SWI-Prolog -- spypce/1

spypce(+Behaviour)

Put a Prolog spy-point on the implementation of an XPCE behaviour. Behaviour is of the form class->send_method or class<-get_method. The predicate locates the method, determines the Prolog predicate implementing it and calls spy/1 to put a Prolog spy-point on that predicate.

Can only be used on methods defined using the Prolog class definition mechanism realised with pce_begin_class/[2,3] and pce_end_class/0. See also tracepce/1 and breakpce/1.