remove item from queue , if present . concode_field_sep Set<T> members concode_elem_sep Queue<T> queue concode_field_sep boolean contains concode_elem_sep boolean addIfNotPresent concode_elem_sep boolean isEmpty concode_elem_sep void clear concode_elem_sep T poll
boolean function ( T arg0 ) { this . queue . remove ( arg0 ) ; return this . members . remove ( arg0 ) ; }