Hi, Dominic. I'm not sure this method is the best option for what you want, but I don't have any ready alternatives myself, so I'll just answer your question and move on.
I would recommend reading the following FAQ: http://www.parashift.com/c++-faq-lite/const-correctness.html In that context, I might recommend changing your declaration: // begin code bool first; // end code to this: // begin code mutable bool first; // end code In the event that your compiler doesn't support keyword "mutable", you can fake it with a member pointer that you have to initialize in your constructor and cleanup in your destructor, but that is a little clunky, and I would avoid it if I could. You would change this: // begin code bool first; // end code to this: // begin code bool* first; // end code and then do the appropriate initialization and cleanup. I hope this helps... D.J. On Fri, Jan 8, 2010 at 3:50 PM, Dominic Stalder <dominic.stal...@bluewin.ch> wrote: > Hi there > > I would like to read the OpenGL extensions with isGLExtensionSupported(), > but for this I need a draw context. I registred a DrawCallback Class, see > below. I need to call the operator() method only once, but because this > method is const, I cannot write to the member variable bool first. How can I > resolve this problem? > > class GameViewOSGDrawCallback : public osg::Camera::DrawCallback > { > private: > GameViewOSG *parent; > bool first; > > public: > GameViewOSGDrawCallback(GameViewOSG* parent=0); > > virtual void operator()(const osg::Camera&) const; > }; > > Thanks a lot > Dominic > _______________________________________________ > 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
