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  1. #include <iostream>
  2. #include <utility>
  3. #include <functional>
  4.  
  5. using namespace std;
  6.  
  7. // -----------------------------------------------
  8. template<typename T, typename F>
  9. struct Test
  10. {
  11. 	T m_resource;
  12. 	F m_deleter; 
  13.  
  14. 	Test(T&& resource, F&& deleter) 
  15. 	: m_resource(move(resource)), m_deleter(move(deleter))
  16. 	{
  17. 	}
  18. 	Test(T const& resource, F const& deleter) 
  19. 	: m_resource(resource), m_deleter(deleter)
  20. 	{
  21. 	}
  22. };
  23. // -----------------------------------------------
  24.  
  25. // -----------------------------------------------
  26. template<typename T, typename F>
  27. Test<T, F> test(T&& t, F&& f)
  28. {
  29. 	return Test<T, F>(move(t), move(f));
  30. }
  31. template<typename T, typename F>
  32. Test<T, F> test(T const& t, F const& f)
  33. {
  34. 	return Test<T, F>(t, f);
  35. }
  36. // -----------------------------------------------
  37.  
  38. int main() 
  39. {
  40. 	// construct from temporaries --------------------
  41. 	Test<int*, function<void(int*)>> t(new int, [](int *k) {}); // OK - constructor
  42. 	auto tm = test(new int, [](int *k){});                      // OK - maker function
  43. 	// -----------------------------------------------
  44.  
  45. 	// construct from l-values -----------------------
  46. 	int *N = new int(24);
  47. 	auto F = function<void(int*)>([](int *k){});
  48.  
  49. 	Test<int*, function<void(int*)>> tt(N, F); // OK    - construction
  50. 	//auto m = test(N, F);                       // Error - maker function
  51. 	// -----------------------------------------------
  52.  
  53. 	return 0;
  54. }
Success #stdin #stdout 0s 3468KB
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https://ideone.com/wO4akf
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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