I have a question/doubt about the following snippet given n the book “C++ concurrency”. I want to know is there a technical reason(s) for putting the t.join() after the try catch block instead of putting it inside the try block.

//callable whose defintion is not related to this question
struct my_func; 
void f()
 {
  int some_local_state = 0;
  func my_func(some_local_state);
  std::thread t(my_func);
  try {
    do_something_in_current_thread();
    //can we put/move the t.join() here? instead of having it at point #2
  } catch (...) {
    t.join();
    throw;
  }
  //author put the t.join() here why not inside try block
  t.join(); //#2
}

As you can see, the author has placed the t.join() at point #2. But I want to know why don’t we just place it inside the try block itself, just after the call to do_something_in_current_thread(). I mean, are there any technical cases/advantages of placing it at #2 instead of inside the try block that I may not be aware of as I’ve just started learning multi-threading.

As a beginner I can’t think of any case/advantage of having it at #2 instead inside try block.