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  1. #include <iostream>
  2. #include <cstddef>
  3. using namespace std;
  4.  
  5. struct Containing {
  6. 	int x;
  7.     struct {
  8.         Containing * get_containing () {
  9.             return reinterpret_cast<Containing *> (
  10.                 this - offsetof (Containing, inner)
  11.             );
  12.         }
  13.         int y;
  14.     } inner;
  15. };
  16.  
  17.  
  18. int main () {
  19.     Containing c;
  20.     std::cout
  21.         << (c.inner.get_containing () == &c ? "success" : "fail")
  22.         << std::endl;
  23. }
Success #stdin #stdout 0s 3296KB
comments (?)
stdin
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Standard input is empty
stdout
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fail
https://ideone.com/2sr2JF
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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