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// Copyright (c) 2003-2004 INRIA Sophia-Antipolis (France).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1.1/Mesh_2/include/CGAL/Filter_circulator.h $
// $Id: include/CGAL/Filter_circulator.h 08b27d3db14 $
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s) : Laurent RINEAU
#ifndef CGAL_FILTRED_CIRCULATOR_H
#define CGAL_FILTRED_CIRCULATOR_H
#include <CGAL/license/Mesh_2.h>
#include <CGAL/config.h>
#include <CGAL/assertions.h>
namespace CGAL {
template <class Circ, class Pred>
class Filter_circulator : public Circ
{
bool is_null;
Pred test;
public:
typedef Filter_circulator<Circ,Pred> Self;
Filter_circulator(const Pred p=Pred()): is_null(true), test(p) {}
Filter_circulator(const Self& c): Circ(c), is_null(c.is_null),
test(c.test) {}
Self& operator=(const Self& c)
{
//this->Circ::operator=(c); // This does not work with bcc
//*this = c; // This does not work with VC++6
static_cast<Circ&>(*this) = static_cast<const Circ&>(c);
is_null=c.is_null;
test=c.test;
return *this;
}
Filter_circulator(const Circ& c, const Pred& p=Pred())
: test(p)
{
Circ circ(c);
if(test(circ))
is_null=false;
else
{
Circ end(c);
do {
++circ;
} while( !test(circ) && end != circ );
is_null = (end == circ);
}
static_cast<Circ&>(*this) = circ;
CGAL_assertion(is_null || test(*this));
}
bool operator==( std::nullptr_t ) const {
return is_null;
}
bool operator!=( std::nullptr_t ) const {
return !is_null;
}
bool operator==(const Self& c) const
{
return is_null==c.is_null && this->Circ::operator==(c);
}
bool operator!=( const Self& c) const { return !(*this == c); }
Self& operator++() {
CGAL_assertion(!is_null);
do {
this->Circ::operator++();
} while( !test(static_cast<Circ&>(*this)) );
CGAL_assertion(is_null || test(static_cast<Circ&>(*this)));
return *this;
}
Self operator++(int) {
Self tmp= *this;
++*this;
return tmp;
}
};
}
#endif
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