----- Original Message ----- From: "Hansi" <hansipet@web.de> To: <boost-users@lists.boost.org> Sent: Tuesday, July 15, 2008 9:24 AM Subject: [Boost-users] Beginner design question Hello, I have to make a library which provides a few classes with different implementation. This classes should have a common interface. Normally I would use derived classes from the common interface, but this classes should be really fast. What is the best way to provide a common interface and to not have the overhead of polymorphic classes? -- Hi, The question is if you need runtime polymorphism or static one? If you have some performances constraints, I propose you to use static polymorphism as far as you can and switch to runtime polymorphism when statics no work any more. The Adobe Poly library helps you to make the switch (see http://stlab.adobe.com/wiki/images/c/c9/Boost_poly.pdf and http://homepages.fh-regensburg.de/~mpool/mpool07/proceedings/5.pdf) Hopping that helps you. Vicente