std:bind

#include

#include <functional>

class Test
{
public:
    static void func(int a);
};

class Func
{
public:
    static void test(void (*funcptr)(int a),int b);
    void fs(void (*funcptr)(int a),int b);
};

void Test::func(int a) {
    printf("a = %d\n", a);
}

void Func::test(void (*funcptr)(int a),int b) {
    if(b > 0){funcptr(b);}  // a = 10  
}

void Func::fs(void (*funcptr)(int a),int b) {
    auto fn_half = std::bind(test,funcptr,std::placeholders::_1);
    fn_half(b);
}

int main(void) {
    Test c;
    Func f; 
    //auto f = c.
    f.fs(c.func,5);
    //fs(5);
    return 0;
}