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  1. #include <iostream>
  2.  
  3. struct ostream {} cout; 
  4. template<typename T> struct A{ T t; };
  5. struct B{};
  6.  
  7. namespace {
  8. template<typename T>
  9. ostream& operator<< (ostream& out, const A<T>&v) 
  10.   { return out << v.t; }
  11.  
  12. ostream& operator<< (ostream& out, const B&) 
  13.   { std::cout << "This should not compile"; return out; }
  14. }
  15.  
  16. int main(){
  17.   A<B> a;
  18.   cout << a; 
  19. }
Success #stdin #stdout 0s 3096KB
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stdin
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Standard input is empty
stdout
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This should not compile
https://ideone.com/AQkRdN
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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