定义枚举方法（使用枚举类定义枚举类型）

定义枚举方法（使用枚举类定义枚举类型）(Simple) Warn on any non-class enum definition.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.Enforcemen

Enum.3: Prefer class enums over "plain" enums

Enum.3:枚举类要比普通的枚举类型好

Reason(原因)

To minimize surprises: traditional enums convert to int too readily.

尽量减少意外性：经典的枚举类型太容易转换为整数了。

Example(示例)

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:

而使用枚举类的时候：

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(示例)

(Simple) Warn on any non-class enum definition.

(简单)警告所有枚举类以外的枚举定义。

原文链接：

https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#enum3-prefer-class-enums-over-plain-enums

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