[petsc-dev] Make PetscHash publicly accessible

Jed Brown jed at jedbrown.org
Fri Apr 22 09:04:37 CDT 2016

Matthew Knepley <knepley at gmail.com> writes:

> On Fri, Apr 22, 2016 at 4:32 AM, Lawrence Mitchell <
> lawrence.mitchell at imperial.ac.uk> wrote:
>> Hi all,
>> I would like to use the PetscHash functionality in my code.  At the moment
>> this is not possible, since the header file hash.h is not public (it's in
>> src/sys/utils/hash.h).  Would there be any objections to moving it to (say)
>> include/petschash.h so that PETSc applications can use it as well as PETSc
>> itself.
> No, go ahead and do it.

If you do, then you need to namespace everything so it doesn't conflict
with khash.h from:

  (or https://github.com/clibs/hash)

Now personally, if I was writing code that was not intended for eventual
inclusion in PETSc, I would just use upstream khash.h directly.  (PETSc
should probably upgrade to the latest upstream khash.h.)

The PetscHash* wrappers don't add value in my opinion, just consistency
with PETSc style via lots of lines of code that add PetscErrorCode
returns that cannot be anything but 0 because the underlying operations
cannot fail.
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