
Chris@16:             Strategy const* str = 0;
Chris@16:             state_type *st = 0;
Chris@16: 
Chris@16:             // 4) must implement a method apply with the following signature
Chris@16:             spoint_type const* sp = 0;
Chris@16:             str->apply(*sp, *sp, *st);
Chris@16: 
Chris@16:             // 5) must implement a static method result with the following signature
Chris@16:             return_type r = str->result(*st);
Chris@16: 
Chris@16:             boost::ignore_unused_variable_warning(r);
Chris@16:             boost::ignore_unused_variable_warning(str);
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16: public :
Chris@16:     BOOST_CONCEPT_USAGE(AreaStrategy)
Chris@16:     {
Chris@16:         check_methods::apply();
Chris@16:     }
Chris@16: 
Chris@16: #endif
Chris@16: };
Chris@16: 
Chris@16: 
Chris@16: }}} // namespace boost::geometry::concept
Chris@16: 
Chris@16: 
Chris@16: #endif // BOOST_GEOMETRY_STRATEGIES_CONCEPTS_AREA_CONCEPT_HPP