Add example of propagating a structure

examples/eventbus/eventbus.v

@@ -12,17 +12,22 @@ fn main() {
 	r := Receiver{}
 	sub.subscribe_method('event_foo', on_foo, r)
 	sub.subscribe('event_bar', on_bar)
+	sub.subscribe('event_baz', on_baz)
 	
 	println("Receiver ok: "+r.ok.str())
 	some_module.do_work()
 	println("Receiver ok: "+r.ok.str())
 }
 
-fn on_foo(mut receiver &Receiver, e &some_module.Event, sender voidptr) {
+fn on_foo(mut receiver &Receiver, e &some_module.EventMetadata, sender voidptr) {
 	receiver.ok = true
 	println('on_foo :: ' +e.message)
 }
 
-fn on_bar(receiver voidptr, e &some_module.Event, sender voidptr) {
+fn on_bar(receiver voidptr, e &some_module.EventMetadata, sender voidptr) {
 	println('on_bar :: ' +e.message)
 }
+
+fn on_baz(receiver voidptr, event voidptr, d &some_module.Duration) {
+	println('on_baz :: ' + d.hours.str())
+}

examples/eventbus/modules/some_module/some_module.v

@@ -6,27 +6,27 @@ const (
 	eb = eventbus.new()
 )
 
-pub struct Work {
+pub struct Duration {
 pub:
 	hours int
 }
 
-pub struct Event {
+pub struct EventMetadata {
 pub:
 	message string
 }
 
 pub fn do_work() {
-	work := Work{10}
+	duration := Duration{10}
 	for i in 0 .. 10 {
 		println('working...')
 		if i == 5 {
-			error := &Event{'Iteration '+i.str()}
-			some_module.eb.publish('event_foo', work, error)
-			some_module.eb.publish('event_bar', work, error)
+			event_metadata := &EventMetadata{'Iteration '+i.str()}
+			some_module.eb.publish('event_foo', duration, event_metadata)
+			some_module.eb.publish('event_bar', duration, event_metadata)
 		}
 	}
-	some_module.eb.publish('event_bar', &Work{42}, &Event{'Additional data at the end.'})
+	some_module.eb.publish('event_baz', &Duration{42}, &EventMetadata{'Additional data at the end.'})
 }
 
 pub fn get_subscriber() eventbus.Subscriber {