1: #define PETSC_DLL
  2: /*
  3:      Provides utility routines for manulating any type of PETSc object.
  4: */
 5:  #include petsc.h

  9: /*@C
 10:    PetscObjectGetComm - Gets the MPI communicator for any PetscObject, 
 11:    regardless of the type.

 13:    Not Collective

 15:    Input Parameter:
 16: .  obj - any PETSc object, for example a Vec, Mat or KSP. Thus must be
 17:          cast with a (PetscObject), for example, 
 18:          PetscObjectGetComm((PetscObject)mat,&comm);

 20:    Output Parameter:
 21: .  comm - the MPI communicator

 23:    Level: advanced

 25:    Concepts: communicator^getting from object
 26:    Concepts: MPI communicator^getting from object

 28: @*/
 29: PetscErrorCode  PetscObjectGetComm(PetscObject obj,MPI_Comm *comm)
 30: {

 34:   if (!obj) SETERRQ(PETSC_ERR_ARG_CORRUPT,"Null object");
 35:   if (obj->bops->getcomm) {
 36:     obj->bops->getcomm(obj,comm);
 37:   } else {
 38:     *comm = obj->comm;
 39:   }
 40:   return(0);
 41: }