2: #include <petsc-private/matimpl.h>        /*I "petscmat.h" I*/
  3: 
  6: /*@
  7:     MatHasOperation - Determines whether the given matrix supports the particular
  8:     operation.

 10:    Not Collective

 12:    Input Parameters:
 13: +  mat - the matrix
 14: -  op - the operation, for example, MATOP_GET_DIAGONAL

 16:    Output Parameter:
 17: .  has - either PETSC_TRUE or PETSC_FALSE

 19:    Level: advanced

 21:    Notes:
 22:    See the file include/petscmat.h for a complete list of matrix
 23:    operations, which all have the form MATOP_<OPERATION>, where
 24:    <OPERATION> is the name (in all capital letters) of the
 25:    user-level routine.  E.g., MatNorm() -> MATOP_NORM.

 27: .keywords: matrix, has, operation

 29: .seealso: MatCreateShell()
 30: @*/
 31: PetscErrorCode  MatHasOperation(Mat mat,MatOperation op,PetscBool  *has)
 32: {
 37:   if (((void **)mat->ops)[op]) {*has =  PETSC_TRUE;}
 38:   else {
 39:     if (op == MATOP_GET_SUBMATRIX) {
 41:       PetscMPIInt    size;

 43:       MPI_Comm_size(((PetscObject)mat)->comm,&size);
 44:       if (size == 1) {
 45:         MatHasOperation(mat,MATOP_GET_SUBMATRICES,has);
 46:       } else {
 47:         *has = PETSC_FALSE;
 48:       }
 49:     } else {
 50:       *has = PETSC_FALSE;
 51:     }
 52:   }
 53:   return(0);
 54: }