kjs Library: scope_chain.h Source File (kjs Library)

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# scope_chain.h

    00001 /*
    00002  *  This file is part of the KDE libraries
    00003  *  Copyright (C) 2003 Apple Computer, Inc.
    00004  *
    00005  *  This library is free software; you can redistribute it and/or
    00006  *  modify it under the terms of the GNU Library General Public
    00007  *  License as published by the Free Software Foundation; either
    00008  *  version 2 of the License, or (at your option) any later version.
    00009  *
    00010  *  This library is distributed in the hope that it will be useful,
    00011  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
    00012  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00013  *  Library General Public License for more details.
    00014  *
    00015  *  You should have received a copy of the GNU Library General Public License
    00016  *  along with this library; see the file COPYING.LIB.  If not, write to
    00017  *  the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    00018  *  Boston, MA 02111-1307, USA.
    00019  *
    00020  */
    00021
    00022 #ifndef KJS_SCOPE_CHAIN_H
    00023 #define KJS_SCOPE_CHAIN_H
    00024
    00025 #include <kjs/global.h>
    00026
    00027 namespace KJS {
    00028
    00029     class ObjectImp;
    00030
    00034     class KJS_EXPORT ScopeChainNode {
    00035     public:
    00036         ScopeChainNode(ScopeChainNode *n, ObjectImp *o)
    00037             : next(n), object(o), refCount(1) { }
    00038
    00039         ScopeChainNode *next;
    00040         ObjectImp *object;
    00041         int refCount;
    00042     };
    00043
    00047     class KJS_EXPORT ScopeChain {
    00048     public:
    00049         ScopeChain() : _node(0) { }
    00050         ~ScopeChain() { deref(); }
    00051
    00052         ScopeChain(const ScopeChain &c) : _node(c._node)
    00053             { if (_node) ++_node->refCount; }
    00054         ScopeChain &operator=(const ScopeChain &);
    00055
    00056         bool isEmpty() const { return !_node; }
    00057         ObjectImp *top() const { return _node->object; }
    00058         ObjectImp *bottom() const { const ScopeChainNode *n = _node;
    00059                     while (n->next) n = n->next;
    00060                     return n->object; }
    00061
    00062         void clear() { deref(); _node = 0; }
    00063         void push(ObjectImp *);
    00064         void pop();
    00065
    00066         void mark();
    00067
    00068     private:
    00069         ScopeChainNode *_node;
    00070
    00071         void deref() { if (_node && --_node->refCount == 0) release(); }
    00072         void ref() const;
    00073
    00074         void release();
    00075     };
    00076
    00077 } // namespace KJS
    00078
    00079 #endif // KJS_SCOPE_CHAIN_H

This file is part of the documentation for kjs Library Version 3.4.1.
Documentation copyright © 1996-2004 the KDE developers.
Generated on Sat Jun 11 20:23:07 2005 by doxygen 1.4.1 written by Dimitri van Heesch, © 1997-2003