Hi Jean-Michel, > I don't undertand why with the latest release (3.4.6) of gcc we use (it was > OK with 3.2.3 release), Main.cpp doesn't compile if I don't define USE_THIS: ISO 14882 requires two-phase lookup. That means that the m_CTemp1 is not visible in the context of CTemp2 without explicitly qualifying that it is in reference to this->m_CTemp1 or to CTemp1<T>::m_CTemp1 or providing a using CTemp1<T>::m_CTemp1 statement. Previous versions of GCC did not use two-phase lookup, and were not compliant with ISO 14882 on that issue. (Which incurred other potentially insidious misbehavior.) > In fact, I don't undertand why the line t2.m_CTemp1 = 3; is correct in > Main.cpp and not m_CTemp1 = 3; in CTemp2_affecter(). In main, the t2.m_CTemp1 has CTemp2 instantiated, and hence is not affected by the two phase lookup. The "t2." part is sufficient to access the public member variable. Happy holidays, --Eljay
