How to read an sf::Packet twice

[Vaclav]

Hey,
I want to read an sf::Packet instance two times. I do not want to copy it and read the other instance for the second time.
I looked at the API: http://sfml-dev.org/documentation/2.1/classsf_1_1Packet.php
And I didn't find anything like rewind. So this isn't possible, is it?
If I try to read it when I reached the packet's end, it goes to an error state, and doesn't rewind, does it?

[Laurent]

You're right, there's no way to rewind a packet.