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  1. #include <atomic>
  2. #include <thread>
  3. #include <future>
  4.  
  5. struct ConditionEvent
  6. {
  7.   ConditionEvent(bool initialCondition = false) :
  8.     condition(initialCondition)
  9.   { }
  10.  
  11.   void Set()
  12.   {
  13.       std::unique_lock<std::mutex> lock(mutex);
  14.       condition = true;
  15.       variable.notify_all();
  16.   }
  17.  
  18.   void Reset()
  19.   {
  20.       std::unique_lock<std::mutex> lock(mutex);
  21.       condition = false;
  22.   }
  23.  
  24.   void Wait()
  25.   {
  26.       std::unique_lock<std::mutex> lock(mutex);
  27.       variable.wait(lock, [this] { return IsSet(); });
  28.   }
  29.  
  30.   bool IsSet()
  31.   {
  32.       return condition;
  33.   }
  34.  
  35. private:
  36.     std::atomic<bool> condition;
  37.     std::mutex mutex;
  38.     std::condition_variable variable;
  39. };
  40.  
  41. int main()
  42. {
  43.     ConditionEvent event;
  44.  
  45.     auto f = std::async(std::launch::async, [&] { event.Set(); });
  46.  
  47.     event.Wait();
  48.     f.get();
  49. }
Success #stdin #stdout 0s 11232KB
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https://ideone.com/BTyqRK
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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