fork(11) download
copy 
  1. #include <iostream>
  2. #include <functional>
  3.  
  4. struct PassMe
  5. {
  6. 	PassMe()
  7. 	{
  8. 		std::cout << "default" << std::endl;
  9. 	}
  10. 	PassMe(PassMe const &)
  11. 	{
  12. 		std::cout << "copy" << std::endl;
  13. 	}
  14. 	PassMe(PassMe &&)
  15. 	{
  16. 		std::cout << "move" << std::endl;
  17. 	}
  18. 	PassMe &operator=(PassMe const &)
  19. 	{
  20. 		std::cout << "copy assign" << std::endl;
  21. 		return *this;
  22. 	}
  23. 	PassMe &operator=(PassMe &&)
  24. 	{
  25. 		std::cout << "move assign" << std::endl;
  26. 		return *this;
  27. 	}
  28. 	~PassMe()
  29. 	{
  30. 		std::cout << "destruct" << std::endl;
  31. 	}
  32. 	void go() const
  33. 	{
  34. 		std::cout << "go" << std::endl;
  35. 	}
  36. };
  37.  
  38. template<typename T>
  39. auto f(T const &t)
  40. -> std::function<void()>
  41. {
  42. 	std::cout << "before" << std::endl;
  43. 	std::function<void()> l {[t]{t.go();}};
  44. 	std::cout << "after" << std::endl;
  45. 	return l;
  46. }
  47.  
  48. int main()
  49. {
  50. 	PassMe pm;
  51. 	std::cout << "pre-call" << std::endl;
  52. 	auto l = f(pm);
  53. 	std::cout << "post-call" << std::endl;
  54. 	l();
  55. }
  56.  
Success #stdin #stdout 0s 3476KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
default
pre-call
before
copy
copy
destruct
after
post-call
go
destruct
destruct
https://ideone.com/Eb1xXD
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!