| // Boost.Geometry (aka GGL, Generic Geometry Library) |
| |
| // Copyright (c) 2007-2011 Barend Gehrels, Amsterdam, the Netherlands. |
| // Copyright (c) 2008-2011 Bruno Lalande, Paris, France. |
| // Copyright (c) 2009-2011 Mateusz Loskot, London, UK. |
| |
| // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library |
| // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands. |
| |
| // Use, modification and distribution is subject to the Boost Software License, |
| // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
| // http://www.boost.org/LICENSE_1_0.txt) |
| |
| #ifndef BOOST_GEOMETRY_STRATEGIES_CONCEPTS_AREA_CONCEPT_HPP |
| #define BOOST_GEOMETRY_STRATEGIES_CONCEPTS_AREA_CONCEPT_HPP |
| |
| |
| #include <boost/concept_check.hpp> |
| |
| |
| namespace boost { namespace geometry { namespace concept |
| { |
| |
| |
| /*! |
| \brief Checks strategy for area |
| \ingroup area |
| */ |
| template <typename Strategy> |
| class AreaStrategy |
| { |
| #ifndef DOXYGEN_NO_CONCEPT_MEMBERS |
| |
| // 1) must define state_type, |
| typedef typename Strategy::state_type state_type; |
| |
| // 2) must define return_type, |
| typedef typename Strategy::return_type return_type; |
| |
| // 3) must define point_type, of polygon (segments) |
| typedef typename Strategy::segment_point_type spoint_type; |
| |
| struct check_methods |
| { |
| static void apply() |
| { |
| Strategy const* str; |
| state_type *st; |
| |
| // 4) must implement a method apply with the following signature |
| spoint_type const* sp; |
| str->apply(*sp, *sp, *st); |
| |
| // 5) must implement a static method result with the following signature |
| return_type r = str->result(*st); |
| |
| boost::ignore_unused_variable_warning(r); |
| boost::ignore_unused_variable_warning(str); |
| } |
| }; |
| |
| public : |
| BOOST_CONCEPT_USAGE(AreaStrategy) |
| { |
| check_methods::apply(); |
| } |
| |
| #endif |
| }; |
| |
| |
| }}} // namespace boost::geometry::concept |
| |
| |
| #endif // BOOST_GEOMETRY_STRATEGIES_CONCEPTS_AREA_CONCEPT_HPP |