The C++ sample code here http://www.ginac.de/tutorial/Symmetrization.html#Symmetrization
is not working for me with the latest GiNaC (version 1.6.2). I get the following error

main.cpp:58:27: error: no member named 'symmetrize' in 'GiNaC::indexed'

        cout << indexed(A, i, j).symmetrize(i,j) << endl;

Is the tutorial outdated?

Regards,
Ruben