In C++, coding for Arduino, how can I save a function to a variable and call it later via the variable?

Question

I want to save a function I've made to a string variable and call it later via the variable - something like this:

String hello = "helloWorld();";

void loop()
{
    hello;
}

void helloWorld()
{
    //does functional things...
}

This is a super basic idea of what I want to make happen. I'm making a game and want a certain function (different every time) to be stored in a variable to be played back later.

Answer 1

To declare a function pointer, you need to know its signature.

If your function helloWorld does not take parameters and returns nothing (void ), a variable to store that could be defined as

void (*myFunc)() = helloWorld;

void loop()
{
   myFunc();
}

The only Arduino specific is that usually the required function declaration is done for you secretly behind the scenes.