144 lines
3 KiB
C++
144 lines
3 KiB
C++
/*
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* Copyright (c) 2001-2008
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* DecisionSoft Limited. All rights reserved.
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* Copyright (c) 2004-2008
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* Oracle. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* $Id: ReferenceCounted.hpp,v 1.9 2008/01/08 18:47:30 jpcs Exp $
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*/
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#ifndef _REFERENCECOUNTED_HPP
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#define _REFERENCECOUNTED_HPP
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#include <xqilla/framework/XQillaExport.hpp>
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#include <xercesc/framework/MemoryManager.hpp>
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// for null RefCountPointer instances
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#define NULLRCP ((void *)0)
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/** Super class for reference counted classes */
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class XQILLA_API ReferenceCounted
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{
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public:
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ReferenceCounted()
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: _ref_count(0) {}
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virtual ~ReferenceCounted() {}
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/// Increment the reference count
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void incrementRefCount() const
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{
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++const_cast<unsigned int&>(_ref_count);
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}
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/// Decrement the reference count, deleting if it becomes zero
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virtual void decrementRefCount() const
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{
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if(--const_cast<unsigned int&>(_ref_count) == 0) {
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delete this;
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}
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}
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protected:
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unsigned int _ref_count; // mutable
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};
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/** Super class of all the reference counted wrappers for Items */
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template<class T> class RefCountPointer
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{
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public:
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RefCountPointer(T *p = 0) : _p(p)
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{
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if(_p != 0) _p->incrementRefCount();
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}
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template<class T2> RefCountPointer(const RefCountPointer<T2> &o) : _p((T*)(T2*)o)
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{
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if(_p != 0) _p->incrementRefCount();
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}
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RefCountPointer(const RefCountPointer<T> &o) : _p(o._p)
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{
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if(_p != 0) _p->incrementRefCount();
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}
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RefCountPointer &operator=(const RefCountPointer<T> &o)
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{
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if(_p != o._p) {
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if(_p != 0) _p->decrementRefCount();
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_p = o._p;
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if(_p != 0) _p->incrementRefCount();
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}
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return *this;
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}
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~RefCountPointer()
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{
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if(_p != 0) _p->decrementRefCount();
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}
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T *operator->() const
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{
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return _p;
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}
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operator T*() const
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{
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return _p;
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}
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T *get() const
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{
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return _p;
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}
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bool isNull() const
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{
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return (_p == 0);
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}
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bool notNull() const
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{
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return (_p != 0);
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}
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protected:
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T *_p;
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};
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template<class T1, class T2>
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inline bool operator==(const RefCountPointer<T1> &a, const RefCountPointer<T2> &b)
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{
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return (void*)(T1*)a == (void*)(T2*)b;
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}
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template<class T1, class T2>
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inline bool operator!=(const RefCountPointer<T1> &a, const RefCountPointer<T2> &b)
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{
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return (void*)(T1*)a != (void*)(T2*)b;
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}
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template<class T>
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inline bool operator==(const RefCountPointer<T> &a, void *b)
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{
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return (T*)a == (T*)b;
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}
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template<class T>
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inline bool operator!=(const RefCountPointer<T> &a, void *b)
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{
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return (T*)a != (T*)b;
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}
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#endif
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