On Wed, Mar 15, 2017 at 09:42:37PM +0100, Mohamed Abou-Hussein wrote: > I have a technical problem. I am trying to create a collector > collector.hpp. > The typename TCollector vairable, is a class derived from Collector.hpp. So > I know I have to define a new class that inherits from collector.hpp. > However, in this class I'll need also to define the typename collector in > the subclass or I'll just create a the subclass without defining it. But > then when creating an instance, the problem of specifying the variable type > would still be there. I am kind of clueless what specifically to do and I > hope you can help me with that. > > for your ref http://docs.osmcode.org/libosmium/latest/collector_8hpp.html
I answered the same question on IRC already. But here for everybody else who might stumble across this: This uses CRTP, see here for an explanation: https://en.wikipedia.org/wiki/Curiously_recurring_template_pattern Jochen -- Jochen Topf [email protected] https://www.jochentopf.com/ +49-351-31778688 _______________________________________________ dev mailing list [email protected] https://lists.openstreetmap.org/listinfo/dev
