A framework for programs with event loop handler and thread like Qt main() function

event_program_framework.cpp

// some global data for share
data global_for_share;


// define class class_main for all tasks
class class_main
{
public:

  class_main(data* shared_data){  
  // setup (software/hardware)interrupt/callback in class_main constructor function or its member function
  // setup thread in class_main constructor function or its member function
  }

  // setup shared data(data member) in class_main
  data* data_member;
}


int main(int argc, char const *argv[]) {
  data input_shared_data;
  
  // create the main object to represent all tasks inside
  class_main main_object(input_shared_data);  // or use global data as input

 /*
  * setup a system call/system message mechanism for event loop,
  * and receive outside input to trigger callback function of the main_object instance 
  * to drive the main_object instance.
  */
  exec();

  return 0;
}