src/util/CountedPointer.c

/*
 * The Apache Software License, Version 1.1
 * 
 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 * 
 * 4. The names "Xerces" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written 
 *    permission, please contact apache\@apache.org.
 * 
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 * 
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 * 
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation, and was
 * originally based on software copyright (c) 1999, International
 * Business Machines, Inc., http://www.ibm.com .  For more information
 * on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

/**
 * $Log$
 * Revision 1.1  1999/11/09 01:04:12  twl
 * Initial revision
 *
 * Revision 1.2  1999/11/08 20:45:05  rahul
 * Swat for adding in Product name and CVS comment log variable.
 *
 */


// ---------------------------------------------------------------------------
//  Includes
// ---------------------------------------------------------------------------
#if defined(XML4C_TMPLSINC)
#include <util/CountedPointer.hpp>
#endif



// ---------------------------------------------------------------------------
//  CountedPointerTo: Constructors and Destructor
// ---------------------------------------------------------------------------
template <class T> CountedPointerTo<T>::
CountedPointerTo(const CountedPointerTo<T>& toCopy) :

    fPtr(toCopy.fPtr)
{
    if (fPtr)
        fPtr->addRef();
}

template <class T> CountedPointerTo<T>::CountedPointerTo(T* p) :

    fPtr(p)
{
    if (fPtr)
        fPtr->addRef();
}

template <class T> CountedPointerTo<T>::~CountedPointerTo()
{
    if (fPtr)
        fPtr->removeRef();
}


// ---------------------------------------------------------------------------
//  CountedPointerTo: Operators
// ---------------------------------------------------------------------------
template <class T> CountedPointerTo<T>&
CountedPointerTo<T>::operator=(const CountedPointerTo<T>& other)
{
    if (this == &other)
        return *this;

    if (other.fPtr)
        other.fPtr->addRef();

    if (fPtr)
        fPtr->removeRef();

    fPtr = other.fPtr;
    return *this;
}

template <class T> CountedPointerTo<T>::operator T*()
{
    return fPtr;
}

template <class T> const T* CountedPointerTo<T>::operator->() const
{
    return fPtr;
}

template <class T> T* CountedPointerTo<T>::operator->()
{
    return fPtr;
}

template <class T> const T& CountedPointerTo<T>::operator*() const
{
    if (!fPtr)
        ThrowXML(NullPointerException, XML4CExcepts::CPtr_PointerIsZero);
    return *fPtr;
}

template <class T> T& CountedPointerTo<T>::operator*()
{
    if (!fPtr)
        ThrowXML(NullPointerException, XML4CExcepts::CPtr_PointerIsZero);
    return *fPtr;
}