C++核心准则Enum.7: 只在必要时定义枚举的底层类型
Enum.7: Specify the underlying type of an enumeration only when necessary
Enum.7: 只在必要时定义枚举的底层类型
Reason(原因)
The default is the easiest to read and write. int is the default integer type. int is compatible with C enums.
默认的类型更容易读写。int是默认的整数类型。int和C语言枚举类型兼容。
Example(示例)
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(注意)
Specifying the underlying type is necessary in forward declarations of enumerations:
在前置声明枚举时需要定义枚举的底层类型。
enum Flags : char;
void f(Flags);
// ....
enum flags : char { /* ... */ };
Enforcement(实施建议)
????
原文链接:
https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#enum7-specify-the-underlying-type-of-an-enumeration-only-when-necessary
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