#include <boost/signals2.hpp>
#include <boost/phoenix/core.hpp>
#include <boost/phoenix/bind.hpp>
#include <boost/phoenix/operator.hpp>
#include <iostream>

using boost::phoenix::bind;
using boost::phoenix::arg_names::arg1;

typedef boost::signals2::signal< bool (int& param)> signal_type;

bool foo(int& p)
{
        p *= 2;
        return true;
}

int main()
{
        signal_type sig;

        //sig.connect(foo);
        sig.connect(bind(foo,arg1));

        int a = 5;
        std::cout << sig(a) << " " << a << std::endl;

        return 0;
}