flagjanitor.c

来自「IBM的解析xml的工具Xerces的源代码」· C语言 代码 · 共 88 行

/*
 * Copyright 1999-2000,2004 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * $Log: FlagJanitor.c,v $
 * Revision 1.4  2004/09/08 13:56:21  peiyongz
 * Apache License Version 2.0
 *
 * Revision 1.3  2004/01/29 11:48:46  cargilld
 * Code cleanup changes to get rid of various compiler diagnostic messages.
 *
 * Revision 1.2  2002/11/04 15:22:03  tng
 * C++ Namespace Support.
 *
 * Revision 1.1.1.1  2002/02/01 22:22:10  peiyongz
 * sane_include
 *
 * Revision 1.3  2000/03/02 19:54:39  roddey
 * This checkin includes many changes done while waiting for the
 * 1.1.0 code to be finished. I can't list them all here, but a list is
 * available elsewhere.
 *
 * Revision 1.2  2000/02/06 07:48:01  rahulj
 * Year 2K copyright swat.
 *
 * Revision 1.1.1.1  1999/11/09 01:04:15  twl
 * Initial checkin
 *
 * Revision 1.2  1999/11/08 20:45:06  rahul
 * Swat for adding in Product name and CVS comment log variable.
 *
 */


// ---------------------------------------------------------------------------
//  Includes
// ---------------------------------------------------------------------------
#if defined(XERCES_TMPLSINC)
#include <xercesc/util/FlagJanitor.hpp>
#endif

XERCES_CPP_NAMESPACE_BEGIN

// ---------------------------------------------------------------------------
//  Constructors and Destructor
// ---------------------------------------------------------------------------
template <class T> FlagJanitor<T>::FlagJanitor(T* const valPtr, const T newVal)
:   fValPtr(valPtr)
{
    // Store the pointer, save the org value, and store the new value    
    if (fValPtr)
    {
        fOldVal = *fValPtr;
        *fValPtr = newVal;
    }
}

template <class T> FlagJanitor<T>::~FlagJanitor()
{
    // Restore the old value
    if (fValPtr)
        *fValPtr = fOldVal;
}


// ---------------------------------------------------------------------------
//  Value management methods
// ---------------------------------------------------------------------------
template <class T> void FlagJanitor<T>::release()
{
    fValPtr = 0;
}

XERCES_CPP_NAMESPACE_END