#### posix::stream_descriptor::stream_descriptor

Construct a `posix::stream_descriptor` without opening it.

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

    stream_descriptor(
        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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