// Pop an incomplete item from the pipe. Returns true is such
// item exists, false otherwise.
public T unwrite() {
if (f == queue.back_pos()) return null;
queue.unpush();
return queue.back();
}
// Pop an incomplete item from the pipe. Returns true is such
// item exists, false otherwise.
public T unwrite() {
if (f == queue.back_pos()) return null;
queue.unpush();
return queue.back();
}
