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  1. #include <iostream>
  2.  
  3. class First;
  4.  
  5. // Typedefs make this much more readable: http://w...content-available-to-author-only...t.com/c++-faq-lite/pointers-to-members.html#faq-33.5
  6. typedef void (First::*SecondTriggeredCallback)(void);
  7.  
  8. // And macros make the call much more readable:  http://w...content-available-to-author-only...t.com/c++-faq-lite/pointers-to-members.html#faq-33.6
  9. #define CALL_MEMBER_FN(object,ptrToMember) ((object).*(ptrToMember))
  10.  
  11. class Second
  12. {
  13. public:
  14.     // You'll also need an *instance* of the First class
  15.     Second(SecondTriggeredCallback SecondTriggered, First& first)
  16.     {
  17.         CALL_MEMBER_FN(first, SecondTriggered)();
  18.     }
  19. };
  20.  
  21. class First
  22. {
  23. private:
  24.     Second *second;
  25.  
  26. public:
  27.     First()
  28.     {
  29.         std::cout << "first class was created" << std::endl;
  30.         second = new Second(&First::SecondTriggered, *this);
  31.     }
  32.  
  33.     ~First()
  34.     {
  35.         delete second;
  36.     }
  37.  
  38.     void SecondTriggered()
  39.     {
  40.         std::cout << "second class was created and responded" << std::endl;
  41.     }
  42. };
  43.  
  44. int main()
  45. {
  46.     First first;
  47. }
  48.  
Success #stdin #stdout 0.02s 2856KB
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Standard input is empty
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first class was created
second class was created and responded
https://ideone.com/7USO1
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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