Thread: How do I pass an instantiated object and it's member function to another function?

Hi all. I have been stuck on this idea for days now. From my understanding, to call a member function by pointer, I will need two things: A pointer to the class and a pointer to the function. With that said, my two files are exeFunc.h and exeFunc.cpp Their code consist of:

exeFunc.h

Code:

/*
File: exeFunc.h


Header file for exeFunc Library.
*/


#ifndef EXEFUNC_H
#define EXEFUNC_H


#include "mbed.h"
#include "msExtensions.h"
#include "cfExtensions.h"
#include "GenericFunctionHandler.h"
#include <map>
#include <utility>


class exeFunc
{


public:
    exeFunc(msExtensions &msExt, cfExtensions &cfExt);


    void _exeCallback();




private:
    void _splitFuncFromCmd();
    void _attachCallback();


    msExtensions &_msExt;
    cfExtensions &_cfExt;


};



#endif

exeFunc.cpp

Code:

/*
File: exeFunc.cpp


Execute functions in other Sensor libraries/classes


Constructor
*/


#include "mbed.h"
#include "ConfigFile.h"
#include "msExtensions.h"
#include "cfExtensions.h"
#include "exeFunc.h"


#include <map>
#include <string>


using namespace std;


exeFunc::exeFunc(msExtensions &msExt, cfExtensions &cfExt) : 
    _msExt(msExt), _cfExt(cfExt)
{


}


void exeFunc::_splitFuncFromCmd()
{


}


void exeFunc::_exeCallback()
{
    
    
}

I already have my instantiated objects _msExt(msExt) and _cfExt(cfExt). I would like to use void exeFunc::_exeCallback() function as the function to finally execute the function from the object and the member function that were typed into the arguments of exeCallback(). For example, if I type _exeCallback(&_cfExt, &cfExtensions::checkConfigForFirstStart) that should execute the member function. That is the part that I am having a hard time with. What should I do to achieve this without using bind?

Maybe using a member function templates could help you, for instance:

Code:

#include <iostream>
using namespace std;

struct exeFunc{

    template<class T, class F>
    void exeCallback(T* t, F f){
        (t->*(f))();
    }

};


struct cfExtensions{
    void f(){
        cout << "cfExtensions::f()\n";
    }

    void g(){
        cout << "cfExtensions::g()\n";
    }
};

struct msExtensions{
    void f(){
        cout << "msExtensions::f()\n";
    }

    void g(){
        cout << "msExtensions::g()\n";
    }

    void h(){
        cout << "msExtensions::h()\n";
    }
};

int main(){
    cfExtensions cfe;
    msExtensions mse;

    exeFunc ef;
    ef.exeCallback(&cfe, &cfExtensions::f);
    ef.exeCallback(&cfe, &cfExtensions::g);
    ef.exeCallback(&mse, &msExtensions::f);
    ef.exeCallback(&mse, &msExtensions::g);
    ef.exeCallback(&mse, &msExtensions::h);

    return 0;
}