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  1. #include <iostream>
  2. #include <memory>
  3. #include <vector>
  4. #include <list>
  5. #include <map>
  6. #include <string>
  7. using namespace std;
  8.  
  9. template<class T, class D>
  10. auto make_unique_ptr(T* p, D d) { return unique_ptr<T,D>(p,d); }
  11.  
  12. struct X {
  13. 	X(string s) : s(s)  { cout << (void*)this << " -> ctor: " << s << endl; }
  14. 	~X()                { cout << (void*)this << " -> dtor: " << s << endl; }
  15.  
  16. 	string s;
  17. };
  18.  
  19. int main() {
  20. 	vector<X*> v;
  21. 	list<X*> l;
  22. 	map<X*,X*> m;
  23.  
  24. 	auto vcleaner = make_unique_ptr(&v,
  25. 		[](auto pvs) {
  26. 			for(auto v : *pvs) delete v;
  27. 		}
  28. 	);
  29.  
  30. 	auto lcleaner = make_unique_ptr(&l,
  31. 		[](auto pvs) {
  32. 			for(auto v : *pvs) delete v;
  33. 		}
  34. 	);
  35.  
  36. 	auto mcleaner = make_unique_ptr(&m,
  37. 		[](auto pkvs) {
  38. 			for(const auto& kv : *pkvs) {
  39. 				delete kv.first;
  40. 				delete kv.second;
  41. 			}
  42. 		}
  43. 	);
  44.  
  45. 	cout << "---- fill the map ----" << endl;
  46. 	m[new X("k1")] = new X("w1");
  47. 	m[new X("k2")] = new X("w2");
  48. 	cout << "---- fill the vector ----" << endl;
  49. 	v.push_back(new X("v1"));
  50. 	v.push_back(new X("v2"));
  51. 	cout << "---- fill the list ----" << endl;
  52. 	l.push_back(new X("l1"));
  53. 	cout << "---- release the vector ----" << endl;
  54. 	vcleaner.release();
  55. 	cout << "---- goodbye! ----" << endl;
  56.  
  57. 	// your code goes here
  58. 	return 0;
  59. }
Success #stdin #stdout 0s 3468KB
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Standard input is empty
stdout
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---- fill the map ----
0x88f4a28 -> ctor: w1
0x88f4a50 -> ctor: k1
0x88f4a98 -> ctor: w2
0x88f4ac0 -> ctor: k2
---- fill the vector ----
0x88f4b08 -> ctor: v1
0x88f4b40 -> ctor: v2
---- fill the list ----
0x88f4b18 -> ctor: l1
---- release the vector ----
---- goodbye! ----
0x88f4a50 -> dtor: k1
0x88f4a28 -> dtor: w1
0x88f4ac0 -> dtor: k2
0x88f4a98 -> dtor: w2
0x88f4b18 -> dtor: l1
https://ideone.com/vSlz1i
finalizators of containers
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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