Hi, I found rational.hpp uses both gcd(x,y) and gcd<IntType>(x,y). It causes name clashes with the gcd() function in my namespace. Would be more error free by using gcd<IntType>(x,y) throughout? Anyone can advise? See http://groups.google.com/group/comp.lang.c++/browse_thread/thread/23e9bb515d... Regards, Shin Yee