Differences between enum and enum class and typedef enum

Question

Hi, I would like to know the differences between declaring an enum variable using these 3 types of declaration: enum, enum class, typedef enum.

Answer 1

typedef enum is for C, in C++ we don't do it.

enum {} is the same thing as having many global variables.

GAMEOVER

enum class className {} means they will be local to their className scope. For example

className::GAMEOVER

Even you can declare enum by their data type

enum: unsigned long long {}

enum class cn: uint_16 {}

Answer 2

I read that members of unscoped enumerators (enum Enum_{}) cannot be obtained with scope resolution operator (::), but I found that this is not the case. Why?