This library implements queues. The queue representation should be regarded as an opaque term and only accessed using the library predicates.

API documentation

Open the ../../docs/library_index.html#queues link in a web browser.


To load all entities in this library, load the loader.lgt file:

| ?- logtalk_load(queues(loader)).


To test this library predicates, load the tester.lgt file:

| ?- logtalk_load(queues(tester)).


To create a new queue, use the new/1 predicate:

| ?- queue::new(Queue).
Queue = ...

Elements can be added to either the end of the queue or the front of the queue using, respectively, the join/3 and join_all/3 predicates or the jump/3 and jump_all/3. For example:

| ?- queue::(new(Queue0), join_all([1,2,3], Queue0, Queue1)).
Queue0 = ...,
Queue1 = ...

We can query the head of the queue or remove the head of the queue using, respectively, the head/2 and serve/3 predicates. For example:

| ?- queue::(new(Queue0), join(1, Queue0, Queue1), head(Queue1, Head)).
Queue0 = ...,
Queue1 = ...,
Head = 1

For details on these and other provided predicates, consult the library API documentation.