[petsc-users] How to use class function in SNESSetFunction

[Ping He]

Dear Matt,

I know it is an old thread and your solution works well, but I still 
want to ask if there are any alternative instead of setting the member 
function "static". The issue is that I need to use multiple member 
functions (20+) in SNESSetFunction and numerous class variables. So 
changing all of them to static will need quite a lot of code/structure 
change. Thanks very much in advance.

Regards,
Ping