Gent's, I was wondering the same.
A templated Vec class isn't all that hard to implement and maintain, it's pretty straight forward. What's a pain is a templated Matrix class, although totally doable (from experience). I would gladly help if someone wanted to start taking on the task. -B -----Original Message----- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Mathias Goldau Sent: Friday, October 22, 2010 6:46 AM To: osg-users@lists.openscenegraph.org Subject: Re: [osg-users] Why is Vec not a template? Am 22.10.2010 14:37, Robert Osfield wrote: > Hi Mathias, > > On Fri, Oct 22, 2010 at 1:01 PM, Mathias Goldau > <m...@informatik.uni-leipzig.de> wrote: >> I just wondered why Vec3 and related Vec classes are all different classes >> and >> why they aren't realized as templates? > > Because templates aren't always the perfect tool for the job. > > Three main reasons : specialization of types required in various > methods makes templates more awkward to write and maintain, secondly > templates are slow to compile - the more low level templates you use > the greater the slow down, and finally templates are pain in the butt > to decifer when you get compile errors. ok, I could imagine that at least the value_type for all Vec3 derivates would be a good choice for a template, since the operations for Vec3f and Vec3d, etc. are exactly the same (I guess). I really could imagine that a template< size_t, typename value_type > is indeed really awkward and hard to maintain. But so you will have much more code duplication. In point of compile time: Hmm the Vec[2-4] classes are not very big, there are many other templates in OSG which have much higher complexity. Mathias -- Institut für Informatik Universität Leipzig Johannisgasse 26, 04103 Leipzig Phone: +493419732283 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
