message: Use nullptr instead of NULL in LOR classes
diff: @@ -91,7 +91,7 @@ void LORBase::ConstructLocalDofPermutation(Array<int> &perm_) const
  {
  const FiniteElement *fe = fes.GetFE(i);
  auto tfe = dynamic_cast<const TensorBasisElement*>(fe);
  - MFEM_ASSERT(tfe != NULL, "");
  + MFEM_ASSERT(tfe != nullptr, "");
  return tfe->GetDofMap();
  };
  @@ -265,7 +265,7 @@ bool LORBase::HasSameDofNumbering() const
  const OperatorHandle &LORBase::GetAssembledSystem() const
  {
  - MFEM_VERIFY(a != NULL && A.Ptr() != NULL, "No LOR system assembled");
  + MFEM_VERIFY(a != nullptr && A.Ptr() != nullptr, "No LOR system assembled");
  return A;
  }
  @@ -302,7 +302,7 @@ void LORBase::SetupProlongationAndRestriction()
  }
  else
  {
  - fes->CopyProlongationAndRestriction(fes_ho, NULL);
  + fes->CopyProlongationAndRestriction(fes_ho, nullptr);
  }
  }
  @@ -367,10 +367,10 @@ LORBase::LORBase(FiniteElementSpace &fes_ho_)
  }
  else
  {
  - ir_el = NULL;
  - ir_face = NULL;
  + ir_el = nullptr;
  + ir_face = nullptr;
  }
  - a = NULL;
  + a = nullptr;
  }
  LORBase::~LORBase()
  @@ -422,7 +422,7 @@ void LORDiscretization::AssembleSystem(BilinearForm &a_ho,
  SparseMatrix &LORDiscretization::GetAssembledMatrix() const
  {
  - MFEM_VERIFY(a != NULL && A.Ptr() != NULL, "No LOR system assembled");
  + MFEM_VERIFY(a != nullptr && A.Ptr() != nullptr, "No LOR system assembled");
  return *A.As<SparseMatrix>();
  }
  @@ -469,7 +469,7 @@ void ParLORDiscretization::AssembleSystem(ParBilinearForm &a_ho,
  HypreParMatrix &ParLORDiscretization::GetAssembledMatrix() const
  {
  - MFEM_VERIFY(a != NULL && A.Ptr() != NULL, "No LOR system assembled");
  + MFEM_VERIFY(a != nullptr && A.Ptr() != nullptr, "No LOR system assembled");
  return *A.As<HypreParMatrix>();
  }
  