Construct an windows::overlapped_handle without opening it.

explicit overlapped_handle(
    asio::io_context & io_context);
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Construct an windows::overlapped_handle on an existing native handle.

overlapped_handle(
    asio::io_context & io_context,
    const native_handle_type & handle);
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Move-construct an windows::overlapped_handle from another.

overlapped_handle(
    overlapped_handle && other);
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