How to assign callback function with parameters

Question

I need to assign a callback function with given parameters, so when the event gets triggered and the callback function is called, it calls the function with given parameters. I've looked at multiple websites and I've been trying to find a solution but no luck. Might be that I'm just so dumb, what can I do?

Here's a bit of what I'm trying to do -

void callbackFunction(int someParameter) {
 // Do something here
}

master.ButtonL1.pressed(callbackFunction(3));
// The code above doesn't work, just there to show what I'm wanting to do

songyuanyao · Accepted Answer · 2019-06-09 03:46:43Z

3

You can use lambda.

master.ButtonL1.pressed([]{callbackFunction(3);});

answered Jun 9, 2019 at 3:46

songyuanyao

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R Sahu · Accepted Answer · 2019-06-09 03:52:00Z

2

In addtion to using a lambda expression, as suggested in the answer by songyuanyao, you can use the following method.

void realCallbackFunction(int someParameter)
{
  // DO the real work
}

static int parameter = 0;
void callbackFunction()
{
   realCallbackFunction(paramter);
}

...

paramter = 3;
master.ButtonL1.pressed(callbackFunction);

answered Jun 9, 2019 at 3:52

R Sahu

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2 Comments

Latte Over a year ago

Thanks for the answer. This was originally what I was going to do, but I have to do this to multiple buttons. I feel like this would make the code very bulky.

R Sahu Over a year ago

@Latte, if your compiler supports lambda functions, that's the way to go. I am saying that because I am still using VS 2008 at work :)

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