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  1. #include <iostream>
  2.  
  3. struct Base; struct Derived; // First case: Base is protected.
  4. struct B; struct D;          // Second case: Function is protected.
  5.  
  6. // -----
  7.  
  8. // Base is protected.
  9. struct Base {
  10.     void func() { std::cout << "Hi.\n"; }
  11. };
  12.  
  13. struct Derived : protected Base {
  14.     void heya() { std::cout << "Direct call says: "; return func(); }
  15.  
  16.     void ahey() {
  17.         static Derived* ptr = this;
  18.         std::cout << "Through static pointer says: ";
  19.         return ptr->func();
  20.     }
  21. };
  22.  
  23. // -----
  24.  
  25. // Function is protected.
  26. struct B {
  27.   protected:
  28.     void func() { std::cout << ".iH\n"; }
  29. };
  30.  
  31. struct D : public B {
  32.     void heya() { std::cout << "Direct call says: "; return func(); }
  33.  
  34.     void ahey() {
  35.         static D* ptr = this;
  36.         std::cout << "Through static pointer says: ";
  37.         return ptr->func();
  38.     }
  39. };
  40.  
  41. // -----
  42.  
  43. int main() {
  44.     // Base is protected.
  45.     Derived der;
  46.  
  47.     der.heya();
  48.     der.ahey();
  49.  
  50.     // -----
  51.  
  52.     // Function is protected.
  53.     D d;
  54.  
  55.     d.heya();
  56.     d.ahey();
  57.  
  58.     // -----
  59.  
  60.     // Through a different instance?
  61.     Derived{}.ahey();
  62.     D{}.ahey();
  63. }
Success #stdin #stdout 0s 5320KB
comments (?)
stdin
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Standard input is empty
stdout
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Direct call says: Hi.
Through static pointer says: Hi.
Direct call says: .iH
Through static pointer says: .iH
Through static pointer says: Hi.
Through static pointer says: .iH
https://ideone.com/CnqDnX
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
secret

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