std::function<> tests

#include <functional>
#include <iostream>

void f(int a, int b);
void g(int a, int b, float c, float d);

typedef std::function<void (int, int)> TestCallback;

int main() {
    TestCallback callback1 = std::bind(&f, std::placeholders::_1, std::placeholders::_2);
    callback1(1, 2);
    
    TestCallback callback2 = std::bind(&g, std::placeholders::_1, std::placeholders::_2, 12.2f, 12.5f);
    callback2(1, 2);
    
    return 0;
}

void f(int a, int b) {
    std::cout << a << " " << b << std::endl;
}


void g(int a, int b, float c, float d) {
    std::cout << a << " " << b << " " << c << " " << d << std::endl;
}