Fun with Sprites – Sky Defense - Cocos2d-x by Example Beginner's Guide - page 121

//action to rotate sprites
auto rotate = RotateBy::create(0.5f , -90);
_rotateSprite = RepeatForever::create( rotate );
_rotateSprite->retain();
3. First, another Sequence . This will fade out the sprite and call the shock-
waveDone function, which is already implemented in the class and turns the
_shockwave sprite invisible when called.
4. The last one is a RepeatForever action of a RotateBy action. In half a
second, the sprite running this action will rotate -90 degrees and will do that
again and again.