**fig4_17.txt**

/* 1*/	template <class Etype>
/* 2*/	const Binary_Search_Tree<Etype> &
/* 3*/	Binary_Search_Tree<Etype>::
/* 4*/	operator = ( const Binary_Search_Tree<Etype> & Value )
/* 5*/	{
/* 6*/	    if( this != &Value )
/* 7*/	    {
/* 8*/	        Make_Empty( Root );
/* 9*/	        Root = Copy( Value.Root );
/*10*/	        Last_Find = Root;
/*11*/	    }
/*12*/	    return *this;
/*13*/	}

/*14*/	template <class Etype>
/*15*/	Tree_Node<Etype> *
/*16*/	Binary_Search_Tree<Etype>::
/*17*/	Copy( const Tree_Node<Etype> *T )
/*18*/	{
/*19*/	    if( T != NULL )
/*20*/	        return new Tree_Node<Etype>
/*21*/	            ( T->Element, Copy( T->Left ), Copy( T->Right ) );
/*22*/	    else
/*23*/	        return NULL;
/*24*/	}