C++ (Qt)
#include <iostream>
#include <string>
#include "signal_slot.h"
 
void some_func(int a, float f, const std::string &str, double &x) {
    std::cout << "x = " << x << std::endl;
    std::cout << "a = " << a << " f = " << f << " str = " << str << std::endl;
    x += 123.456;
    std::cout << "x = " << x << std::endl;
}
 
class object : public ssc::trackable
{
public:
 
    void print(const std::string &text) const { std::cout << text << std::endl; }
 
    int sum(int x, int y, int z) const {
        int s = x + y + z;
        std::cout << "sum = " << s << std::endl;
        return s;
    }
 
};
 
 
int main()
{
    object obj;
 
    ssc::signal<const std::string &> sig1;
    sig1.connect(&obj, &object::print);
 
    ssc::signal<long, float, int> sig3;
    sig3.connect(&obj, &object::sum);
 
    ssc::signal<int, double, const std::string &, double&> sig4;
    sig4.connect(some_func);
 
    sig1("hello word!");
    sig3(1, 3.14, 2);
 
    double x = 0.0;
    sig4(1, 3.14, "hello word!", x);
 
    return 0;
}