I apologize, I didn't replace all names to make code more readable... It was just P ... that was P's ctor... It's Get, not GetSpot x.template Get( 5 ); I've added to default argument to the out-of-class definition as well and then it works... does it make any sense? H

I put the code here: http://codepad.org/6tLNKGvO 1) g++3.4 complains about putting the default parameters in the declaration and the definition of GetSpot<> 2) VS2005 compiles it fine. As I said in my previous email, when the default parameter "Interp()" is not put in the definition of GetSpot<> debugging shows that "i" has not been constructed properly. When I add "Interp()" to the definition also, debugs works fine. In Release, the same behaviour is observed. Regards,