C ++ Enum constant

C ++ Enum constant

If you just want to use some special constants, and these constants have some relationships. For example, you want to use constants to identify the following table of the array. You can define an enum.

If Enum is defined in the class definition (the definition mentioned here refers to the class definition in the header file, rather than the class implementation in the. c file ).

What I want to say is that although we have defined an Enum type, if there is no Enum variable defined in this class.

The class size does not increase because Enum is declared in the class.

The size of the class is increased only when you declare an Enum variable in the class.

Therefore, the enum defined in the class only limits the visible range of enum.