/usr/include/CGAL/Triangle_3.h is in libcgal-dev 4.11-2build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Utrecht University (The Netherlands),
// ETH Zurich (Switzerland),
// INRIA Sophia-Antipolis (France),
// Max-Planck-Institute Saarbruecken (Germany),
// and Tel-Aviv University (Israel). All rights reserved.
//
// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 3 of the License,
// or (at your option) any later version.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL$
// $Id$
//
//
// Author(s) : Andreas Fabri, Stefan Schirra
#ifndef CGAL_TRIANGLE_3_H
#define CGAL_TRIANGLE_3_H
#include <CGAL/assertions.h>
#include <boost/type_traits/is_same.hpp>
#include <CGAL/Kernel/Return_base_tag.h>
#include <CGAL/Bbox_3.h>
#include <CGAL/Dimension.h>
namespace CGAL {
template <class R_>
class Triangle_3 : public R_::Kernel_base::Triangle_3
{
typedef typename R_::RT RT;
typedef typename R_::FT FT;
typedef typename R_::Point_3 Point_3;
typedef typename R_::Plane_3 Plane_3;
typedef typename R_::Aff_transformation_3 Aff_transformation_3;
typedef Triangle_3 Self;
CGAL_static_assertion((boost::is_same<Self, typename R_::Triangle_3>::value));
public:
typedef Dimension_tag<3> Ambient_dimension;
typedef Dimension_tag<2> Feature_dimension;
typedef typename R_::Kernel_base::Triangle_3 Rep;
const Rep& rep() const
{
return *this;
}
Rep& rep()
{
return *this;
}
typedef R_ R;
Triangle_3() {}
Triangle_3(const Rep& t)
: Rep(t) {}
Triangle_3(const Point_3& p, const Point_3& q, const Point_3& r)
: Rep(typename R::Construct_triangle_3()(Return_base_tag(), p, q, r)) {}
Triangle_3 transform(const Aff_transformation_3 &t) const
{
return Triangle_3(t.transform(this->vertex(0)),
t.transform(this->vertex(1)),
t.transform(this->vertex(2)));
}
Plane_3 supporting_plane() const
{
return R().construct_supporting_plane_3_object()(*this);
}
bool has_on(const Point_3 &p) const
{
return R().has_on_3_object()(*this, p);
}
typename cpp11::result_of<typename R::Construct_vertex_3( Triangle_3, int )>::type
vertex(int i) const
{
return R().construct_vertex_3_object()(*this, i);
}
typename cpp11::result_of<typename R::Construct_vertex_3( Triangle_3, int )>::type
operator[](int i) const
{
return vertex(i);
}
bool is_degenerate() const
{
return R().is_degenerate_3_object()(*this);
}
Bbox_3
bbox() const
{
return R().construct_bbox_3_object()(*this);
}
FT squared_area() const // TODO : use Qrt
{
return R().compute_squared_area_3_object()(*this);
}
};
template < class R >
std::ostream &
operator<<(std::ostream &os, const Triangle_3<R> &t)
{
switch(get_mode(os)) {
case IO::ASCII :
return os << t[0] << ' ' << t[1] << ' ' << t[2];
case IO::BINARY :
return os << t[0] << t[1] << t[2];
default:
os << "Triangle_3(" << t[0] << ", " << t[1] << ", " << t[2] <<")";
return os;
}
}
template < class R >
std::istream &
operator>>(std::istream &is, Triangle_3<R> &t)
{
typename R::Point_3 p, q, r;
is >> p >> q >> r;
if (is)
t = Triangle_3<R>(p, q, r);
return is;
}
} //namespace CGAL
#endif // CGAL_TRIANGLE_3_H
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