Help Setting Spark Max Follower

[MorpheusComplex]

I am having issues setting a Spark Max to follow another Spark Max.

CANSparkMax.h is included in the .h file

'class std::shared_ptr<rev::CANSparkMax>' has no member named 'Follow'
     leftFollow.Follow(leftLead)

Excerpt from code:

  void Drive::Periodic() {
        Put code here to be run every loop
    
    leftFollow.Follow(leftLead);
    rightFollow.Follow(rightLead);
   

    // put elevator positions on smartdash   
}

[zucker42]

You are using a pointer, so you have to use the arrow operator to dereference the pointer and call the function, and the pointer dereference operator to dereference the argument.

leftFollow->Follow(*leftLead);

You can also manually dereference and call the function, which does exactly the same thing, but as one of my professors said, makes you look “like a novice”. You need parentheses because of operator precedence.

(*leftFollow).Follow(*leftLead);

The reason you get that error message is you are trying to call Follow on a shared_pointer, and the shared_pointer doesn’t have a Follow method.

I found a stack overflow question that may help you understand pointers in C++ better. It goes into quite a bit of detail that’s not really necessary here, but is good to know.

Good luck.

[MorpheusComplex]

Thank you this helped get me going, I am by no means a Cpp pro. Working on it