Justification

This is considered bad practice and can also result in unexpected behavior.

Example

enum Animal { CAT, DOG, PIG, HORSE };
enum Color  { BLACK, RED, YELLOW };

Animal eAnimal = RED; /* WRONG */

Note

The C++ language already contains enumerated types as distinct types. Consequently, trying to assign enumerators from one enum type to another enum type will cause a C++ compiler error.