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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Inkscape::Util::ForwardPointerIterator - wraps a simple pointer
* with various strategies
* to determine sequence
*
* Authors:
* MenTaLguY <mental@rydia.net>
*
* Copyright (C) 2004 MenTaLguY
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#ifndef SEEN_INKSCAPE_UTIL_FORWARD_POINTER_ITERATOR_H
#define SEEN_INKSCAPE_UTIL_FORWARD_POINTER_ITERATOR_H
#include <iterator>
#include <cstddef>
#include "util/reference.h"
namespace Inkscape {
namespace Util {
template <typename BaseType, typename Strategy>
class ForwardPointerIterator;
template <typename BaseType, typename Strategy>
class ForwardPointerIterator<BaseType const, Strategy> {
public:
typedef std::forward_iterator_tag iterator_category;
typedef typename Traits::Reference<BaseType const>::LValue value_type;
typedef std::ptrdiff_t difference_type;
typedef typename Traits::Reference<BaseType const>::LValue reference;
typedef typename Traits::Reference<BaseType const>::RValue const_reference;
typedef typename Traits::Reference<BaseType const>::Pointer pointer;
typedef ForwardPointerIterator<BaseType const, Strategy> Self;
ForwardPointerIterator() = default;
ForwardPointerIterator(pointer p) : _p(p) {}
operator pointer() const { return _p; }
reference operator*() const { return *_p; }
pointer operator->() const { return _p; }
bool operator==(Self const &other) const {
return _p == other._p;
}
bool operator!=(Self const &other) const {
return _p != other._p;
}
Self &operator++() {
_p = Strategy::next(_p);
return *this;
}
Self operator++(int) {
Self old(*this);
operator++();
return old;
}
operator bool() const { return _p != nullptr; }
private:
pointer _p;
};
template <typename BaseType, typename Strategy>
class ForwardPointerIterator
: public ForwardPointerIterator<BaseType const, Strategy>
{
public:
typedef typename Traits::Reference<BaseType>::LValue value_type;
typedef typename Traits::Reference<BaseType>::LValue reference;
typedef typename Traits::Reference<BaseType>::RValue const_reference;
typedef typename Traits::Reference<BaseType>::Pointer pointer;
typedef ForwardPointerIterator<BaseType const, Strategy> Ancestor;
typedef ForwardPointerIterator<BaseType, Strategy> Self;
ForwardPointerIterator() : Ancestor() {}
ForwardPointerIterator(pointer p) : Ancestor(p) {}
operator pointer() const {
return const_cast<pointer>(Ancestor::operator->());
}
reference operator*() const {
return const_cast<reference>(Ancestor::operator*());
}
pointer operator->() const {
return const_cast<pointer>(Ancestor::operator->());
}
Self &operator++() {
Ancestor::operator++();
return *this;
}
Self operator++(int) {
Self old(*this);
operator++();
return old;
}
};
}
}
#endif
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
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