Is there a way to add code on a function from another Class without inheritance?-CodePudding

Let's say we have a class that has a function foo() that counts to 3 and we want from another class to be able to modify this function and after modifying it counts to 3 that was previously declared but also executes the new code too. The function foo() would only be called by class1 and i dont want to use inheritance. The new code that im supposed to add lets say it doesnt have any relationship with class1.

For Example:

#include <iostream>
using namespace std;


class class1 {
public:
    class1()
    {
        
    }
    void foo()
    {
        for(int i =0;i<2;i  )
        {cout << i << endl;}
    }
};

class class2 {
public:
    class2()
    {
       
    }
    void foo() override
    {
       Super::foo();
       cout << "Jump from a cliff" << endl;
    }

};

int main()
{   
    class1 c1 = class1();
    class2 c2 = class2();
    c1.foo();
    return 0;
}

Result:

0
1
2
Jump From a cliff

CodePudding user response：

You need an object to call a non-static member function.

If you want to get desired output from class2::foo you can implement it for example like this:

class class2 {
public:
    void foo() 
    {
       class1 x;
       x.foo();
       cout << "Jump from a cliff" << endl;
    }

};

Alternatively class1 can have a member of type class1.

CodePudding user response：

Found the solution on Array of function pointers.