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  1. #include <iostream>
  2. #include <algorithm>
  3. #include <stdexcept>
  4.  
  5. /*
  6.  *  Hilfskonstrukte
  7.  */
  8.  
  9. template <typename F>
  10. class CleanupHelper {
  11. 	public:
  12. 		CleanupHelper (F f) : m_f (std::move (f)) {}
  13. 		~CleanupHelper () { m_f (); }
  14. 	private:
  15. 		F m_f;
  16. };
  17.  
  18. template <typename F>
  19. CleanupHelper<F> cleanup (F f) { return { std::move (f) }; }
  20.  
  21. /*
  22.  * Usercode
  23.  */
  24.  
  25. void tuwas () {
  26. 	std::cout << "Hole a\n";
  27. 	int a = 42; // a holen
  28. 	if (a == 0) throw std::runtime_error ("A initialization failed");
  29. 	auto cleanA = cleanup ([&] () { std::cout << "Cleaning A\n"; });
  30.  
  31. 	std::cout << "Hole b\n";
  32. 	int b = 3; // b holen
  33. 	if (b == 0) throw std::runtime_error ("B initialization failed");
  34. 	auto cleanB = cleanup ([&] () { std::cout << "Cleaning B\n"; });
  35.  
  36. 	std::cout << "Hole c\n";
  37. 	int c = 0; // c holen
  38. 	if (c == 0) throw std::runtime_error ("C initialization failed");
  39. 	auto cleanC = cleanup ([&] () { std::cout << "Cleaning C\n"; });
  40. }
  41.  
  42. int main() {
  43. 	try {
  44. 		tuwas ();
  45. 	} catch (std::exception& e) {
  46. 		std::cout << "Error: " << e.what () << std::endl;
  47. 	}
  48. 	return 0;
  49. }
Success #stdin #stdout 0s 3472KB
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stdin
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Standard input is empty
stdout
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Hole a
Hole b
Hole c
Cleaning B
Cleaning A
Error: C initialization failed
https://ideone.com/5qJKch
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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