Create a enum class and enumerate inmutable objects of that class using C++

Question

Im trying to create a Timezone enum in C++ and I enumerate the values this way:

Timezone englandTZ(TimeChangeRule{"SDT", Last, Sun, Mar, 4, 0},TimeChangeRule{"SST", Last, Sun, Sept, 7, 60});

enum TIMEZONE {
    ENGLAND = englandTZ
};

But when compiling it raises the error

error: the value of 'englandTZ' is not usable in a constant expression

Timezone and TimeChangeRule are classes. I think the error is because the object EnglandTZ is not a constant expression? How could I create a enum class and enumerate the inmutable objects of that class like in Java but using C++?