std future and std promise

The following example sets a promise to be consumed by another thread:

{
    auto promise = std::promise<std::string>();
    
    auto producer = std::thread([&]
    {
        promise.set_value("Hello World");
    });
    
    auto future = promise.get_future();
    
    auto consumer = std::thread([&]
    {
        std::cout << future.get();
    });
    
    producer.join();
    consumer.join();
}

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