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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. //Forward declarations
  6. template< typename T >
  7. class Container;
  8. template< typename T, typename charT, typename traits >
  9. basic_ostream< charT, traits >& 
  10.     operator<<( basic_ostream< charT, traits >& out, 
  11.                 const Container< T >& a_container ); 
  12.  
  13. //Definitions
  14. template< typename T >
  15. class Container
  16. {
  17. public:
  18. 	Container( T a_value ):	value( a_value ){}
  19.  
  20. private:
  21. 	T value;
  22.  
  23. 	template< typename S, typename charT, typename traits >
  24. 	friend basic_ostream< charT, traits >& 
  25. 	    operator<<( basic_ostream< charT, traits >& out, 
  26. 	                const Container< S >& a_container );
  27. };
  28.  
  29. template< typename T, typename charT, typename traits >
  30. basic_ostream< charT, traits >& 
  31.     operator<<( basic_ostream< charT, traits >& out, 
  32.                 const Container< T >& a_container )
  33. {
  34. 	out << a_container.value;
  35. 	return out;
  36. }
  37.  
  38. //Main
  39. int main( void )
  40. {
  41. 	Container< int > my_container( 42 );
  42.  
  43. 	cout << my_container;
  44.  
  45. 	return 0;
  46. }
Success #stdin #stdout 0s 3296KB
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stdin
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Standard input is empty
stdout
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42
https://ideone.com/DNQzlB
Works, but too general
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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