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/** \file
* Inkscape::GC::soft_ptr - "soft" pointers to avoid finalization cycles
*
* Copyright 2006 MenTaLguY <mental@rydia.net>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* See the file COPYING for details.
*
*/
#ifndef SEEN_INKSCAPE_GC_SOFT_PTR_H
#define SEEN_INKSCAPE_GC_SOFT_PTR_H
#include "gc-core.h"
namespace Inkscape {
namespace GC {
/** @brief A class for pointers which can be automatically cleared to break
* finalization cycles.
*/
template <typename T>
class soft_ptr {
public:
soft_ptr(T *pointer=NULL) : _pointer(pointer) {
_register();
}
operator T *() const { return static_cast<T *>(_pointer); }
T &operator*() const { return *static_cast<T *>(_pointer); }
T *operator->() const { return static_cast<T *>(_pointer); }
T &operator[](int i) const { return static_cast<T *>(_pointer)[i]; }
soft_ptr &operator=(T *pointer) {
_pointer = pointer;
return *this;
}
// default copy
private:
void _register() {
void *base=Core::base(this);
if (base) {
Core::general_register_disappearing_link(&_pointer, base);
}
}
void *_pointer;
};
}
}
#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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