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  1. class base
  2. {
  3. protected:
  4.    int x;
  5. };
  6.  
  7. class der: public base
  8. {
  9.    void Acc(base& b)
  10.    {
  11.       b.x = 5;  // error
  12.       b.*(&der::x) = 5;  // ok
  13.    }
  14. };
  15.  
  16. int main () {}
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 member function ‘void der::Acc(base&)’:
prog.cpp:4:8: error: ‘int base::x’ is protected
    int x;
        ^
prog.cpp:11:9: error: within this context
       b.x = 5;  // error
         ^
stdout
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Standard output is empty
https://ideone.com/gLxRad
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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