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82 lines
2.4 KiB
82 lines
2.4 KiB
// Boost.Geometry (aka GGL, Generic Geometry Library) |
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// Copyright (c) 2008-2011 Bruno Lalande, Paris, France. |
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// Copyright (c) 2008-2011 Barend Gehrels, Amsterdam, the Netherlands. |
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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_ARITHMETIC_DOT_PRODUCT_HPP |
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#define BOOST_GEOMETRY_ARITHMETIC_DOT_PRODUCT_HPP |
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#include <cstddef> |
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#include <boost/concept/requires.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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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 P1, typename P2, std::size_t Dimension, std::size_t DimensionCount> |
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struct dot_product_maker |
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{ |
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typedef typename select_coordinate_type<P1, P2>::type coordinate_type; |
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static inline coordinate_type apply(P1 const& p1, P2 const& p2) |
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{ |
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return get<Dimension>(p1) * get<Dimension>(p2) |
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+ dot_product_maker<P1, P2, Dimension+1, DimensionCount>::apply(p1, p2); |
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} |
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}; |
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template <typename P1, typename P2, std::size_t DimensionCount> |
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struct dot_product_maker<P1, P2, DimensionCount, DimensionCount> |
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{ |
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typedef typename select_coordinate_type<P1, P2>::type coordinate_type; |
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static inline coordinate_type apply(P1 const& p1, P2 const& p2) |
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{ |
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return get<DimensionCount>(p1) * get<DimensionCount>(p2); |
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} |
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}; |
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} // namespace detail |
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#endif // DOXYGEN_NO_DETAIL |
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/*! |
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\brief Computes the dot product (or scalar product) of 2 vectors (points). |
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\ingroup arithmetic |
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\param p1 first point |
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\param p2 second point |
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\return the dot product |
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*/ |
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template <typename P1, typename P2> |
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inline typename select_coordinate_type<P1, P2>::type dot_product( |
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P1 const& p1, P2 const& p2) |
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{ |
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BOOST_CONCEPT_ASSERT( (concept::ConstPoint<P1>) ); |
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BOOST_CONCEPT_ASSERT( (concept::ConstPoint<P2>) ); |
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return detail::dot_product_maker |
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< |
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P1, P2, |
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0, dimension<P1>::type::value - 1 |
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>::apply(p1, p2); |
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} |
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}} // namespace boost::geometry |
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#endif // BOOST_GEOMETRY_ARITHMETIC_DOT_PRODUCT_HPP
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