Re: [Boost-users] Multiple templates singletons

Hello! I have a question to this construct: template

class TreeImplBase;

Each specialization of these holds a static std::map< boost::tuple, const TreeImplBase*

...

; which contains the list of the derived template classes.

How can you instantiate a pointer to the class temlate? Class template is an incomplete type. You will not be able to specify a pointer to it. I think you should use boost::fusion inplace. This lib, offers a compile time map (if you map the same time to an instance of it, use a fusion set), which can map a type to an instance. This is what you need. http://spirit.sourceforge.net/dl_more/fusion_v2/libs/fusion/doc/html/fusion/... http://spirit.sourceforge.net/dl_more/fusion_v2/libs/fusion/doc/html/fusion/...

Any comments are appreciated,

Perhaps this is a known design pattern, perhaps there is an easier way of doing this, perhaps there is a boost library which helps with this,

Good Luck, Ovanes