53 lines
1.2 KiB
Prolog
53 lines
1.2 KiB
Prolog
% A library to implement queues of NB Terms
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:- module(nbqueue, [
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nb_enqueue/2,
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nb_dequeue/2,
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nb_clean_queue/1,
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nb_size/2
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]).
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:- unhide('$init_nb_queue').
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:- unhide('$nb_enqueue').
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:- unhide('$nb_dequeue').
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nb_enqueue(Name,El) :- var(Name),
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throw(error(instantiation_error(Name),nb_enqueue(Name,El))).
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nb_enqueue(Name,El) :- \+ atom(Name), !,
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throw(error(type_error_atom(Name),nb_enqueue(Name,El))).
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nb_enqueue(Name,El) :-
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recorded('$nb_queue',[Name|Ref],_), !,
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prolog:'$nb_enqueue'(Ref, El).
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nb_enqueue(Name,El) :-
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prolog:'$init_nb_queue'(Ref),
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recorda('$nb_queue',[Name|Ref],_),
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prolog:'$nb_enqueue'(Ref,El).
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nb_dequeue(Name,El) :- var(Name),
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throw(error(instantiation_error(Name),nb_dequeue(Name,El))).
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nb_dequeue(Name,El) :- \+ atom(Name), !,
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throw(error(type_error_atom(Name),nb_dequeue(Name,El))).
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nb_dequeue(Name,El) :-
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recorded('$nb_queue',[Name|Ref],R),
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( prolog:'$nb_dequeue'(Ref, El) ->
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true
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;
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erase(R),
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fail
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).
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nb_clean_queue(Name) :-
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recorded('$nb_queue',[Name|Ref],R), !,
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erase(R),
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nb_dequeue_all(Ref).
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nb_clean_queue(_).
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nb_dequeue_all(Ref) :-
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( prolog:'$nb_dequeue'(Ref, _) -> nb_dequeue_all(Ref) ; true ).
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nb_dequeue_size(Ref, Size) :-
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prolog:'$nb_size'(Ref, Size).
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