SWI-Prolog -- tracepce/1

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Predicate tracepce/1

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Source

tracepce(+Behaviour)

Trace the indicated behaviour object. Puts a trace-point on the behaviour so the system prints entries and completion of that behaviour. Behaviour is specified as class->selector or class<-selector. Example:

?- tracepce(box->event).
Trace method: graphical ->event

See also spypce/1 and breakpce/1.