envi-code/SourceCode/Code2026/tg_shs/inc/geo/TWPushVar.h

//-----------------------------------------------------------------------------+
// Copyright (C), 1998-2007, Beijing Tangent Software Co. Ltd.
// = FileName	:   TWPushVar.h
// = Version	:   ver2.0
// = Author		:   xlc
// = CreateDate	:   2002-09-09
// = Description:   类的声明
// = Maintainers: 
//                  
//-----------------------------------------------------------------------------+
#ifndef _TWPUSHVAR_H_
#define _TWPUSHVAR_H_

//临时控制变量
template<class T> class TWPushVar
{
public:
	
	virtual ~TWPushVar();

	TWPushVar(T&variable,const T&newData);
	
	const T& GetOldData()const;

protected:
	const T oldData;
	T &var;
};

template<class T> 
TWPushVar<T>::TWPushVar(T&variable,const T&newData)
: oldData(variable),var(variable)
{
	var = newData;
}

template<class T> 
TWPushVar<T>::~TWPushVar()
{
	var = oldData;
}

template<class T> 
const T& TWPushVar<T>::GetOldData()const
{
	return oldData;
}

#endif