[m-users.] Display all predicate values

[Sean Charles (emacstheviking)]

Try the solutions module.


> On 18 May 2021, at 12:47, Philippe de Rochambeau <phiroc at free.fr> wrote:
> 
> 
> Hello,
> what is the idiomatic way in Mercury to display all values that match the friend  predicate?
> 
> 
> :- pred friend(string).
> :- mode friend(out).
> friend("Mark").
> friend("Jack").
> friend("Andrew »).
> 
> main(!IO) :-
>   friend(Who),
>   lookup(Who, 1, Val),
>   io.write(Who, !IO).
> 
> 
> I’ve tried using lookup, but it’s Who is not an array.
> 
> Many thanks.
> 
> Best regards,
> 
> Philippe
> 
> 
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