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