struct pointer function points to other function of other struct

Question

I was wondering if is possible to point a function of other structure into of a structure:

Example:

typedef struct
{
    int func(int z)
    {
        r         


        

Answer 1

The correct syntax for a pointer to method is:

&T::f

Where T is a type declaring a method f. Note that to be called, the pointer must be bound to an instance of T, because the value of the pointer represents an offset to the beginning of an instance in memory.

In C++14, you may consider std::function:

#include 

struct sta
{
    int func(int z)
    {
        return z * 2;
    }
};

struct stah
{
    std::function func;
};


int main()
{
    sta sa;
    stah sah;

    sah.func = std::bind(&sta::func, &sa, std::placeholders::_1);

    return 0;
}

You can also use lambdas instead of std::bind:

int main()
{
    sta sa;
    stah sah;

    sah.func = [&sa](int z) { return sa.func(z); };

    return 0;
}

See std::function, std::bind, and std::placeholders on cppreference.com.