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