git.sesse.net Git - nageru/blob - shared/post_to_main_thread.h

   1 #ifndef _POST_TO_MAIN_THREAD_H
   2 #define _POST_TO_MAIN_THREAD_H 1
   3
   4 #include <QApplication>
   5 #include <QObject>
   6 #include <future>
   7 #include <memory>
   8
   9 // http://stackoverflow.com/questions/21646467/how-to-execute-a-functor-in-a-given-thread-in-qt-gcd-style
  10 template<typename F>
  11 static inline void post_to_main_thread(F &&fun)
  12 {
  13         QObject signalSource;
  14         QObject::connect(&signalSource, &QObject::destroyed, qApp, std::move(fun));
  15 }
  16
  17 template<typename F>
  18 static inline void post_to_main_thread_and_wait(F &&fun)
  19 {
  20         std::promise<void> done_promise;
  21         std::future<void> done = done_promise.get_future();
  22         post_to_main_thread(std::move(fun));
  23         post_to_main_thread([&done_promise] { done_promise.set_value(); });
  24         done.wait();
  25 }
  26
  27 #endif  // !defined(_POST_TO_MAIN_THREAD_H)