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  1. #include <iostream>
  2. #include <thread>
  3. #include <utility>
  4.  
  5. using namespace std;
  6.  
  7. template <typename T>
  8. class OnExitImpl : private T
  9. {
  10. public:
  11.     template <typename Y>
  12.     OnExitImpl(Y&& todo) : T(std::forward<Y>(todo)), _doIt(true) {}
  13.  
  14.     OnExitImpl(OnExitImpl&& other) : T(std::move(static_cast<T&>(other))), _doIt(other._doIt)
  15.     {
  16.         other._doIt = false;
  17.     }
  18.  
  19.     ~OnExitImpl()
  20.     {
  21.         if (_doIt)
  22.         {
  23.             (*this)();
  24.         }
  25.     }
  26.  
  27.     void Cancel()
  28.     {
  29.         _doIt = false;
  30.     }
  31.  
  32.     OnExitImpl& operator=(OnExitImpl&& other)
  33.     {
  34.         this->T::operator=(std::move(static_cast<T&>(other)));
  35.         _doIt = other._doIt;
  36.         other._doIt = false;
  37.     }
  38.  
  39. private:
  40.     bool _doIt;
  41. };
  42.  
  43. template <typename T>
  44. OnExitImpl<T> OnExit(T action)
  45. {
  46.     return OnExitImpl<T>(std::move(action));
  47. }
  48.  
  49. int FetchMultithreaded(int stmt)
  50. {
  51.     std::thread* threadPtr = nullptr;
  52.     auto onExit = OnExit([&](){ cout << stmt << endl; });
  53.  
  54.     std::thread fetchThread([&]()
  55.     {
  56.         auto onExit = OnExit([&](){ cout << stmt << endl; });
  57.     });
  58.  
  59.     return 0;
  60. }
  61.  
  62. int main()
  63. {
  64.     return FetchMultithreaded(0);
  65. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
/home/wKP0IY/ccZGAB13.o: In function `FetchMultithreaded(int)':
prog.cpp:(.text+0x5c2): undefined reference to `pthread_create'
collect2: error: ld returned 1 exit status
stdout
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Standard output is empty
https://ideone.com/O6I9nj
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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