我们真的需要“枚举类”在C ++ 11？ [英] Do we really need "enum class" in C++11?

问题描述

当我们有，

  struct E {enum E_ {HELLO}; }; //'E'is inheritable 
  

那么我们为什么需要，

 枚举类E {HELLO}; //'E'不可继承
  

IMO第2版不提供比第1版更多的功能。我不认为枚举类只是为了保存2个大括号 {}; ！我缺少任何重要的方面？

作为一个小问题，枚举类和<$除了语法（因为都有 public 访问说明符）？

枚举类枚举不会隐式转换为整数。

When we have,

struct E { enum E_ { HELLO }; }; // 'E' is inheritable

then why do we need,

enum class E { HELLO };  // 'E' is not inheritable

IMO 2nd version doesn't offer more features than the 1st. I don't think that enum class is introduced just to save 2 curly braces {};! Am I missing any important aspect ?

As a minor question, is there any difference between enum class and enum struct other than syntax (because both have public access specifier) ?

解决方案

Besides what was already mentioned, an advantage of enum class is better type safety - the enum class enumerators don't convert implicitly to integers.

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