How do I get rid of these thread errors in C++?

Question

I'm having some problems with this program I'm making in C++. For what I'm doing here:

{
    GridWorld world;
    string input = "";

    while (input != "q")
    {
        thread render(&GridWorld::Render, GridWorld());
        render.join();

        input = world.GetInput();

        thread thread_update(&GridWorld::Update, GridWorld());

        thread_update.join();

    }

    cout << "Thank you for playing\n";
}

I get these errors

It used to work before, but now it is not anymore.

Can someone please help

Please post a https://stackoverflow.com/help/minimal-reproducible-example — M.M, Aug 15 '21 at 23:51
Creating a thread and then immediately joining it is pointless. In the posted code just call the functions directly and remove the threading. — Richard Critten, Aug 15 '21 at 23:52
also check your compiler compilers the minimal example at https://stackoverflow.com/a/10673671/1505939 — M.M, Aug 15 '21 at 23:53
@RichardCritten presumably this is a minimalized example of some more complicated case that won't join immediately, to isolate the error message — M.M, Aug 15 '21 at 23:54

score 0 · Answer 1 · answered Aug 16 '21 at 01:25

Have you tried using lambda expressions?

...
thread render([]() { GridWorld().Render(); });
...
thread thread_update([]() { GridWorld().Update(); });
...

Or maybe

...
thread render([&world]() { world.Render(); });
...
thread thread_update([&world]() { world.Update(); });
...

How do I get rid of these thread errors in C++?

1 Answers1