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  1.     #include <iostream>
  2.     using namespace std;
  3.  
  4.     class Outer {
  5.     public:
  6.     class Inner {
  7.     public:
  8.     void mutateOuter(Outer& o);
  9.     };
  10.  
  11.     private:
  12.     int value;
  13.     };
  14.  
  15.     void Outer::Inner::mutateOuter(Outer& o) {
  16.     o.value ++; // Legal? Or not?
  17.     }
  18.  
  19.     int main() {
  20.     Outer zz;
  21.     Outer::Inner ww;
  22.     ww.mutateOuter(zz);
  23.     return 0;
  24.     }
Success #stdin #stdout 0s 3292KB
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https://ideone.com/uSfXnZ
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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