Re: [gtkmm] GTKMM classes handling local variables

[Ian Michell <ian michell hanzi co uk>]

Murray Cumming Comneon com wrote:

> > Thanks 
> > for the advice, I think I will give 
> > GTK::Manage a try, I think it 
> > will take a little getting used to, usually 90% of my c++ 
> > code is based 
> > around pointers, even my old GTK stuff (I used to wrap GTK into C++ 
> > before I discovered GTKMM). I would have thought the GTKMM team would 
> > have catered for the use of local varibles in some way,
> >    
>
> This is basic C++ - you might read about "scope" in a C++ book.
>
> You might be used to using pointers instead, but you can use pointers here
> as well, as people have pointed out. As with Qt, when you use pointers you
> need to use new() or some create() function to get the pointer value. And
> you need to either a) use delete some time later, or b) use some
> memory-management system such as manage() or Qt's implicit manage(). So
> there is nothing unusual or wrong about this. I think you are
> mis-remembering your previous experience.
>
> Maybe you think that the gtkmm method should copy your local Label instance,
> by value, just as it would copy a std::string local instance. But
> Gtk::Widgets can not be copied, and it probably would not make sense to do
> so. See the archive for more theory about that, but you would probably not
> find that interesting.
>
> You might find this useful:
> http://www.gtkmm.org/gtkmm2/docs/tutorial/html/ch18.html
>
>  
>
> > hence 
> > my obvious 
> > mistake of just trying to use them, I do however love the way 
> > GTKMM does 
> > a lot of things better than QT, oh well, right thanks again for the 
> > advice, I should now be able to continue my projects (Gnome 
> > Easy CD -- 
> > website and source tree coming soonish, Groupmage - native 
> > linux client 
> > for Groupwise -- even though I use sun JDS, Fedora and Debian lol, -- 
> > GnomeEasyInstall and GnomeAutoCD) hmm :-D
> >    
>
> Murray Cumming
> www.murrayc.com
> murrayc usa net
>
>
>  
True, that it is basic c++, how silly of me, I think being forced to 
write software with .Net and C# has clouded my brain lol, this is the 
first C++ code I have written in about 4 or 5 months so it will be a 
couple more days until I am back in the loop again ;)

----
The only problem with being a proffesional developer (completely self 
taught!) is that I need to program in more languages than anyone else to 
stay at the top of my game and beat the boys with degrees in Computer 
Science, Math and Software Eng.