public override bool Equals(Object obj)
{
AreaArithmeticOperation aao = obj as AreaArithmeticOperation;
if (aao == null)
{
return(false);
}
return(leftExp.Equals(aao.leftExp) && rightExp.Equals(aao.rightExp) ||
leftExp.Equals(aao.rightExp) && rightExp.Equals(aao.leftExp) && base.Equals(obj));
}
public override Expr Substitute(Region toFind, Expr toSub)
{
return(theRegion.Equals(toFind) ? toSub : this);
}