RE: arithmetic functions

[Jorge M. Pelizzoni]

Here is a way round your problem, which should comply with any Prolog.
Notice that any expression that is evaluated through 'is'/2 is handled
equally by 'my_is'/2.

Cheers,

Jorge.

> -----Original Message-----
> From: address@hidden
[mailto:users-
> address@hidden On Behalf Of Jeff
Koster
> Sent: Friday, February 07, 2003 8:55 PM
> To: address@hidden
> Subject: arithmetic functions
> 
> Hi,
> 
> Does anyone know of a way to implement arithmetic functions in
gprolog?
> I'm
> porting over from SWI which allows:
> -------
> :- op(25,xf,[minutes]).
> :- arithmetic_function(minutes/1).
> minutes(M,S) :-
>       S is M * 60.
> -------
> enabling me to use 'minutes' as a function, for example:
>       ?- Time is 3 minutes.
> would produce
>       Time = 180
> 
> The efficiency of these particular operators is not of major
importance in
> my
> application.
> 
> Thanks in advance,
> J.
> 
> 
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my_is.pro
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