Why is C++ enumerated class ​ better than ordinary enumerated types?

This article mainly introduces "Why C++ enumerated classes are better than ordinary enumerated types". In daily operations, I believe many people have doubts about why C++ enumerated classes are better than ordinary enumerated types. I have consulted all kinds of data and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the question "Why C++ enumerated classes are better than ordinary enumerated types". Next, please follow the editor to study!

Enum.3: enumerated classes are better than normal enumerated types

Reason (reason)

Minimize accidents: classic enumeration types are too easy to convert to integers.

Example (sample)

Void Print_color (int color)

Enum Web_color {red = 0xFF0000, green = 0x00FF00, blue = 0x0000FF}

Enum Product_info {red = 0, purple = 1, blue = 2}

Web_color webby = Web_color::blue

/ / Clearly at least one of these calls is buggy.

Print_color (webby)

Print_color (Product_info::blue)

Instead use an enum class:

When using the enumeration class:

Void Print_color (int color)

Enum class Web_color {red = 0xFF0000, green = 0x00FF00, blue = 0x0000FF}

Enum class Product_info {red = 0, purple = 1, blue = 2}

Web_color webby = Web_color::blue

Print_color (webby); / / Error: cannot convert Web_color to int.

Print_color (Product_info::red); / / Error: cannot convert Product_info to int.

Enforcement (sample)

(simple) warns all enumeration definitions other than enumerated classes.

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