// Can be copied with sharing iff reference is within sheet
public override Expr CopyTo(int col, int row)
{
if (raref.ValidAt(col, row))
{
return(this);
}
return
(Error.refError);
}
// Can copy cell area with sharing iff corners are within sheet
public override Expr CopyTo(int col, int row)
{
if (ul.ValidAt(col, row) && lr.ValidAt(col, row))
{
return(this);
}
else
{
return(Error.refError);
}
}