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gc-soft-ptr.h

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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>
00028 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++
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  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:encoding=utf-8:textwidth=99 :

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