posix::basic_descriptor::basic_descriptor (1 of 2 overloads)

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##### posix::basic_descriptor::basic_descriptor (1 of 2 overloads)

Construct a basic_descriptor without opening it.

    basic_descriptor(
        boost::asio::io_service & io_service);

This constructor creates a descriptor without opening it.

###### Parameters

io_service

  The io_service object that the descriptor will use to dispatch handlers for any asynchronous operations performed on the descriptor.