[petsc-users] problem with MatShellGetContext

[Jed Brown]

Matthew Knepley <knepley at gmail.com> writes:
> Yes, you are passing a C++ function userMult, so the compiler sticks "this"
> in as the first argument. We do not
> recommend this kind of wrapping.

I.e., either make it a stand-alone function or make the class function static.
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