output_stream_writev_all

Writes all bytes in vectors to stream.

This function copies the vectors array before starting the operation, but the buffers referenced by the vectors must remain valid until the returned future completes.

Wraps [method@Gio.OutputStream.writev_all_async].

Parameters:

stream	a [class@Gio.OutputStream]
vectors	vectors to write to stream
io_priority	the IO priority of the request
n_vectors	the number of vectors to write

Returns:

a [class@Dex.Future] that resolves to a `guint64` containing the number of bytes written, or rejects with error.