Multiple Definitions Error VScode

[Alexander_Ault]

I am having some trouble getting my code to compile. I am just learning how to code in c++ and I’m trying the Button.pressed function to start and stop my catapult. I have figured out that it needs a callback function so I took this to mean I have to declare elsewhere a function that would contain instructions for my catapult. So, I declared a void function in robot-config.h named Cata. In my user control loop, I simply put the Button.pressed function with Cata as the callback. When I try to compile my code, the terminal tells me I have multiple declarations of Cata.

Here is my function

and here is where I call it

I want to know if this is a problem with how I setup my function, where it is declared, or how I calling it. Thanks.

[Nan]

I think you should look around in your code and see if there not a motor or any variable expect the function named “Cata” that should probably be the problem

[Alexander_Ault]

No, I have tried changing the function name, it originally was Catapult_Movement, then I tried Catapult_Pos, and then I tried something random like fleeing, but they all return the same error.

[Nan]

Also why are you declaring your function inside the robot configuration file? If its not important anywhere else you should delete that and just keep the function in your main.cpp

[EcstaticPilot]

first, do not declare events inside of a while loop as this will cause the event to be registered multiple times leading to unexpected behavior. This is most likely a problem with how the function is declared and incorrect usage of function prototypes and/or header files. Here’s an example from the learncpp.com on header files

add.cpp:

int add(int x, int y)
{
    return x + y;
}

main.cpp:

#include <iostream>

int add(int x, int y); // forward declaration using function prototype

int main()
{
    std::cout << "The sum of 3 and 4 is " << add(3, 4) << '\n';
    return 0;
}