[petsc-dev] http://www.c-faq.com/aryptr/non0based.html

[Barry Smith]

    What do the PETSc developers think of this? Is it "otherwise, the  
behavior is undefined, even if the pointer is not dereferenced."?

    Whenever we work with global indices like  in FormFunctionLocal()  
we do this.

     Is PETSc wrong to ever do this? Is there any other way to allow  
users to work with global indices in a simple way? Do we need to strip  
out all the FormFunctionLocals() from PETSc? Not the end of the world  
but it provides such a nice simple interface for simple problems it  
seems a pity to toss it.

    Thanks

    Barry

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