[m-users.] Display all predicate values
phiroc at free.fr
phiroc at free.fr
Tue May 18 21:54:00 AEST 2021
Corrigendum: "but Who isn't an array". Sorry.
----- Mail original -----
De: "Philippe de Rochambeau" <phiroc at free.fr>
À: users at lists.mercurylang.org
Envoyé: Mardi 18 Mai 2021 13:47:13
Objet: [m-users.] Display all predicate values
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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