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  1. #include <set>
  2. #include <iostream>
  3. class Foo{
  4.  public:
  5.   class Inner{
  6.   public:
  7.     Inner(Foo *foo){
  8.         outer = foo;
  9.         foo->addRef(this);
  10.     }
  11.     Foo *outer;
  12.     void outerDeleted(){
  13.         outer = nullptr;
  14.     }
  15.   };
  16.   std::set<Inner*> inners;
  17.   void addRef(Inner *inner){
  18.       inners.insert(inner);
  19.   }
  20.   ~Foo(){
  21.       for(auto in : inners){
  22.         in->outerDeleted();
  23.       }      
  24.   }
  25.  
  26.  
  27. };
  28.  
  29. int main(){
  30.     Foo *f = new Foo();
  31.     Foo::Inner *i = new Foo::Inner(f);
  32.     std::cout << f << std::endl;
  33.     std::cout << i->outer << std::endl;
  34.     delete f;
  35.     std::cout << i->outer << std::endl;
  36. }
Success #stdin #stdout 0s 3028KB
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https://ideone.com/L9XqI5
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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