Re: [petsc-users] pass a member function to MatShellSetOperation

I have used something like this in similar situation auto MatMult = [this](…args…) { this->MyMatMult(…args…); }; Then pass MatMult to petsc. this refers to the class Global_Assem and we are assuming you are inside this class when doing the above. best praveen

On 30-Sep-2021, at 3:25 PM, Michael Wick <[email protected]> wrote:

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