boolean function ( ) { return depth ( ) == 0 ; }
returns true if the queue is empty , otherwise false concode_field_sep AtomicReference<T>[] m_aCircularArray concode_elem_sep int m_nMaxSize concode_elem_sep AtomicLong m_aCurrentIndex concode_field_sep int depth concode_elem_sep int _getIndex concode_elem_sep T[] toArray concode_elem_sep int _getCurrentIndex concode_elem_sep void push concode_elem_sep T peek