Logtalk reference manual
Built-in predicate: define_events/5

define_events/5

Description

define_events(Event, Object, Message, Sender, Monitor)

Defines a new set of events. The two types of events are represented by the atoms before and after The object Monitor must define the event handler methods required by the Event argument.

Template and modes

define_events(@term, @term, @term, @term, +object_identifier)

Errors

Event is neither a variable nor a valid event identifier:
type_error(event, Event)
Object is neither a variable nor a valid object identifier:
type_error(object_identifier, Object)
Message is neither a variable nor a callable term:
type_error(callable, Message)
Sender is neither a variable nor a valid object identifier:
type_error(object_identifier, Sender)
Monitor is a variable:
instantiation_error
Monitor is neither a variable nor a valid object identifier:
existence_error(object_identifier, Monitor)
Monitor does not define the required before/3 method:
existence_error(procedure, before/3)
Monitor does not define the required after/3 method:
existence_error(procedure, after/3)

Examples

| ?- define_events(_, list, member(_, _), _ , debugger).

See also

abolish_events/5, current_event/5
before/3, after/3