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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. template <typename T> class A {
  5. 	string a;
  6. 	static T t;
  7. public:	
  8. 	A(): a("void\n"){};
  9. 	operator T() { a = "T\n"; return T(a); }
  10. 	operator T&() { a = "ref T\n"; t = a; return t; }
  11. //	operator const T&() { a = "const ref T\n"; t= a; return const_cast<const T&>(t); }	  (*) FIX
  12. };
  13.  
  14. template <> string A < string >::t = "zero";
  15.  
  16. int main() {
  17. 	string s;
  18. 	A<string> a;
  19. 	s = (string)a;            // uncompilible . fixed by (*)
  20. 	cout << 1 << s;
  21. 	s = a.operator std::string(); // works
  22. 	cout << 2 << s;
  23. 	s = (string&)a;          // wokrs right too
  24. 	cout << 3 << s;
  25. 	s = (const string&)a; // fails and ambigious . fixed by (*)
  26. 	cout << 4 << s;
  27.  
  28. 	return 0;
  29. }
Success #stdin #stdout 0s 15240KB
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Standard input is empty
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1ref T
2T
3ref T
4ref T
https://ideone.com/XaSy15
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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