97 lines
2.8 KiB
C++
97 lines
2.8 KiB
C++
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// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
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// Copyright (c) 2008-2012 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
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// This file was modified by Oracle on 2020.
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// Modifications copyright (c) 2020, Oracle and/or its affiliates.
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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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 constexpr 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 constexpr 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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\tparam Point1 \tparam_point
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\tparam Point2 \tparam_point
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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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\qbk{[heading Examples]}
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\qbk{[dot_product] [dot_product_output]}
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*/
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template <typename Point1, typename Point2>
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// workaround for VS2015
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#if !defined(_MSC_VER) || (_MSC_VER >= 1910)
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constexpr
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#endif
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inline typename select_coordinate_type<Point1, Point2>::type dot_product(
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Point1 const& p1, Point2 const& p2)
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{
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BOOST_CONCEPT_ASSERT( (concepts::ConstPoint<Point1>) );
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BOOST_CONCEPT_ASSERT( (concepts::ConstPoint<Point2>) );
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return detail::dot_product_maker
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<
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Point1, Point2,
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0, dimension<Point1>::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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