I was trying to find some decent way to declare named constants in my code and ended up with the following snippet : struct const_one { typedef int type; const_one() {} template<class T> const_one(T const& ) {} template<class T> operator type() const { static type const v = {1}; return v; } template<class T> operator T() const { static T const v = {1}; return v; } }; static const const_one one_; This allow me to have the following behavior : int k = one_; float e = one_; and have proper transtyping taking place when needed. Turning this into a macro allow to declare a large sample of named constant that auto-transtype them when needed. Now funny thing is that this structure allow me to do stuff like : float k = one_ / ( 1. + three_); Now if I remove the operator type(), I can't. But if i add a printf statement in this one, it is never called. Do someone has a clue about this behavior or am I playing with some undefined behavior ? TIA -- ___________________________________________ Joel Falcou - Assistant Professor PARALL Team - LRI - Universite Paris Sud XI Tel : (+33)1 69 15 66 35