#include <iostream>

template <size_t period>
class PeriodicAvgTimer {
public:
    volatile static int registrator;
    static int register_for_updates() {
        std::cerr << "register" << std::endl;
        return 42;
    }
    static void do_some_stuff() {
        std::cerr << "Some stuff" << std::endl;
    }
};

template class PeriodicAvgTimer<60>;

template<size_t period>
volatile int  PeriodicAvgTimer<period>::registrator = PeriodicAvgTimer<period>::register_for_updates();

int main() {
    PeriodicAvgTimer<70>::do_some_stuff();
    PeriodicAvgTimer<30>::do_some_stuff();
}