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  1. #include <iostream>
  2. #include <string>
  3. using namespace std;
  4.  
  5. class Stream;
  6. class StreamTemporary
  7. {
  8. public:
  9. 	StreamTemporary(Stream& s) : _s(s) {}
  10. 	StreamTemporary& operator<<(const string& str);
  11. 	~StreamTemporary();
  12. private:
  13. 	Stream& _s;
  14. };
  15.  
  16. class Stream
  17. {
  18. public:
  19. 	StreamTemporary operator<<(const string& str)
  20. 	{
  21. 		write(str);
  22. 		return StreamTemporary(*this);
  23. 	}
  24. private:
  25. 	friend class StreamTemporary;
  26. 	// write without returning a temporary
  27. 	void write(const string& str)
  28. 	{
  29. 		cout << str;
  30. 	}
  31. };
  32.  
  33. StreamTemporary::~StreamTemporary()
  34. {
  35. 	// make sure not to call operator<< here or there will be infinite recursion
  36. 	_s.write("\n");
  37. }
  38.  
  39. StreamTemporary& StreamTemporary::operator<<(const string& str)
  40. {	
  41. 	// make sure not to call operator<< here or extra newlines will be printed
  42. 	_s.write(str);
  43. }
  44.  
  45. int main() {
  46. 	Stream myStream;
  47. 	myStream << "Hello, " << "World!";
  48. 	myStream << "a" << "b" << "c";
  49. 	myStream << "end of program";
  50. }
Success #stdin #stdout 0s 3456KB
comments (?)
stdin
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Standard input is empty
stdout
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Hello, World!
abc
end of program
https://ideone.com/D9pCEj
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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