function pointer question (callback function)

Using Arduino Programming Questions
#1

So, building a Class, I have the constructor:

StateTimer(void (*pCallbackFunction)(StateTimer*));

and the function prototype (a private member function):

void(*pCallback)(StateTimer*);

I want to pass an argument to the callback, pseudo code like this:

#include "StateTimer.h"
StateTimer myTimer(&myFunction);
void setup()
{

}
void loop()
{
  myTimer.process();
}
void myFunction(StateTimer* stateTimer, int state) // <<<< sort of like this
{
  if(state==0)
    do something;
  else if (state==1)
    do something else;
  etc...
}

and something like the StateTimer::process() function like this:

void StateTimer::process()
{
  if(this->timerON())
  {
    pCallback(this, 1);  //<<<<<< pass the argument (sort of like this) here...
  }

  else if(this->timerOFF())
  {
    pCallback(this, 0);
  }
}

Can anyone offer up suggestions to accomplish what I’m trying to do here?

#2

Can anyone offer up suggestions to accomplish what I'm trying to do here?

Look at your constructor:

StateTimer(void (*pCallbackFunction)(StateTimer*));

It says that the function takes one argument, a StateTimer pointer, and returns nothing.

If you want the function to take more than one argument, change your constructor.

#3

thanks Paul...

StateTimer(void (*pCallbackFunction)(StateTimer*, int myInt));

void(*pCallback)(StateTimer*, int myInt);

etcetera...

got it!

I really appreciate your help with this... I'm operating slightly above my pay grade on these callbacks... trying to build my understanding.

#4

I'm operating slightly above my pay grade on these callbacks... trying to build my understanding.

Been there, done that, got the t-shirt.

#5