------- Comment #7 from herwig at gdsys dot de 2008-04-01 07:58 ------- (In reply to comment #5) > (In reply to comment #0) > > The following stripped down code shows pure virtual method definitions for > > both > > a normal base class and a templated base class. To my surprise, the > > templated > > class' body is not generated, > > Your example code contains neither a call to TBase<int>::pvMethod (which would > trigger an implicit instantiation of this function from its template) nor an > explicit instantiation of either the entire class or of this function. > Consequently, the compiler doesn't instantiate your template. > > If you intend to call TBase<int>::pvMethod from somewhere where the definition > of this template is not visible, you need to add an explicit instantiation of > this function for 'int' as the template arg. > > W. >
Wolfgang, thanks for the clarification. I should have realized it myself, though. I solved the problem in another way, but out of pure curiosity: How can I implicitly instatiate this function when it's ought to be called only as a fallback, in case something went wrong (bad cast, call to half-destroyed object from another thread, etc.). It needs to be a generic solution as the real application is a library base template derived from a normal base class used in a CRTP-manner. I think that is why an implicit instantiation is needed. Or am I wrong here? Probably I am. :) Thanks for your reply, Björn! -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33878
