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  1. #include <functional>
  2.  
  3. #include <fcntl.h>
  4. #include <sys/types.h>
  5. #include <unistd.h>
  6.  
  7. template<typename F>
  8. class finally
  9. {
  10. public:
  11.     template<typename... Args>
  12.     finally<F>(F action, Args&&... args) :
  13.         _action([action, &args...]{ action(std::forward<Args>(args)...); }) {}
  14.  
  15.     ~finally()
  16.     try
  17.     {
  18.         if (enabled)
  19.             _action();
  20.     }
  21.     catch (...)
  22.     {
  23.         // Logging and stuff
  24.     }
  25.  
  26.     bool enabled = true;
  27.  
  28. private:
  29.     std::function<void()> _action;
  30. };
  31.  
  32. int main()
  33. {
  34.     int fd = open("/proc/mounts", O_RDONLY);
  35.     finally<int(int)> f(close, fd);
  36. }
Success #stdin #stdout 0s 3408KB
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https://ideone.com/iThn0i
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
secret

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