138 lines
3.7 KiB
C++
138 lines
3.7 KiB
C++
// Copyright (c) 2003
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// Utrecht University (The Netherlands),
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// ETH Zurich (Switzerland),
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// INRIA Sophia-Antipolis (France),
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// Max-Planck-Institute Saarbruecken (Germany),
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// and Tel-Aviv University (Israel). All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org)
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//
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// $URL: https://github.com/CGAL/cgal/blob/v5.1/STL_Extension/include/CGAL/Circulator_identity.h $
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// $Id: Circulator_identity.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
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// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
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//
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//
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// Author(s) : Michael Hoffmann <hoffmann@inf.ethz.ch>
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// Lutz Kettner <kettner@mpi-sb.mpg.de>
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// Sylvain Pion
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#ifndef CGAL_CIRCULATOR_IDENTITY_H
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#define CGAL_CIRCULATOR_IDENTITY_H 1
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#include <CGAL/circulator.h>
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namespace CGAL {
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template < class C,
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class Ref = typename C::reference,
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class Ptr = typename C::pointer>
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class Circulator_identity {
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protected:
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C nt; // The internal circulator.
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public:
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typedef C Circulator;
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typedef Circulator_identity<C,Ref,Ptr> Self;
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typedef typename C::iterator_category iterator_category;
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typedef typename C::value_type value_type;
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typedef typename C::difference_type difference_type;
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typedef typename C::size_type size_type;
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typedef typename C::reference reference;
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typedef typename C::pointer pointer;
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// CREATION
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// --------
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Circulator_identity() {}
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Circulator_identity( Circulator j) : nt(j) {}
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// OPERATIONS Forward Category
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// ---------------------------
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Circulator current_circulator() const { return nt;}
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bool operator==( std::nullptr_t p) const {
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CGAL_assertion( p == 0);
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CGAL_USE(p);
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return ( nt == 0); //###//
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}
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bool operator!=( std::nullptr_t p) const {
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return !(*this == p);
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}
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bool operator==( const Self& i) const {
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return ( nt == i.nt); //###//
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}
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bool operator!=( const Self& i) const {
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return !(*this == i);
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}
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Ref operator*() const {
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return *nt; //###//
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}
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Ptr operator->() const {
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return nt.operator->(); //###//
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}
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Self& operator++() {
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++nt; //###//
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return *this;
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}
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Self operator++(int) {
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Self tmp = *this;
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++*this;
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return tmp;
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}
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// OPERATIONS Bidirectional Category
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// ---------------------------------
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Self& operator--() {
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--nt; //###//
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return *this;
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}
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Self operator--(int) {
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Self tmp = *this;
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--*this;
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return tmp;
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}
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// OPERATIONS Random Access Category
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// ---------------------------------
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Self min_circulator() const {
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return Self( nt.min_circulator()); //###//
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}
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Self& operator+=( difference_type n) {
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nt += n; //###//
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return *this;
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}
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Self operator+( difference_type n) const {
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Self tmp = *this;
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return tmp += n;
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}
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Self& operator-=( difference_type n) {
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return operator+=( -n);
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}
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Self operator-( difference_type n) const {
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Self tmp = *this;
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return tmp += -n;
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}
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difference_type operator-( const Self& i) const {
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return nt - i.nt; //###//
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}
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Ref operator[]( difference_type n) const {
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Self tmp = *this;
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tmp += n;
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return tmp.operator*();
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}
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};
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template < class Dist, class C, class Ref, class Ptr>
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inline
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Circulator_identity<C,Ref,Ptr>
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operator+( Dist n, Circulator_identity<C,Ref,Ptr> i) {
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return i += n;
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}
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} //namespace CGAL
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#endif // CGAL_CIRCULATOR_IDENTITY_H //
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// EOF //
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