What is the difference between the Enum and Enum Class and how to converting Enum value to the integer in "Enum" and "Enum Class"?
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1Does this answer your question? Getting the integer value from enumRolandas Ulevicius– Rolandas Ulevicius2021-01-11 11:25:32 +00:00Commented Jan 11, 2021 at 11:25
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1@RolandasUlevicius No, that question is about C# enums.Yksisarvinen– Yksisarvinen2021-01-11 11:29:20 +00:00Commented Jan 11, 2021 at 11:29
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1No, my question is about difference between enum value and enum class value in c++.Mohammad reza Kashi– Mohammad reza Kashi2021-01-11 11:29:27 +00:00Commented Jan 11, 2021 at 11:29
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2 Answers
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>(type::x);
2 Comments
super
The second example should be
int value= static_cast<int>(type::x);
starriet 차주녕
Note that the underlying type defaults to
int in 'scoped enumerations', unless otherwise specified explicitly such as enum class myEnum: int64_t {...}. See the ref.As of C++23 there's a library function, std::to_underlying, for converting enum class values to their underlying value.
int main ()
{
enum class Foo {a, b, c, d, e, f};
return std::to_underlying(Foo::f); // returns 5
}
