127 lines
3.3 KiB
C++
Executable File
127 lines
3.3 KiB
C++
Executable File
// Copyright (c) 2008 INRIA Sophia-Antipolis (France).
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// Aviv University (Israel). All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 3 of the License,
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// or (at your option) any later version.
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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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// SPDX-License-Identifier: LGPL-3.0+
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//
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// Author(s) : Sylvain Pion
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#ifndef CGAL_DIMENSION_H
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#define CGAL_DIMENSION_H
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#include <CGAL/config.h>
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#include <CGAL/Kernel_traits.h>
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#include <climits>
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#include <limits>
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#ifdef CGAL_EIGEN3_ENABLED
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#include <Eigen/Core>
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#endif
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namespace CGAL {
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#ifdef CGAL_EIGEN3_ENABLED
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const int UNKNOWN_DIMENSION=Eigen::Dynamic;
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#elif defined CGAL_CXX11
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const int UNKNOWN_DIMENSION=std::numeric_limits<int>::max();
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#else
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const int UNKNOWN_DIMENSION=(unsigned)-1/2;
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#endif
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// Check that dimension d1 is fine for a kernel of dimension d2.
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// If d2 is unknown, any d1 is fine.
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inline bool check_dimension_eq(int d1, int d2){
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return d2==UNKNOWN_DIMENSION || d1==d2;
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}
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// These tag classes help dispatching functions based on a geometric dimension.
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template < int dim >
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struct Dimension_tag
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{
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static const int value = dim;
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};
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struct Dynamic_dimension_tag {};
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namespace internal {
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template < typename D >
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struct Dim_value {
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static const int value = D::value;
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};
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template <>
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struct Dim_value <Dynamic_dimension_tag> {};
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} // namespace internal
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// Ambient_dimension gives access to the dimension of the ambient space of an object.
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template < typename T, typename K = typename Kernel_traits<T>::Kernel >
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struct Ambient_dimension
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: public internal::Dim_value< typename K::template Ambient_dimension<T>::type >
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{
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typedef typename K::template Ambient_dimension<T>::type type;
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};
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// Feature_dimension gives access to the dimension of an object.
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template < typename T, typename K = typename Kernel_traits<T>::Kernel >
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struct Feature_dimension
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: public internal::Dim_value< typename K::template Feature_dimension<T>::type >
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{
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typedef typename K::template Feature_dimension<T>::type type;
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};
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// Change the dimension
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template<class D,int i=1>struct Increment_dimension {
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typedef Dynamic_dimension_tag type;
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};
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template<int d,int i>struct Increment_dimension<Dimension_tag<d>,i> {
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typedef Dimension_tag<d+i> type;
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};
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template<class D1,class D2>struct Product_dimension {
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typedef Dynamic_dimension_tag type;
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};
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template<int d1,int d2>struct Product_dimension<Dimension_tag<d1>,Dimension_tag<d2> > {
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typedef Dimension_tag<d1*d2> type;
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};
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#ifdef CGAL_EIGEN3_ENABLED
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// Convert to Eigen's notion of dimension
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template <class Dim_> struct Eigen_dimension {
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enum { value=Eigen::Dynamic };
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};
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template <int d> struct Eigen_dimension<Dimension_tag<d> > {
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enum { value=d };
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};
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// and convert back
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template <int d> struct Dimension_eigen {
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typedef Dimension_tag<d> type;
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};
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template <> struct Dimension_eigen<Eigen::Dynamic> {
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typedef Dynamic_dimension_tag type;
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};
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#endif
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} //namespace CGAL
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#endif // CGAL_DIMENSION_H
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