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// Boost.Geometry (aka GGL, Generic Geometry Library)
// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
// Copyright (c) 2009-2012 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_CENTROID_CONCEPT_HPP
#define BOOST_GEOMETRY_STRATEGIES_CONCEPTS_CENTROID_CONCEPT_HPP
#include <boost/concept_check.hpp>
namespace boost { namespace geometry { namespace concept
{
/*!
\brief Checks strategy for centroid
\ingroup centroid
*/
template <typename Strategy>
class CentroidStrategy
{
#ifndef DOXYGEN_NO_CONCEPT_MEMBERS
// 1) must define state_type,
typedef typename Strategy::state_type state_type;
// 2) must define point_type,
typedef typename Strategy::point_type point_type;
// 3) must define point_type, of polygon (segments)
typedef typename Strategy::segment_point_type spoint_type;
struct check_methods
{
static void apply()
{
Strategy *str = 0;
state_type *st = 0;
// 4) must implement a static method apply,
// getting two segment-points
spoint_type const* sp = 0;
str->apply(*sp, *sp, *st);
// 5) must implement a static method result
// getting the centroid
point_type *c = 0;
bool r = str->result(*st, *c);
boost::ignore_unused_variable_warning(str);
boost::ignore_unused_variable_warning(r);
}
};
public :
BOOST_CONCEPT_USAGE(CentroidStrategy)
{
check_methods::apply();
}
#endif
};
}}} // namespace boost::geometry::concept
#endif // BOOST_GEOMETRY_STRATEGIES_CONCEPTS_CENTROID_CONCEPT_HPP
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