Function pointer to class member function

Question

I want to make function which has function pointer as a parameter.

#include 
using namespace std;

class test{

public:
    test(){};

    do         


        

Answer 1

Here is a code after modification.

#include 
using namespace std;

class test{

public:
    test(){};

    double tt(double input){
        return input;
    };

};

double fptr_test(test* t, double (test::*fptr)(double), double input){
    return (t->*fptr)(input);
}

int main(){

    test t;
    cout << t.tt(3) << endl;
    cout << fptr_test(&t, &test::tt, 3) << endl;

    return 1;
}