namespace {
    std::map<std::string, void(*)(complex_stack &)> op = {
        { "+", [](complex_stack &st) {
            complex x, y;
            extract(st, x, y);
            st = st << (x + y);
        }},
        { "-", [](complex_stack &st) {
            complex x, y;
            extract(st, x, y);
            st = st << (y - x);
        }},
        { "*", [](complex_stack &st) {
            complex x, y;
            extract(st, x, y);
            st = st << (x * y);
        }},
        { "/", [](complex_stack &st) {
            complex x, y;
            extract(st, x, y);
            st = st << (y / x);
        }},
        { "!", [](complex_stack &st) {
            complex x = +st;
            st = st << x;
        }},
        { ";", [](complex_stack &st) {
            st = ~st;
        }},
        { "~", [](complex_stack &st) {
            complex x;
            extract(st, x);
            st = st << (~x);
        }},
        { "#", [](complex_stack &st) {
            complex x;
            extract(st, x);
            st = st << (-x);
        }}
    };
};