#include <boost/ref.hpp>
#include <boost/phoenix.hpp>

struct my_func
{
    typedef void result_type;

    void operator() (int& n) const
    {
        ++n;
    }
};

void foo(int& n)
{
    my_func f;
    boost::phoenix::bind(f, boost::phoenix::placeholders::_1)(n);
}

int main(int, char*[])
{
    int n = 0;
    foo(n);
    return n;
}