在“枚举”和“枚举类”中将枚举值转换为 integer

Question

What is the difference between the Enum and Enum Class and how to converting Enum value to the integer in "Enum" and "Enum Class"?

Answer 1

C++ has two kinds of enum:

enum classes
Plain enums
Here are a couple of examples on how to declare them:

 enum class Color { red, green, blue }; // enum class
 enum Animal { dog, cat, bird, human }; // plain enum 

What is the difference between the two?

enum classes - enumerator names are local to the enum and their values do not implicitly convert to other types (like another enum or int)

Plain enums - where enumerator names are in the same scope as the enum and their values implicitly convert to integers and other types

in the Enum:

enum type{x=10,y,z=50,j};

int value = x;

in the Enum Class:

enum class type{x=10,y,z=50,j};

int value= static_cast<int>(x);