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  1. #include <iostream>
  2.     template <typename T>
  3.     class Key { friend T; Key() {} Key(Key const&) {} };
  4.  
  5.     class Foo;
  6.  
  7.     class Bar { public: void special(int a, Key<Foo>) {} };
  8.  
  9.     class Foo { public: void special() { Bar().special(1, {}); } };
  10.  
  11. int main() {
  12. 	Foo().special();
  13. 	Bar().special(1, {});
  14. 	return 0;
  15. }
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 'int main()':
prog.cpp:3:27: error: 'Key<T>::Key() [with T = Foo]' is private
     class Key { friend T; Key() {} Key(Key const&) {} };
                           ^
prog.cpp:13:21: error: within this context
  Bar().special(1, {});
                     ^
stdout
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Standard output is empty
https://ideone.com/7n1Wwz
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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