description

# clear method

void clear()
override

Removes all elements in the queue. The size of the queue becomes zero.

## Implementation

    void clear() {
      var cursor = _sentinel._nextLink!;
      while (true) {
        var entry = cursor._asNonSentinelEntry();
        if (entry == null) break;
        cursor = cursor._nextLink!;
        entry
          .._nextLink = null
          .._previousLink = null
          .._queue = null;
      }
      _sentinel._nextLink = _sentinel;
      _sentinel._previousLink = _sentinel;
      _elementCount = 0;
    }