从其他类访问枚举值 [英] Accessing enum values from other class

问题描述

在我的项目中，我在一个类中定义了一个枚举，该枚举在整个该类中使用。在重构期间，该枚举被移至另一个类。因此，我在原班上简单地 typedef 编辑了它，就像这样：

In my project, I have an enum defined in a class, that is used throughout that class. During refactoring, that enum was moved to another class. So I simply typedefed it in my original class, like this:

class A {
public:
  enum E {e1, e2};
};
class B {
public:
  typedef A::E E;
};

现在变量定义，返回值，函数参数等都可以正常工作。仅当我想访问第二个类中的枚举值时，我仍然必须使用周围环境类的名称来限定它们，例如

E e = A :: e1;

Now variable definitions, return values, function params, etc. work perfectly. Only when I want to access the values of the enum inside my second class, I still have to qualify them with the surroundig class's name,
e.g. E e = A::e1;

有没有办法避免这种情况，或者我是否必须复制

Is there a way to avoid this, or do I have to copy that into every occurance of the enum values?

推荐答案

您将每个枚举放入嵌套的类中，您可以在自己的类中键入def ：

You put each enumeration into a nested class that you can typedef within your own class:

class A {
public:
  struct E { enum EnumType { e1, e2 } };
};
class B {
public:
  typedef A::E E;
};

然后只是 E :: EnumType 的 E ，但您会获得完全的自动导入。

Then it's just E::EnumType instead of E but you get full auto-importation.

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