On 17 May 2017, at 8:55 am, Denis Rouzaud <denis.rouzaud at gmail.com> wrote: > > > Hi Phil, > > Thanks a lot for your reply. > I was hoping not to go that way to avoid any redundancy and some weakness in the code (any change to the template class methods would need to be propagated to all implementations). > > There is no other way? I don't think so. Phil