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  1. #include <iostream>
  2.  
  3. template<int, int>
  4. struct G1
  5. {
  6. 	G1()
  7. 	{ 
  8. 		std::cout << "G1\n";
  9. 	}
  10. };
  11.  
  12. template<int, int>
  13. struct G2
  14. {
  15. 	G2()
  16. 	{ 
  17. 		std::cout << "G2\n";
  18. 	}
  19. };
  20.  
  21. template<template<int, int> class T>
  22. struct Foo
  23. {
  24. 	T<7, 42> M;
  25. };
  26.  
  27. template<bool Condition, template<int, int> class T, template<int, int> class U> 
  28. struct Conditional_asfdlol 
  29. { 
  30. 	template<int A, int  B> 
  31. 	struct Type : public T<A, B> 
  32. 	{ 
  33. 	}; 
  34. };
  35.  
  36. template<bool Condition, template<int, int> class T, template<int, int> class U>
  37. struct Conditional_camper
  38. {
  39. 	template<int A, int  B>
  40. 	struct Apply
  41. 	{
  42. 		typedef U<A,B> Type;
  43. 	};
  44. };
  45.  
  46. int main()
  47. {
  48. 	Foo<G1> F1;
  49. 	Foo<G2> F2;
  50.  
  51. 	Foo<Conditional_asfdlol<true, G1, G2>::Type> F3;
  52. 	Foo<Conditional_camper<false, G1, G2>::Apply> F4; // Nicht das gewünschte Ergebnis
  53. }
Success #stdin #stdout 0s 3296KB
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G1
G2
G1
https://ideone.com/LAV7GW
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
secret

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