// Switch f2f mode to reverse.
Switch f2f mode to reverse.
// Switch f2f mode to reverse .
func (f2f *friendToFriend) Switch() {
	f2f.mutex.Lock()
	defer f2f.mutex.Unlock()
	f2f.enabled = !f2f.enabled
}
func ( f2f * friendToFriend ) Switch ( ) { f2f . mutex . Lock ( ) defer f2f . mutex . Unlock ( ) f2f . enabled = ! f2f . enabled }
Switch f2f mode to reverse.
Switch f2f mode to reverse .