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  1. #include <iostream>
  2. #include <exception>
  3.  
  4. enum scope_exit_condition {
  5.     all, succeed, fail
  6. };
  7.  
  8. template <class F>
  9. class scope_exit_t {
  10. 	F f;
  11. 	scope_exit_condition cond;
  12. 	bool moved;
  13. 	scope_exit_t(const scope_exit_t&);
  14. 	void operator=(const scope_exit_t&);
  15. public:
  16. 	explicit scope_exit_t(F f, scope_exit_condition cond)
  17. 		: f(f)
  18. 		, cond(cond)
  19. 		, moved(false)
  20. 	{
  21. 	}
  22.  
  23. 	scope_exit_t(scope_exit_t&& other)
  24. 		: f(other.f)
  25. 		, cond(other.cond)
  26. 	{
  27. 		other.moved = true;
  28. 	}
  29.  
  30. 	~scope_exit_t()
  31. 	{	
  32. 		if (moved)
  33. 			return;
  34.  
  35. 		if ((cond == all) || (cond == fail) == std::uncaught_exception())
  36. 			f();
  37. 	}
  38. };
  39.  
  40. template <class F>
  41. scope_exit_t<F> scope_exit(F f, scope_exit_condition cond = all)
  42. {
  43. 	return scope_exit_t<F>(f, cond);
  44. }
  45.  
  46. void foo()
  47. {
  48. 	std::cout << "== No exception\n";
  49. 	auto suc = scope_exit([] { std::cout << "Succeed: should appear\n"; }, succeed);
  50. 	auto fai = scope_exit([] { std::cout << "Failed: should not appear\n"; }, fail);
  51. }
  52.  
  53. void bar()
  54. {
  55. 	std::cout << "== Exception throwing\n";
  56. 	auto suc = scope_exit([] { std::cout << "Succeed: should not appear\n"; }, succeed);
  57. 	auto fai = scope_exit([] { std::cout << "Failed: should appear\n"; }, fail);
  58. 	throw std::exception();
  59. }
  60.  
  61. int main()
  62. {
  63. 	try {
  64. 		foo();
  65. 		bar();
  66. 	}
  67. 	catch(...)
  68. 	{		
  69. 	}
  70. }
Success #stdin #stdout 0s 3016KB
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Standard input is empty
stdout
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== No exception
Succeed: should appear
== Exception throwing
Failed: should appear
https://ideone.com/jyuu7b
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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