Re: Ann: delay pack

Wow. I find it surprising that delay/1 didn't already exist.  Could
someone more experienced comment as to previous approaches?

A minor suggestion, could you document how to support other
predicates?  The code is clear enough that I can almost figure it out,
but a little help would be nice.

Thanks for sharing that.

On Fri, Aug 9, 2013 at 10:25 AM, Michael Hendricks <[email protected]> wrote:
> I've just released a pack which helps avoid instantiation errors with
> built-in predicates.  By using delay/1 a single clause can operate in many
> modes without manually re-ordering goals.  You can read the full
> documentation <http://www.swi-prolog.org/pack/list?p=delay> for details.
>  Here's a quick demo:
>
> ?- delay(succ(A,B)), A=1.
> A = 1,
> B = 2.
>
> ?- delay(plus(A,3,C)), C=5.
> A = 2,
> C = 5.
>
> ?- delay(univ(T,Name,Args)), Name=hello, Args=[world].
> T = hello(world),
> Name = hello,
> Args = [world].
>
> I finally got tired enough of writing the same when/2 goals over and over
> that I figured it was time for a library.  I find this style especially
> helpful with DCGs where it allows predicates to both generate and parse
> content with a single definition.
>
> As always, feedback, criticism and pull requests are welcome.
>
> --
> Michael
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-- 
Ian Tegebo