#include <boost/signals2.hpp>

using namespace boost;

struct Slot
{
    void operator()()
    {
    }
};

int main(void) {
    boost::signals2::signal<void(void)> sig;
    Slot slot;

    boost::signals2::connection conn1, conn2, conn3, conn4;

    while (true) {
        conn1.disconnect();
        conn2.disconnect();

        conn1 = sig.connect(slot);
        conn2 = sig.connect(slot);

        conn3.disconnect();
        conn4.disconnect();

        conn3 = sig.connect(slot);
        conn4 = sig.connect(slot);

        //sig();
    }

    return EXIT_SUCCESS;
}