如何从主类之外的嵌套类中编写实际代码 [英] How to write the actual code from a nested class outside the main class

问题描述

我想通过在主类之外编写嵌套类的实际代码来保持代码可读性。是否可能，以及如何？

I would like to keep the code readable by writing the actual code of a nested class outside the main class, Is it possible, and how ?

class AA{
   //random code

   class BB : public CC <double> {
      // very long code
   };

   // random code
};

我想写如下：

class AA{
  //random code
  //<declaration of class BB>
  // random code
};

class BB : public CC <double>{
  // very long code
};

，BB类只能在AA类中访问...

and the BB class should only be accessible within the AA class...

推荐答案

class A {
    class B;
};

class A::B {
    // ...
};

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