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  1. #include <iostream>
  2. #include <memory>
  3. using namespace std;
  4.  
  5. class Test {
  6. 	int n;
  7. public:
  8. 	Test(int n) : n{n} { cout<<"Constructor"<<n<<endl; }
  9. 	void show() { cout <<"Do something"<<n<<endl; }
  10. 	~Test() { cout << "Destructor"<<n<<endl; }
  11. };
  12.  
  13. class TestDeleterWrong {
  14. public:
  15. 	void operator()(Test* x) {
  16. 		x->show(); 
  17. 	} 
  18. };
  19. class TestDeleterRight {
  20. public:
  21. 	void operator()(Test* x) {
  22. 		x->show(); 
  23. 		delete x; 
  24. 	} 
  25. };
  26.  
  27. int main() {
  28. 	{
  29. 		auto p = make_unique<Test>(1);    //ok
  30. 	}
  31. 	{
  32. 		auto p = unique_ptr<Test>(new Test(2));    //ok
  33. 	}
  34. 	{
  35. 		auto p = unique_ptr<Test, TestDeleterWrong>(new Test(3));   // no 
  36. 	}
  37. 	{
  38. 		auto p = unique_ptr<Test, TestDeleterRight>(new Test(4));   // ok 
  39. 	}
  40. 	return 0;
  41. }
Success #stdin #stdout 0s 4272KB
comments (?)
stdin
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Standard input is empty
stdout
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Constructor1
Destructor1
Constructor2
Destructor2
Constructor3
Do something3
Constructor4
Do something4
Destructor4
https://ideone.com/2cYNK9
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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