get number of elements in the circulararray . concode_field_sep int mCapacityBitmask concode_elem_sep E[] mElements concode_elem_sep int mTail concode_elem_sep int mHead concode_field_sep void doubleCapacity concode_elem_sep void addLast concode_elem_sep E popLast concode_elem_sep void removeFromStart concode_elem_sep E getFirst concode_elem_sep E get concode_elem_sep void clear concode_elem_sep boolean isEmpty concode_elem_sep void removeFromEnd concode_elem_sep E getLast concode_elem_sep void addFirst concode_elem_sep E popFirst
int function ( ) { return ( mTail - mHead ) & mCapacityBitmask ; }