mirror of https://github.com/CGAL/cgal
124 lines
2.9 KiB
C++
124 lines
2.9 KiB
C++
// Copyright (c) 2005 INRIA Sophia-Antipolis (France).
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// All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org); you may redistribute it under
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// the terms of the Q Public License version 1.0.
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// See the file LICENSE.QPL distributed with CGAL.
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//
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// Licensees holding a valid commercial license may use this file in
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// accordance with the commercial license agreement provided with the software.
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//
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// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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//
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// $URL$
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// $Id$
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//
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//
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// Author(s) : Laurent RINEAU
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#ifndef CGAL_POINT_TRAITS_H
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#define CGAL_POINT_TRAITS_H
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#include <CGAL/Weighted_point.h>
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#include <boost/config.hpp>
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#include <boost/mpl/bool.hpp>
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#include <CGAL/assertions.h>
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namespace CGAL {
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template <class P>
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struct Is_weighted : public ::boost::mpl::false_ {} ;
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template <class P, typename FT>
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struct Is_weighted< ::CGAL::Weighted_point<P, FT> > :
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public ::boost::mpl::true_ {} ;
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namespace details {
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template <class P, typename FT, bool>
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struct Point_traits_aux
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{
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// should give errors
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};
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template <class P, typename FT>
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struct Point_traits_aux<P, FT, false>
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{
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typedef P Point;
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typedef P Bare_point;
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typedef typename ::CGAL::Weighted_point<Bare_point, FT> Weighted_point;
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typedef Tag_false Is_weighted;
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const Bare_point& bare_point(const Point& bp)
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{
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return bp;
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}
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Weighted_point weighted_point(const Point& bp)
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{
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return Weighted_point(bp);
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}
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const Point& point(const Bare_point& bp)
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{
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return bp;
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}
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const Point& point(const Weighted_point& wp)
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{
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return wp.point();
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}
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}; // end class Point_traits_aux<P>
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template <class P, typename FT>
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struct Point_traits_aux<P, FT, true>
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{
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typedef P Point;
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typedef P Weighted_point;
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typedef typename Point::Point Bare_point;
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typedef Tag_true Is_weighted;
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const Bare_point& bare_point(const Point& wp)
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{
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return wp.point();
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}
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const Weighted_point& weighted_point(const Point& wp)
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{
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return wp;
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}
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Point point(const Bare_point& bp)
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{
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return Weighted_point(bp);
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}
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const Point& point(const Weighted_point& wp)
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{
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return wp;
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}
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}; // end class Point_traits_aux<P, FT, true>
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template <class Point>
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struct FT_of_point
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{
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typedef typename CGAL::Kernel_traits<Point>::Kernel::FT type;
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};
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} // end namespace details
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template <class Point>
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class Point_traits
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: public details::Point_traits_aux<
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Point,
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typename details::FT_of_point<Point>::type,
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Is_weighted<Point>::value
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>
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{
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}; // end class Point_traits<T>
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} // end namespace CGAL
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#endif // CGAL_POINT_TRAITS_H
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