[REBOL] Re: native? :==
From: holger:rebol at: 4-Feb-2002 7:15
On Mon, Feb 04, 2002 at 12:44:51AM -0600, Joel Neely wrote:
> Hi, Hallvard,
>
> Hallvard Ystad wrote:
> >
> > Why is this:
> >
> > >> native? :> > == false
> >
>
> Perhaps for the same reason as this existentialist error message:
No :).
> >> pair? 1x1
> == true
> >> pair? 2x2
> == true
> >> 1x1 < 2x2
> ** Script Error: Expected one of: pair! - not: pair!
> ** Near: 1x1 < 2x2
Yes, the error message is less than informative :). The reason for
it is sound though. Multi-dimensional entities such as pairs do not
have a useful total ordering, i.e. less than/greater than comparisons
are not always possible (e.g. what is 1x2 < 2x1 supposed to return ?).
If they were allowed by the language (as in early versions of View)
that could lead to difficult to track down bugs in scripts.
--
Holger Kruse
[holger--rebol--com]
