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  1. #include <functional>
  2. #include <iostream>
  3.  
  4. struct FData
  5. {
  6.     int id = 1;
  7.     int x = 5;
  8. };
  9.  
  10. std::function<void()> test(const FData& in)
  11. {
  12.     return [copy = in]()
  13.     {
  14.         std::cout << "addr=" << &copy << " id=" << copy.id << " x=" << copy.x << std::endl;
  15.     };
  16. }
  17.  
  18. int main()
  19. {
  20.     std::function<void()> callback;
  21.  
  22.     {//scoped to destroy obj1
  23.         FData obj1;
  24.  
  25.         std::cout << "addr=" << &obj1 << " id=" << obj1.id << " x=" << obj1.x << std::endl;
  26.  
  27.         callback = test(obj1);
  28.     }
  29.  
  30.     {
  31.         FData obj2;
  32.         //attempt to overwrite obj1 memory
  33.         obj2.id = 2;
  34.         obj2.x = 7;
  35.  
  36.         std::cout << "addr=" << &obj2 << " id=" << obj2.id << " x=" << obj2.x << std::endl;
  37.  
  38.         callback();
  39.     }
  40.  
  41.     return 0;
  42. }
Success #stdin #stdout 0s 4544KB
comments (?)
stdin
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Standard input is empty
stdout
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addr=0x7ffe538c1ee8 id=1 x=5
addr=0x7ffe538c1ee8 id=2 x=7
addr=0x7ffe538c1ef0 id=1 x=5
https://ideone.com/WagIuc
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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