Cocos2d-x CCPointArray 移除所有元素

CCPointArray * pathPointArray=CCPointArray::create(100);
 pathPointArray->addControlPoint(ccp(touchPoint.x,touchPoint.y));
NSLog(@"=============%d",pathPointArray->count());
    while (pathPointArray->count()!=0) {
        pathPointArray->removeControlPointAtIndex(pathPointArray->count()-1);
    }
NSLog(@"--------------%d",pathPointArray->count());