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Construct a descriptor on an existing native descriptor.
descriptor(
    boost::asio::io_context & io_context,
    const native_handle_type & native_descriptor);
This constructor creates a descriptor object to hold an existing native descriptor.
                  The io_context
                  object that the descriptor will use to dispatch handlers for any
                  asynchronous operations performed on the descriptor.
                
A native descriptor.
Thrown on failure.