[petsc-dev] PCGAMG: set default type (AGG); PCSetUp_GAMG crashes if not set

[Jed Brown]

Matthew Knepley <knepley at gmail.com> writes:
> The only confusing thing I see is if we wanted them not set back to
> NULL, but to a "default" function. I think we should outlaw that.

If an implementation wants to implement a function, XXCreate_YY needs to
ask for it.  If we have a problem with too much repetition of
"defaults", it XXCreate_YY can call a function that batches them
together.  I don't see any reason to leave side-effects from an earlier
type.
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