Method turnBack

czxing/src/main/cpp/zxing/src/BitMatrixCursor.h:78–78

	POINT direction(Direction dir) const noexcept { return static_cast<int>(dir) * right(); }

	void turnBack() noexcept { d = back(); }
	void turnLeft() noexcept { d = left(); }
	void turnRight() noexcept { d = right(); }
	void turn(Direction dir) noexcept { d = direction(dir); }