PCShell interface

[Jed Brown]

Matthew Knepley wrote:
> On Wed, Jun 10, 2009 at 11:33 AM, Jed Brown <jed at 59a2.org> wrote:
> 
>> Barry Smith wrote:
>>>    Go ahead. This has been on the todo list for a decade.
>> I see two ways to do it.  One is to define a PCOperation enum and have
>> PCShellSetOperation (analogous to MatShell), the other is to just update
>> the current interface for void* -> PC.  The former results in less code
>> (though more changes today), but the latter offers stronger type
>> checking and is not outrageously bloated because the PC interface is
>> pretty small.  What is your preference?
> 
> 
> I like the latter.  I never liked the enums, but Mat has so many operations.

Good, I definitely like the type safety.

I pushed this change.  I think the fortran stub for PCShellSetContext
can now be auto-generated, but I didn't do that (is it just removing the
C from /*@C or is there another step, I hadn't looked at how Fortran
stubs are done until now).

snes/examples/tutorials/ex33f.F needs some extra files to build and I
haven't written another example to confirm that PCShellGetContext
actually works so it would be great if someone could check the Fortran
stubs.

Jed

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