A gauss integral from -infini to +infini using ROOT

hello !

i am not an expert in ROOT that’s why i am posting this question as i couldn’t find anything in ROOT manual.
How can an infinit gaussian integral be calculated by ROOT??
The function TF1::Integral requires boundaries. Should I call a DGAUSS from CERNLIB or there is some easier way to do it from ROOT??
Thanks in advance.

~~H.