/usr/include/CGAL/Iterator_project.h is in libcgal-dev 4.2-5ubuntu1.
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) : Michael Hoffmann <hoffmann@inf.ethz.ch>
// Lutz Kettner <kettner@mpi-sb.mpg.de>
// Sylvain Pion
#ifndef CGAL_ITERATOR_PROJECT_H
#define CGAL_ITERATOR_PROJECT_H 1
#include <iterator>
namespace CGAL {
// Relies on iterator traits. Quite simplified compared to earlier version.
// The pointer type and the reference type in the Iterator_project
// are based on the value type from the projector, but the base iterator
// determines whether they are const or mutable. The following template
// class and its partial specialization helps creating the derived types.
// If T === T1 return R1 else return R2
template <class T, class T1, class R1, class R2>
struct I_TYPE_MATCH_IF { typedef R2 Result; }; // else clause
template <class T, class R1, class R2>
struct I_TYPE_MATCH_IF<T,T,R1,R2> { typedef R1 Result; }; // then clause
// keep 4 dummy template parameters around for backwards compatibility
template < class I, class Fct,
class D1 = int, class D2 = int, class D3 = int, class D4 = int >
class Iterator_project {
protected:
I nt; // The internal iterator.
public:
typedef Iterator_project<I,Fct,D1,D2,D3,D4> Self;
typedef I Iterator; // base iterator
typedef std::iterator_traits<I> traits;
typedef typename traits::difference_type difference_type;
typedef typename traits::iterator_category iterator_category;
typedef typename traits::value_type base_value_type;
typedef typename traits::pointer base_pointer;
typedef typename traits::reference base_reference;
typedef typename Fct::argument_type argument_type;
typedef typename Fct::result_type value_type;
// Use I_TYPE_MATCH_IF to find correct pointer and reference type.
typedef I_TYPE_MATCH_IF< base_reference, const base_value_type &,
const value_type &, value_type &> Match1;
typedef typename Match1::Result reference;
typedef I_TYPE_MATCH_IF< base_pointer, const base_value_type *,
const value_type *, value_type *> Match2;
typedef typename Match2::Result pointer;
// CREATION
// --------
Iterator_project() {}
Iterator_project( I j) : nt(j) {}
// make two iterators assignable if the underlying iterators are
template <class I2, class Q1, class Q2, class Q3, class Q4>
Iterator_project( const Iterator_project<I2,Fct,Q1,Q2,Q3,Q4>& i2)
: nt( i2.current_iterator()) {}
template <class I2, class Q1, class Q2, class Q3, class Q4>
Self& operator= ( const Iterator_project<I2,Fct,Q1,Q2,Q3,Q4>& i2) {
nt = i2.current_iterator();
return *this;
}
// OPERATIONS Forward Category
// ---------------------------
Iterator current_iterator() const { return nt;}
pointer ptr() const {
Fct fct;
return &(fct(*nt));
}
bool operator==( const Self& i) const { return ( nt == i.nt); }
bool operator!=( const Self& i) const { return !(*this == i); }
reference operator* () const { return *ptr(); }
pointer operator->() const { return ptr(); }
Self& operator++() {
++nt;
return *this;
}
Self operator++(int) {
Self tmp = *this;
++*this;
return tmp;
}
// OPERATIONS Bidirectional Category
// ---------------------------------
Self& operator--() {
--nt;
return *this;
}
Self operator--(int) {
Self tmp = *this;
--*this;
return tmp;
}
// OPERATIONS Random Access Category
// ---------------------------------
Self& operator+=( difference_type n) {
nt += n;
return *this;
}
Self operator+( difference_type n) const {
Self tmp = *this;
return tmp += n;
}
Self& operator-=( difference_type n) {
return operator+=( -n);
}
Self operator-( difference_type n) const {
Self tmp = *this;
return tmp += -n;
}
difference_type operator-( const Self& i) const { return nt - i.nt; }
reference operator[]( difference_type n) const {
Self tmp = *this;
tmp += n;
return tmp.operator*();
}
bool operator< ( const Self& i) const { return ( nt < i.nt); }
bool operator> ( const Self& i) const { return i < *this; }
bool operator<=( const Self& i) const { return !(i < *this); }
bool operator>=( const Self& i) const { return !(*this < i); }
};
template < class Dist, class Fct, class I,
class D1, class D2, class D3, class D4>
inline
Iterator_project<I,Fct,D1,D2,D3,D4>
operator+( Dist n, Iterator_project<I,Fct,D1,D2,D3,D4> i) {
return i += n;
}
} //namespace CGAL
#endif // CGAL_ITERATOR_PROJECT_H //
// EOF //
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