Modern C++ Programming Cookbook

How to do it...

To properly handle exceptions thrown in a worker thread from the main thread or the thread where it was joined, do the following (assuming multiple exceptions can be thrown from multiple threads):

1. Use a global container to hold instances of std::exception_ptr:

        std::vector<std::exception_ptr> g_exceptions;

2. Use a global mutex to synchronize access to the shared container:

        std::mutex g_mutex;

3. Use a try...catch block for the code that is being executed in the top-level thread function. Use std::current_exception() to capture the current exception and wrap a copy or its reference into an std::exception_ptr pointer, which is added to the shared container for exceptions:

        void func1()        { throw std::exception("exception 1"); ...