Construct a posix::basic_descriptor without opening it.

explicit basic_descriptor(
    boost::asio::io_service & io_service);
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Construct a posix::basic_descriptor on an existing native descriptor.

basic_descriptor(
    boost::asio::io_service & io_service,
    const native_handle_type & native_descriptor);
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Move-construct a posix::basic_descriptor from another.

basic_descriptor(
    basic_descriptor && other);
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