<div dir="ltr"><div dir="ltr">On Mon, Apr 1, 2019 at 9:12 PM Boris Boutkov via petsc-dev <<a href="mailto:petsc-dev@mcs.anl.gov">petsc-dev@mcs.anl.gov</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<p>Hello all,</p>
<p>I've been working on the libMesh - PETSc interface for utilizing
gmg/fieldsplit on the command line by creating DMShells; things
are seemingly in pretty good shape at this point, so thanks much
for the support along the way!</p>
<p>The last lingering issue of the implementation is that I still
have a little bit of dependency on <span class="gmail-m_-4051634772101327645pl-s">PETSc
private/dmimpl.h. In short, during our implementation of
DMCreateSubDM I try and get some of the parent DMs function
pointers, specifically dm->ops->{</span><span class="gmail-m_-4051634772101327645pl-s"><span class="gmail-m_-4051634772101327645pl-smi">coarsen, </span></span><span class="gmail-m_-4051634772101327645pl-smi">refine,
</span><span class="gmail-m_-4051634772101327645pl-smi">createinterpolation, </span><span class="gmail-m_-4051634772101327645pl-smi">createrestriction,</span><span class="gmail-m_-4051634772101327645pl-smi">
and createsubdm</span>}, which then I set for the subDM using
DMShellSet* by passing in the parent DM pointer directly.<br>
</p>
<p>I'd like to remove this private dmimpl.h dependency but removing
the header gives me compilation errors - "invalid use of
incomplete type" pointing to PETsc DM struct for the above calls.
As far as I understand it, this means that I would need public API
similar to the DMShellSet* methods but now instead DMShellGet*.</p>
<p> If the above's the case, any reason this doesn't exist yet
outside of lack of prior need? And how much work would introducing
this require? Or of course please let me know if there's some
simple way around this that I may be missing.</p></div></blockquote><div>No, we just needed someone to ask. We will do this exactly like we do MATSHELL. We have to create an Enum that indexes</div><div>the DM methods. Then you can pass the Enum value when you Set/Get the methods. Its not hard, just some coding. Want to try :)</div><div><br></div><div> Thanks,</div><div><br></div><div> Matt</div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div bgcolor="#FFFFFF">
<p>Thanks as always for your time,</p>
<p>- Boris<br>
</p>
<p><br>
</p>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div>What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>-- Norbert Wiener</div><div><br></div><div><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br></div></div></div></div></div></div></div></div>