private static bool BinaryOp(Preis x, Preis y, Func <decimal, decimal, bool> op)
{
if (object.ReferenceEquals(x, null) || object.ReferenceEquals(y, null))
{
throw new ArgumentNullException();
}
if (x.Unit == y.Unit)
{
return(op(x.Amount, y.Amount));
}
return(op(x.Amount, y.ConvertTo(x.Unit).Amount));
}
