When does C++ define the underlying types of enumerations

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Enum.7: define the underlying types of enumerations only when necessary

Reason (reason)

The default type is easier to read and write. Int is the default integer type. Int and C language enumerated types are compatible.

Example (sample)

Enum class Direction: char {n, s, e, w

Ne, nw, se, sw}; / / underlying type saves space

Enum class Web_color: int32_t {red = 0xFF0000

Green = 0x00FF00

Blue = 0x0000FF}; / / underlying type is redundant

Note (Note)

The underlying type of the enumeration needs to be defined when the enumeration is declared before.

Enum Flags: char

Void f (Flags)

/ /....

Enum flags: char {/ *... * /}

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