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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. template< typename T >
  5. class Container;
  6.  
  7. template< typename T >
  8. ostream& operator<<( ostream& out, const Container< T >& a_container );
  9.  
  10. template< typename T >
  11. class Container
  12. {
  13. 	public:
  14. 	Container( T value );
  15.  
  16. 	private:
  17. 	T value;
  18.  
  19. 	friend ostream& operator<< <>( ostream& out, const Container< T >& a_container );
  20. };
  21.  
  22. template< typename T >
  23. Container< T >::Container( T a_value ): value( a_value )
  24. {
  25. }
  26.  
  27. template< typename T >
  28. ostream& operator<<( ostream& out, const Container< T >& a_container )
  29. {
  30. 	out << a_container.value;
  31. 	return out;
  32. }
  33.  
  34. int main() 
  35. {
  36. 	Container< int > a_container( 42 );
  37.  
  38. 	cout << a_container;
  39.  
  40. 	return 0;
  41. }
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/fBhInb
Works, but for ostream
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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