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  1. #include <iostream>
  2.  
  3. struct Settings
  4. {
  5.     Settings(int v_) : v(v_) {}
  6.     int v;
  7. };
  8.  
  9. //http://stackoverflow.com/a/11255852
  10. #define useHardwareWith(settings)                   \
  11. acquireHardware(settings);                          \
  12. for(                                                \
  13.   struct                                            \
  14.   {                                                 \
  15.     bool done()                                     \
  16.     {                                               \
  17.       return done_;                                 \
  18.     }                                               \
  19.     bool run()                                      \
  20.     {                                               \
  21.       releaseHardware();                            \
  22.       done_ = true;                                 \
  23.     }                                               \
  24.     bool done_;                                     \
  25.   } magic = {false}; !magic.done() ; magic.run())
  26.  
  27. void acquireHardware(const Settings& settings)
  28. {
  29.   std::cout << "acquire(" << settings.v << ")\n";
  30. }
  31.  
  32. void releaseHardware()
  33. {
  34.   std::cout << "release()\n";
  35. }
  36.  
  37. int main()
  38. {
  39.   Settings settings(1);
  40.   useHardwareWith(settings)
  41.   {
  42.     std::cout << "Doing important hardware stuff\n";
  43.   }
  44. }
  45.  
Success #stdin #stdout 0s 3340KB
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stdin
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Standard input is empty
stdout
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acquire(1)
Doing important hardware stuff
release()
https://ideone.com/eT91hD
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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