SWI-Prolog -- prolog_unlisten/2

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Predicate prolog_unlisten/2

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Availability:built-in

prolog_unlisten(+Channel, :Closure)

Remove matching closures registered with prolog_listen/3.

History

Introduced in 8.1.9 (👉c3d497e) prolog_listen/2,3 and prolog_unlisten/2 to register hooks into the Prolog engine that allow trapping certain events. This replaces and generalises the undocumented prolog_event_hook/1 hook used by the debugger.