queue.go
func (q *Queue) Peek() (interface{}, bool) {
	q.key.RLock()
	defer q.key.RUnlock()
	if q.underlyer == nil {
		return nil, false
	}
	return q.underlyer.PeekFront()
}
func (q *Queue) Peek() (interface{}, bool) {
	q.key.RLock()
	defer q.key.RUnlock()
	if q.underlyer == nil {
		return nil, false
	}
	return q.underlyer.PeekFront()
}
func ( q * Queue ) Peek ( ) ( interface { } , bool ) { q . key . RLock ( ) defer q . key . RUnlock ( ) if q . underlyer == nil { return nil , false } return q . underlyer . PeekFront ( ) }
// Peek returns the next item in the Queue without removing it.
Peek returns the next item in the Queue without removing it .