C++核心准则Enum.3:枚举类要比普通的枚举类型好
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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