Daniel
Thanks for reply. You seem to know your stuff.
If pointers are more complicated and unnecessary sometimes,
then why does GTK+ have so many pointers?
Why are many things of GtkWidget* type and not GtkWidget?
It seems like GdkColor is the first widget I found that
is not declared to be a pointer in sample code I found.
If this structures elements were *not* integers than then
suggested initialization "= {0, 0, 0, 0}" would not work right?
I'd have to replace those 4 zeroes with whatever type the struc
held right?
Thanks,
Chris
On Mon, Apr 22, 2002 at 09:36:29PM +0200, Daniel Elstner wrote:
> Am Mon, 2002-04-22 um 21.22 schrieb [EMAIL PROTECTED]:
> > From: Christian Seberino <[EMAIL PROTECTED]>
> > >
> > > Thanks so much for this reply! I was really confused
> > > about this! Can I ask you a follow up question?
> > >
> > > Just to make GdkColor be like everything else (a pointer)
> > > is it OK to try declaring all colors to be pointer (GdkColor*) types???
>
> Since when is everything else a pointer? Don't use pointers if you
> don't have to.
>
> > > Then instead of:
> > > Colors::myStaticColor.red = 343;
> > >
> > > I could hopefully do:
> > > (*Colors::myStaticColor).red = 343;
> > >
> > > or even better, Colors::myStaticColor->red = 343;
> > >
> > > Hopefully I can then initialize things to make them look more like a class:
> > >
> > > GdkColor* Colors::myStaticColor = (GdkColor*) 0;
>
> You're confusing something. A class can be created on stack, as well as
> allocated in free storage / heap.
>
> > This'll get you a nice seg fault.
> >
> > You're declaring a pointer, but not allocating any memory.
>
> Yes. And there's no reason to make your life harder just for the sake
> of having a pointer.
>
> > > Is there any reason this fantasy should not work??? I tried last nite
> > > and got seg faults so I don't know if this is not doable or I just
> > > made a dumb mistake. As you said, GdkColor is a "extern C struc". I'm not
> > > a "extern C struc" expert. :(
>
> Forget that rubbish. There's no 'extern "C" struct'. extern "C" does
> nothing but specify the C linkage convention for functions -- don't
> worry if you don't understand this yet.
>
> > Go look at any basic C language reference (not C++).
>
> Any good C++ book will help you as well. C++ is mostly compatible to C,
> except for some obscure features that are deprecated in C too. If it
> weren't compatible, you wouldn't even be able to include GTK+ headers in
> your program.
>
> --Daniel
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