vs2013 boost signals

#include "stdafx.h"
#include <boost/signals2/signal.hpp> 
#include <iostream>       
using namespace std;

void func()
{
    std::cout << "Hello, world!" << std::endl;
}

void slots1()
{
    cout << "slots1 call" << endl;
}

void slots2()
{
    cout << "slots2 call" << endl;
}


struct Hello
{
    void operator()() const
    {
        std::cout << "Hello";
    }
};

int _tmain(int argc, _TCHAR* argv[])
{
    //
    //test boost signals
    //
    boost::signals2::signal<void()> sig;
    sig.connect(&slots1);
    sig.connect(&slots2);

    sig();

    boost::signals2::signal<void()> sig1;
    sig1.connect(Hello());
    sig1();

    return 0;
}