Enum.3: Prefer class enums over "plain" enums
Enum.3:枚舉類要比普通的枚舉類型好
Reason(原因)
To minimize surprises: traditional enums convert to int too readily.
儘量減少意外性：經典的枚舉類型太容易轉換為整數了。
Example(示例)
<code>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);/<code>
Instead use an enum class:
而使用枚舉類的時候：
<code>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./<code>
Enforcement(示例)
(Simple) Warn on any non-class enum definition.
(簡單)警告所有枚舉類以外的枚舉定義。
原文鏈接：
https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#enum3-prefer-class-enums-over-plain-enums
覺得本文有幫助？請分享給更多人。
面向對象開發，面向對象思考！
分享到:
閱讀更多 面向對象思考 的文章
