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Installs a handler into the slot, constructing the new object directly.
template<
    typename CancellationHandler,
    typename... Args>
CancellationHandler & emplace(
    Args &&... args);
          Destroys any existing handler in the slot, then installs the new handler,
          constructing it with the supplied args.
        
The handler is a function object to be called when the signal is emitted. The signature of the handler must be
void handler(boost::asio::cancellation_type_t);
                Arguments to be passed to the CancellationHandler object's
                constructor.
              
A reference to the newly installed handler.
          Handlers installed into the slot via emplace are not required
          to be copy constructible or move constructible.