[vtkusers] Forward declarations

[Mathieu Malaterre]

Rubert,
	There is no magic behind, I swear !
	You can have a look at:

http://public.kitware.com/cgi-bin/cvsweb.cgi/VTK/Imaging/vtkImageGradient.cxx?cvsroot=VTK&sortby=date

You'll see that the last comment is:
"Add missing includes"

Maybe you can have a look.
Anyway gcc output is rather comprehensible -compared to a certain 
proprietary compiler- so that you'll be able to fix everything in 2s.

HTH
mathieu

Rupert Shute wrote:
> Hi,
> I am in the process of porting my vtk4.0 code to 4.2. However I get lots of
> complaints from the compiler about 'Forward declarations' of classes.
> Can any body shed any light on why I get these errors when I build my code,
> but not when I build the VTK source.
> I'm building on a Linux system using gcc.
> 
> Many thanks
> 
> Rupert
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Mathieu Malaterre
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