[petsc-users] pass a member function to MatShellSetOperation

[Michael Wick]

Hi:

I want to have the shell matrix-vector multiplication written as a class
member function and pass it to the shell matrix via MatShellSetOperation.

MatShellSetOperation(A, MATOP_MULT, (void
(*)(void))(&Global_Assem::MyMatMult));

Perhaps I have a wrong understanding of function pointers, and I am
constantly getting warnings that say I cannot convert a member function to
a void type. The warning indeed makes sense to me, as the function pointer
passed in the above manner is independent of an instance. Perhaps there are
other ways of passing a member function that I don't know of. If you know
how to address this, I would appreciate it a lot!

Thanks,

Mike
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