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defineVI.h

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#ifndef defineVI_h
#define defineVI_h
//-------------------------------------
/*! 
<ul>
        <li> A derived class of defineVI can check at run-time if it has been already defined or not.
        If not, it can execute the \c define() method and define itself. 
        <li> Lets consider the example of multialgorithms, that used other algorithms.
        At compile time maybe some algorithms are not beed defined yet. The class
        is therefore not defined at compile time. At run time, when the
        \c initialize() (of algorithmVI) method is executed the first time,
        the derived class will them execute its \c define() method and define its algorithms. 
        Setting the \c setDefine() to true, the define() method will not be executed again. 
        <li> This class is useful to retreive at one, pointers that will keep their address
        constant during the live of the class.
</ul>
*/
//-------------------------------------
// JA Hernando, Santa Cruz, CA, 05/15/00
//-------------------------------------
//#####################################
class defineVI
//#####################################
{
protected:

        defineVI() {setDefine(false);}
        virtual ~defineVI() {};

        virtual void define() = 0;

        void setDefine(bool t)  {m_define = t;}
        bool defined() const {return m_define;}

private:

        bool m_define;
};
#endif

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