How can I pass a member function where a free function is expected?

Question

The question is the following: consider this piece of code:

#include 


class aClass
{
public:
    void aTest(int a, int b)
    {
        prin         


        

Answer 1

I asked a similar question (C++ openframeworks passing void from other classes) but the answer I found was clearer so here the explanation for future records:

it’s easier to use std::function as in:

 void draw(int grid, std::function element)

and then call as:

 grid.draw(12, std::bind(&BarrettaClass::draw, a, std::placeholders::_1));

or even easier:

  grid.draw(12, [&]{a.draw()});

where you create a lambda that calls the object capturing it by reference