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  1. #include <iostream>
  2. class Base {
  3.  protected:
  4.  static int x;
  5. };
  6. int Base::x;
  7.  
  8. class DerivedA: public Base {
  9.  public:
  10.      DerivedA() {
  11.         x = 9;
  12.      }
  13. };    
  14. class DerivedB: public Base {
  15.  public:
  16.      DerivedB() {
  17.         std::cout << DerivedA::x;
  18.      }
  19. };
  20. int main() {
  21.         DerivedB b;
  22. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp: In constructor 'DerivedB::DerivedB()':
prog.cpp:6:5: error: 'int Base::x' is protected
 int Base::x;
     ^
prog.cpp:17:32: error: within this context
         std::cout << DerivedA::x;
                                ^
stdout
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Standard output is empty
https://ideone.com/TM7qW4
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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