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  1. #include <iostream>
  2. #include <memory>
  3. #include <cstring>
  4.  
  5. struct A
  6. {
  7.   std::unique_ptr<int> up_myInt;
  8.   A(int val)
  9.   :
  10.     up_myInt(std::make_unique<int>(val))
  11.   {}
  12. };
  13.  
  14. int main()
  15. {
  16. 	A a(1);
  17. 	{
  18. 	  A b(2);
  19. 	  memcpy(&a, &b, sizeof(A));
  20. 	  std::cout << *a.up_myInt << std::endl;
  21. 	  //b gets deleted, and the memory b.up_myInt points to is gone
  22. 	}
  23. 	std::cout << *a.up_myInt << std::endl;
  24. 	return 0;
  25. }
Runtime error #stdin #stdout #stderr 0s 3472KB
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stdin
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Standard input is empty
stdout
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2
0
stderr
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*** Error in `./prog': double free or corruption (fasttop): 0x08433a20 ***
https://ideone.com/46gFzw
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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