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  1. #include <iostream>
  2. #include <type_traits>   
  3. using namespace std;
  4.  
  5. // Non-trivially-copyable type.
  6. struct NTC
  7. {
  8. 	int x;    	
  9. 	NTC(int mX) : x(mX) { }    
  10. 	~NTC() { cout << "boop." << x << endl; }
  11. };
  12.  
  13. int main() 
  14. {
  15. 	using AS = aligned_storage_t<sizeof(NTC), alignof(NTC)>;
  16.  
  17.     // Create two `std::aligned_storage` instances
  18.     // and "fill" them with two "placement-new-constructed" 
  19.     // `NTC` instances.
  20. 	AS as1, as2;    	
  21. 	new (&as1) NTC{2};
  22. 	new (&as2) NTC{5};
  23.  
  24.     // Swap the `aligned_storages`, not their contents.
  25. 	std::swap(as1, as2);
  26.  
  27.     // Destroy the 
  28.     NTC& in1{*static_cast<NTC*>(static_cast<void*>(&as1))};
  29. 	NTC& in2{*static_cast<NTC*>(static_cast<void*>(&as2))};    	
  30. 	in1.~NTC();
  31. 	in2.~NTC();
  32.  
  33. 	return 0;
  34. }
Success #stdin #stdout 0s 3096KB
comments (?)
stdin 
Standard input is empty
stdout 
boop.5
boop.2
https://ideone.com/zgQz1P
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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