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  1. #include <iostream>
  2.  
  3. struct X 
  4. {
  5. 	X() { std::cout << "X ctor\n"; }
  6. 	~X() { std::cout << "X dtor\n"; }
  7. };
  8.  
  9. struct M
  10. {
  11. 	M() 
  12. 	{ 
  13. 		if( ++cnt == 1) x = new X;
  14. 	}
  15. 	~M()
  16. 	{
  17. 		if( !--cnt ) delete x;
  18. 	}
  19. private:
  20. 	static int cnt;
  21. 	static X* x;
  22. };
  23.  
  24. int M::cnt = 0;
  25. X* M::x = nullptr;
  26.  
  27. int main() {
  28.  
  29. 	{
  30. 		M m;
  31. 		M m2;
  32. 	}	
  33.  
  34. 	M* mp = new M;
  35.  
  36. 	M m3;
  37.  
  38. 	delete mp;
  39.  
  40. 	return 0;
  41. }
Success #stdin #stdout 0s 3472KB
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stdin
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Standard input is empty
stdout
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X ctor
X dtor
X ctor
X dtor
https://ideone.com/KflMl5
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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