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  1. #include <iostream>
  2. #include <cstdio>
  3. #include <memory>
  4. using namespace std;
  5.  
  6. struct bus_t
  7. {
  8. 	bus_t()
  9. 	{
  10. 		cout << "bus_t()" << endl;
  11. 	}
  12.  
  13. 	~bus_t()
  14. 	{
  15. 		cout << "~bus_t()" << endl;
  16. 	}
  17. };
  18.  
  19. int open_bus(bus_t **bus)
  20. {
  21. 	*bus = new bus_t;
  22. 	return 0;
  23. }
  24.  
  25. int free_bus(bus_t *bus)
  26. {
  27. 	delete bus;
  28. }
  29.  
  30. struct bus_deleter
  31. {
  32.   void operator()(bus_t *bus)
  33.   {
  34.   	free_bus(bus);
  35.   }
  36. };
  37.  
  38. int my_open_bus(unique_ptr<bus_t, bus_deleter> &bus)
  39. {
  40. 	bus_t *temp = nullptr;
  41. 	int ret_code = open_bus(&temp);
  42. 	bus = std::move(decltype(bus)(temp));
  43. 	return ret_code;
  44. }
  45.  
  46. bool foo()
  47. {
  48. 	unique_ptr<bus_t, bus_deleter> bus;
  49. 	if(my_open_bus(bus) != 0)
  50. 	{
  51. 		return false;
  52. 	}
  53.  
  54. 	// jeśli nie chcesz implementować własnego open_bus, to:
  55. 	unique_ptr<bus_t, bus_deleter> bus2;
  56. 	{
  57. 		bus_t *bus_temp = nullptr;
  58. 		if(open_bus(&bus_temp) != 0)
  59. 		{
  60. 			return false;
  61. 		}
  62. 		bus2 = decltype(bus2)(bus_temp);
  63. 	}
  64. }
  65.  
  66. int main() {
  67. 	foo();
  68. 	return 0;
  69. }
Success #stdin #stdout 0s 4508KB
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Standard input is empty
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bus_t()
bus_t()
~bus_t()
~bus_t()
https://ideone.com/WVSlNK
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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