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51 lines
1.6 KiB
51 lines
1.6 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_DEFAULT_AREA_RESULT_HPP |
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#define BOOST_GEOMETRY_STRATEGIES_DEFAULT_AREA_RESULT_HPP |
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#include <boost/geometry/core/cs.hpp> |
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#include <boost/geometry/core/coordinate_type.hpp> |
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#include <boost/geometry/strategies/area.hpp> |
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#include <boost/geometry/util/select_most_precise.hpp> |
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namespace boost { namespace geometry |
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{ |
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/*! |
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\brief Meta-function defining return type of area function, using the default strategy |
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\ingroup area |
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\note The strategy defines the return-type (so this situation is different |
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from length, where distance is sqr/sqrt, but length always squared) |
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*/ |
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template <typename Geometry> |
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struct default_area_result |
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{ |
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typedef typename point_type<Geometry>::type point_type; |
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typedef typename strategy::area::services::default_strategy |
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< |
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typename cs_tag<point_type>::type, |
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point_type |
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>::type strategy_type; |
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typedef typename strategy_type::return_type type; |
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}; |
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}} // namespace boost::geometry |
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#endif // BOOST_GEOMETRY_STRATEGIES_DEFAULT_AREA_RESULT_HPP
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