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  1. #include <boost/noncopyable.hpp>
  2.  
  3. class Key
  4. {
  5.   friend class Copain;
  6.   Key() {}
  7.   Key(Key const&) {}
  8. };
  9.  
  10. void semiprivate(Key) {}
  11.  
  12. struct Copain
  13. {
  14.   Key key;
  15.  
  16.   void test()
  17.   {
  18.     semiprivate(key);
  19.   }
  20. };
  21.  
  22. void other() {
  23.     Copain c;
  24.     semiprivate(c.key);
  25. }
  26.  
  27.  
  28. int main()
  29. {
  30. }
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 function ‘void other()’:
prog.cpp:7: error: ‘Key::Key(const Key&)’ is private
prog.cpp:24: error: within this context
prog.cpp:24: error:   initializing argument 1 of ‘void semiprivate(Key)’
stdout
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Standard output is empty
https://ideone.com/GOb1w
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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