79 lines
2.2 KiB
C++
79 lines
2.2 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
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// Copyright (c) 2008-2012 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
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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_ARITHMETIC_DETERMINANT_HPP
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#define BOOST_GEOMETRY_ARITHMETIC_DETERMINANT_HPP
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#include <cstddef>
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#include <boost/geometry/core/access.hpp>
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#include <boost/geometry/geometries/concepts/point_concept.hpp>
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#include <boost/geometry/util/select_coordinate_type.hpp>
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#include <boost/numeric/conversion/cast.hpp>
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namespace boost { namespace geometry
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{
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#ifndef DOXYGEN_NO_DETAIL
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namespace detail
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{
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template <typename ReturnType, typename U, typename V>
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class calculate_determinant
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{
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template <typename T>
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static inline ReturnType rt(T const& v)
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{
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return boost::numeric_cast<ReturnType>(v);
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}
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public :
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static inline ReturnType apply(U const& ux, U const& uy
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, V const& vx, V const& vy)
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{
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return rt(ux) * rt(vy) - rt(uy) * rt(vx);
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}
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};
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template <typename ReturnType, typename U, typename V>
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inline ReturnType determinant(U const& ux, U const& uy
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, V const& vx, V const& vy)
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{
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return calculate_determinant
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<
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ReturnType, U, V
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>::apply(ux, uy, vx, vy);
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}
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template <typename ReturnType, typename U, typename V>
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inline ReturnType determinant(U const& u, V const& v)
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{
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BOOST_CONCEPT_ASSERT( (concepts::ConstPoint<U>) );
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BOOST_CONCEPT_ASSERT( (concepts::ConstPoint<V>) );
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return calculate_determinant
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<
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ReturnType,
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typename geometry::coordinate_type<U>::type,
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typename geometry::coordinate_type<V>::type
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>::apply(get<0>(u), get<1>(u), get<0>(v), get<1>(v));
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}
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} // namespace detail
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#endif // DOXYGEN_NO_DETAIL
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_ARITHMETIC_DETERMINANT_HPP
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