mirror of https://github.com/CGAL/cgal
140 lines
3.8 KiB
C++
140 lines
3.8 KiB
C++
// ============================================================================
|
|
//
|
|
// Copyright (c) 2003 The CGAL Consortium
|
|
//
|
|
// This software and related documentation is part of an INTERNAL release
|
|
// of the Computational Geometry Algorithms Library (CGAL). It is not
|
|
// intended for general use.
|
|
//
|
|
// ----------------------------------------------------------------------------
|
|
//
|
|
// release : $CGAL_Revision: $
|
|
// release_date : $CGAL_Date: $
|
|
//
|
|
// file : Circulator_project.h
|
|
// chapter : $CGAL_Chapter: STL Extensions for CGAL $
|
|
// package : $CGAL_Package: STL_Extension $
|
|
// source : stl_extension.fw
|
|
// revision : $Revision$
|
|
// revision_date : $Date$
|
|
// author(s) : Michael Hoffmann <hoffmann@inf.ethz.ch>
|
|
// Lutz Kettner <kettner@mpi-sb.mpg.de>
|
|
// Sylvain Pion <Sylvain.Pion@mpi-sb.mpg.de>
|
|
//
|
|
// maintainer : Michael Hoffmann <hoffmann@inf.ethz.ch>
|
|
// coordinator : ETH
|
|
//
|
|
// An circulator adaptor performing a projection on the value type.
|
|
// ============================================================================
|
|
|
|
#ifndef CGAL_CIRCULATOR_PROJECT_H
|
|
#define CGAL_CIRCULATOR_PROJECT_H 1
|
|
#include <CGAL/circulator.h>
|
|
|
|
CGAL_BEGIN_NAMESPACE
|
|
|
|
template < class C,
|
|
class Fct,
|
|
class Ref = typename C::reference,
|
|
class Ptr = typename C::pointer>
|
|
class Circulator_project {
|
|
protected:
|
|
C nt; // The internal circulator.
|
|
public:
|
|
typedef C Circulator;
|
|
typedef Circulator_project<C,Fct,Ref,Ptr> Self;
|
|
|
|
typedef typename C::iterator_category iterator_category;
|
|
typedef typename Fct::result_type value_type;
|
|
typedef typename C::difference_type difference_type;
|
|
typedef typename C::size_type size_type;
|
|
typedef Ref reference;
|
|
typedef Ptr pointer;
|
|
|
|
// CREATION
|
|
// --------
|
|
|
|
Circulator_project() {}
|
|
Circulator_project( Circulator j) : nt(j) {}
|
|
|
|
// OPERATIONS Forward Category
|
|
// ---------------------------
|
|
|
|
Circulator current_circulator() const { return nt;}
|
|
Ptr ptr() const {
|
|
Fct fct;
|
|
return &(fct(*nt));
|
|
}
|
|
|
|
bool operator==( CGAL_NULL_TYPE p) const {
|
|
CGAL_assertion( p == 0);
|
|
return ( nt == 0);
|
|
}
|
|
bool operator!=( CGAL_NULL_TYPE p) const { return !(*this == p); }
|
|
bool operator==( const Self& i) const { return ( nt == i.nt); }
|
|
bool operator!=( const Self& i) const { return !(*this == i); }
|
|
Ref operator*() const { return *ptr(); }
|
|
Ptr 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 min_circulator() const {
|
|
return Self( nt.min_circulator());
|
|
}
|
|
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;
|
|
}
|
|
Ref operator[]( difference_type n) const {
|
|
Self tmp = *this;
|
|
tmp += n;
|
|
return tmp.operator*();
|
|
}
|
|
};
|
|
|
|
template < class Dist, class Fct, class C, class Ref, class Ptr>
|
|
inline
|
|
Circulator_project<C,Fct,Ref,Ptr>
|
|
operator+( Dist n, Circulator_project<C,Fct,Ref,Ptr> i) { return i += n; }
|
|
|
|
CGAL_END_NAMESPACE
|
|
#endif // CGAL_CIRCULATOR_PROJECT_H //
|
|
// EOF //
|