18   PetscErrorCode (*presolve)(PC, KSP, Vec, Vec);  member
186 …PetscCheck(shell->presolve, PetscObjectComm((PetscObject)pc), PETSC_ERR_USER, "No presolve() routi…  in PCPreSolve_Shell()
187   PetscCallBack("PCSHELL callback presolve", (*shell->presolve)(pc, ksp, b, x));  in PCPreSolve_Shell()
361 static PetscErrorCode PCShellSetPreSolve_Shell(PC pc, PCShellPSolveFn *presolve)  in PCShellSetPreSolve_Shell()  argument
366   shell->presolve = presolve;  in PCShellSetPreSolve_Shell()
367   if (presolve) {  in PCShellSetPreSolve_Shell()
368     pc->ops->presolve = PCPreSolve_Shell;  in PCShellSetPreSolve_Shell()
371     pc->ops->presolve = NULL;  in PCShellSetPreSolve_Shell()
752 PetscErrorCode PCShellSetPreSolve(PC pc, PCShellPSolveFn *presolve)  in PCShellSetPreSolve()  argument
756   PetscTryMethod(pc, "PCShellSetPreSolve_C", (PC, PCShellPSolveFn *), (pc, presolve));  in PCShellSetPreSolve()
932   pc->ops->presolve            = NULL;  in PCCreate_Shell()
939   shell->presolve            = NULL;  in PCCreate_Shell()