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  1. #include <iostream>
  2. #include <type_traits>
  3. #include <stdexcept>
  4. #include <utility>
  5.  
  6. template <class Object, class MemFun, class... Args>
  7. struct HasNoExceptMemFun
  8. {
  9. 	static constexpr bool value =
  10. 	    noexcept (((std::declval <Object> ()).*(MemFun ()))(std::declval <Args>()...));
  11. };
  12.  
  13. template <bool which>
  14. class Is;
  15.  
  16. template <>
  17. struct Is <false>
  18. {
  19. 	void operator () ()
  20. 	{
  21. 	    std::cout << "false" << std::endl;
  22. 	}
  23. };
  24.  
  25. template <>
  26. struct Is <true>
  27. {
  28. 	void operator () ()
  29. 	{
  30. 	    std::cout << "true" << std::endl;
  31. 	}
  32. };
  33.  
  34. class Foo
  35. {
  36. 	Foo (int) {}
  37.  
  38. 	public:
  39.  
  40. 		void Baz (int) noexcept (true)
  41. 		{
  42. 		}
  43. };
  44.  
  45. class Bar
  46. {
  47. 	public:
  48.  
  49. 		void Baz (int) throw (std::runtime_error)
  50. 		{
  51. 			throw std::runtime_error ("help!");
  52. 		}
  53. };
  54.  
  55. template <typename T, typename F>
  56. struct selection
  57. {
  58. 	static void dispatch ()
  59. 	{
  60. 	    Is <HasNoExceptMemFun <T, F, int>::value> () ();
  61. 	}
  62. };
  63.  
  64. int main() {
  65. 	selection <Foo, decltype (&Foo::Baz)>::dispatch ();
  66. 	selection <Bar, decltype (&Bar::Baz)>::dispatch ();
  67. 	return 0;
  68. }
Success #stdin #stdout 0s 3340KB
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stdin
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Standard input is empty
stdout
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true
false
https://ideone.com/Ek8KMT
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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