int HYPRE_StructPCGSetPrecond

(HYPRE_StructSolver solver,
  HYPRE_PtrToStructSolverFcn precond,
  HYPRE_PtrToStructSolverFcn precond_setup,
  HYPRE_StructSolver precond_solver)

(Optional) Set the preconditioner to use

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(Optional) Set the preconditioner to use

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