[petsc-dev] Forward declarations of types?

[Jed Brown]

On Fri, Feb 15, 2013 at 3:38 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

>
> Heh, I thought I remembered that duplicate typedefs were invalid in C, but
> gcc happily compiled it without a warning. In fact, they _are_ allowed in
> C11, but not in our old, crusty version of C.
>

>From the looks of it, the C forum never explicitly intended for it to be
invalid, but as a consequence of the classification of typedef in C
(typedef is classified differently in C++), it would have needed to be
explicitly allowed. C11 added that clause.

http://stackoverflow.com/a/8595191/33208
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