Construct a posix::stream_descriptor without opening it.

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

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

stream_descriptor(
    stream_descriptor && other);
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