enum.md

Scoped and Unscoped Enumerations

In C++, enum introduces an unscoped enumeration, and enum class or enum struct introduce a scoped enumeration.

enum class Fruit : char {
    NONE, // enumerator-list, NONE = 0
    APPLE = 'a',
    BANANA = 'b'
};
Fruit apple = Fruit::APPLE;

Scoped Enumeration (C++-only)

?inline

• underlying type is int
• requires enum-name:: to access
• only =, == and != defined (operator overloading possible)

Unscoped Enumeration

?inline

• underlying type is impl.-defined
• access without enum-name
• behaves like list of constants in surrounding scope
• inherits ops. from underlying type

See Also

<:cppreference:875716540929015908> Enumeration Declaration
<:cppreference:875716540929015908> Using-enum-declaration (since C++20)
<:cppreference:875716540929015908> std::underlying_type (since C++11)
<:cppreference:875716540929015908> std::to_underlying (since C++23)
• learncpp.com: Enumerated Types

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