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  1. #include <iostream>
  2.  
  3. using E = int;
  4. using r = int;
  5.  
  6. template<typename TYPE>
  7. class Target5
  8. {
  9. public:
  10. 	Target5(const TYPE &value) : value(value) {}
  11. 	TYPE value;
  12.  
  13. 	template <typename T>
  14. 	void OneParam(T a)
  15. 	{
  16. 		std::cout << "Target5::OneParam(" << value << "," << a << ")\n";
  17.  
  18. 		typedef void (Target5<E>::*MethodTypeToCall)(T);
  19. 		// Here, the compiler picks the right overload
  20. 		MethodTypeToCall toCall = &Target5<E>::Private<T>;
  21. 		// In this case, the compiler does not let us write the following line (parse error):
  22. 		//MethodTypeToCall toCall = &Target5<E>::Private<t;;
  23. 		(this->*toCall)(a);
  24. 	}
  25.  
  26. 	template <typename T1, typename T2>
  27. 	void TwoParam(T1 a, T2 b)
  28. 	{
  29. 		std::cout << "Target5::TwoParam(" << value << "," << a << "," << b << ")\n";
  30.  
  31. 		typedef void (Target5<E>::*MethodTypeToCall)(T1, T2);
  32. 		MethodTypeToCall toCall = &Target5<E>::Private<T1, T2>; // compiler picks the right overload
  33. 		// you can't add the method's template parameters to the end of that line
  34. 		(this->*toCall)(a, b);
  35. 	}
  36.  
  37. private:
  38.  
  39. 	template <typename T>
  40. 	void Private(T a)
  41. 	{
  42. 		std::cout << "Target5::Private(" << value << "," << a << ")\n";
  43. 	}
  44. 	template <typename T1, typename T2>
  45. 	void Private(T1 a, T2 b)
  46. 	{
  47. 		std::cout << "Target5::Private(" << value << "," << a << "," << b << ")\n";
  48. 	}
  49. };
  50.  
  51. inline
  52. void HoldingAPointerToTemplateMemberInTemplateClass()
  53. {
  54. 	Target5<r> target('c');
  55.  
  56. 	void (Target5<r>::*oneParam)(int) = &Target5<r>::OneParam;
  57. 	(target.*oneParam)(7);
  58. 	void (Target5<r>::*twoParam)(float, int) = &Target5<r>::TwoParam;
  59. 	(target.*twoParam)(7.5, 7);
  60. }
  61.  
  62. int main()
  63. {
  64. 	HoldingAPointerToTemplateMemberInTemplateClass();
  65. }
Success #stdin #stdout 0s 15232KB
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stdin
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Standard input is empty
stdout
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Target5::OneParam(99,7)
Target5::Private(99,7)
Target5::TwoParam(99,7.5,7)
Target5::Private(99,7.5,7)
https://ideone.com/Gx9cCP
language:
C++ 4.3.2 (gcc-4.3.2)
created:
5 years ago
visibility:
public

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