Passing Timer callback function from class

Projects Programming
1

Hi guys,

I'm stuck on a bit of problem I hope someone can help me with...

I'm trying to pass callback to Timer class from another class and getting following errors:

in syntax error list:

argument of type "void (Test::)()" is incompatible with parameter of type "void ()(void *)"

in build:

Test.cpp: In member function void Test::SetTimer()

Test.cpp: 13:30: error: invalid use of non-static member function
_timer.after(1000, _callBack)
Error compiling project sources

and this is my test code:

Test.h:

#pragma once
#include "Timer.h"

class Test
{
public:
	Test();
	~Test();

	void SetTimer();

private: 
	Timer _timer;

	void _callBack();
};

Test.cpp:

#include "Test.h"

Test::Test()
{
}

Test::~Test()
{
}

void Test::SetTimer()
{
        _timer.after(1000, _callBack); // <---- PROBLEM LINE
}

void Test::_callBack()
{
	// do something here
}

How can i pass class method as callback function to Timer?

2

Is there more code that you haven't posted? Like a .ino where you create a "Test" object?

3

PaulRB:
Is there more code that you haven't posted? Like a .ino where you create a "Test" object?

Test.ino:

#include "Test.h"

Test _test;

void setup()
{
     _test.SetTimer();
}


void loop()
{

}
4

This is at the edge of my C++ knowledge. I need to improve...

Have at look at how the Timer library does it and compare that with your code.

5

It is same Timer library i was referring to, the problem is passing callback to it from class rather then from main loop function.

6

Short Answer - because of the way instance methods are implemented, you can't pass a pointer to one as you would a pointer to a regular function. If you are only going to need one instance of the Test class, then you can use a static member function. See discussion here: Using an Interrupt from a method inside a class - Programming Questions - Arduino Forum