Re: [gnome-db] gda-decl.h

[Murray Cumming <murrayc murrayc com>]

On Thu, 2006-11-30 at 15:24 +0100, Vivien Malerba wrote:
> On 11/30/06, Murray Cumming <murrayc murrayc com> wrote:
> > On Thu, 2006-11-30 at 14:51 +0100, Vivien Malerba wrote:
> > > On 11/30/06, Murray Cumming <murrayc murrayc com> wrote:
> > > > Why on earth are all the struct prototype declarations in gda-decl.h
> > > > instead of the headers of their classes?
> > >
> > > To make it easy for the header files inclusion for example when A.h
> > > needs some declaration in B.h and B.h needs some which is A.h (I don't
> > > have any precise example at hand but there must be some).
> >
> > In this case (circular includes), the prototype declaration for A or B
> > should just be repeated.
> >
> > I'm going to put these prototypes declarations in their normal places,
> > if you don't object. If it builds while doing this normally, then I will
> > have proved that it's not necessary.
> >
> 
> Ok, great!

Oh, well, I proved me wrong.

In C++, you can (and should) repeat the
  typedef struct _Something Something 
declarations instead of including the full header.

But C doesn't like that. It complains about duplicate declarations.

Using a common header is effectively the same thing with one difference:
You can use a header guard to prevent duplicate declarations.

-- 
Murray Cumming
murrayc murrayc com
www.murrayc.com
www.openismus.com