#include <iostream>
#include <thread>
#include <future>
#include <stdexcept>
#include <string>

using namespace std ;

void worker_with_promise(promise<void>&& promise_obj)
{
    try
    {
        // Simulate work and an error
        throw runtime_error("Error occurred in manual thread management.");
        // If no exception, you could fulfill the promise like this:
        // promise_obj.set_value();
    }
    catch (...)
    {
        // Catch the exception within the worker thread and store it in the promise
        promise_obj.set_exception(current_exception());
    }
}

int main()
{
    promise<void> promise_obj;
    future<void> future_obj = promise_obj.get_future();
    thread th(worker_with_promise, move(promise_obj));

    try
    {
        // Wait for the result/exception
        future_obj.get();
        cout << "Thread finished successfully (should not happen in this example)." << endl;
    }
    catch (const runtime_error& e)
    {
        cerr << "Caught exception in main: " << e.what() << endl;
    }

    th.join(); // Clean up the thread
    return 0;
}