func (w *Watcher) Size() int {
	w.Lock()
	defer w.Unlock()
	return len(w.depViewMap)
}
func (w *Watcher) Size() int {
	w.Lock()
	defer w.Unlock()
	return len(w.depViewMap)
}
func ( w * Watcher ) Size ( ) int { w . Lock ( ) defer w . Unlock ( ) return len ( w . depViewMap ) }
// Size returns the number of views this watcher is watching.
Size returns the number of views this watcher is watching .