rstein
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???
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;
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. :(
Sincerely,
Chris
On Mon, Apr 22, 2002 at 10:53:35AM -0700, [EMAIL PROTECTED] wrote:
> > From: Christian Seberino <[EMAIL PROTECTED]>
> >
> > I've seen examples in GTK+ books where GdkColor widgets
> > are not declared to be pointers (GdkColor* myColor;)
> > but instead declared like this... (GdkColor myColor;)
> >
> > I don't know if this begins to explain g++ not liking
> > this initialization or not....
> >
> > GdkColor Color:myStaticColor = (GdkColor 0); // *won't work!!*
> >
> > *only* this works...
> >
> > GdkColor Color:myStaticColor = {0}; // *won't work!!*
> >
> > Is GdkColor some weird type or something?? Do you
> > know why {0} works but not "(GdkColor) 0"???
>
> (GdkColor) 0 doesn't work because it's not a pointer.
>
> It really an extern "C" struct with four members.
> Since it's extern "C", you need to initialize it
> in the proper C (_not_ C++) way. For a struct in C,
> you provide an initialization list for the members,
> e.g.
>
> GdkColor color = {0, 0, 0, 0};
>
> If you provide fewer initializers than there are members,
> the last initializer is used to initialize all remaining
> members, so
>
> GdkColor color = {0};
>
> is equivalent.
>
> Just because you're initializing GdkColor in C++ doesn't
> mean you can treat it like a C++ class. It's still a
> C struct.
>
> Ron Steinke
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