From: ageay <ageay>
Date: Thu, 4 Apr 2013 07:49:06 +0000 (+0000)
Subject: Protections on Fields against null pointers
X-Git-Tag: V6_main_FINAL~211
X-Git-Url: http://git.salome-platform.org/gitweb/?a=commitdiff_plain;h=6178737095518f83b5125a610e091a841d4a5a11;p=tools%2Fmedcoupling.git

Protections on Fields against null pointers
---

diff --git a/src/MEDCoupling/MEDCouplingField.cxx b/src/MEDCoupling/MEDCouplingField.cxx
index 12c7138fd..4f3fc3e56 100644
--- a/src/MEDCoupling/MEDCouplingField.cxx
+++ b/src/MEDCoupling/MEDCouplingField.cxx
@@ -77,6 +77,10 @@ bool MEDCouplingField::isEqual(const MEDCouplingField *other, double meshPrec, d
 
 bool MEDCouplingField::isEqualWithoutConsideringStr(const MEDCouplingField *other, double meshPrec, double valsPrec) const
 {
+  if(!other)
+    throw INTERP_KERNEL::Exception("MEDCouplingField::isEqualWithoutConsideringStr : input field is NULL !");
+  if(!_type)
+    throw INTERP_KERNEL::Exception("MEDCouplingField::isEqualWithoutConsideringStr : spatial discretization of this is NULL !");
   if(!_type->isEqualWithoutConsideringStr(other->_type,valsPrec))
     return false;
   if(_nature!=other->_nature)
@@ -97,6 +101,8 @@ bool MEDCouplingField::isEqualWithoutConsideringStr(const MEDCouplingField *othe
  */
 bool MEDCouplingField::areCompatibleForMerge(const MEDCouplingField *other) const
 {
+  if(!other)
+    throw INTERP_KERNEL::Exception("MEDCouplingField::areCompatibleForMerge : input field is NULL !");
   if(!_type->isEqual(other->_type,1.))
     return false;
   if(_nature!=other->_nature)
@@ -112,6 +118,8 @@ bool MEDCouplingField::areCompatibleForMerge(const MEDCouplingField *other) cons
  */
 bool MEDCouplingField::areStrictlyCompatible(const MEDCouplingField *other) const
 {
+  if(!other)
+    throw INTERP_KERNEL::Exception("MEDCouplingField::areStrictlyCompatible : input field is NULL !");
   if(!_type->isEqual(other->_type,1.e-12))
     return false;
   if(_nature!=other->_nature)
@@ -161,6 +169,7 @@ NatureOfField MEDCouplingField::getNature() const
  */
 void MEDCouplingField::setNature(NatureOfField nat) throw(INTERP_KERNEL::Exception)
 {
+  MEDCouplingNatureOfField::GetRepr(nat);//generate a throw if nat not recognized
   _nature=nat;
 }
 
@@ -174,6 +183,8 @@ DataArrayDouble *MEDCouplingField::getLocalizationOfDiscr() const throw(INTERP_K
 {
   if(!_mesh)
     throw INTERP_KERNEL::Exception("MEDCouplingField::getLocalizationOfDiscr : No mesh set !");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("MEDCouplingField::getLocalizationOfDiscr : No spatial discretization set !");
   return _type->getLocalizationOfDiscValues(_mesh);
 }
 
@@ -183,8 +194,10 @@ DataArrayDouble *MEDCouplingField::getLocalizationOfDiscr() const throw(INTERP_K
  */
 MEDCouplingFieldDouble *MEDCouplingField::buildMeasureField(bool isAbs) const throw(INTERP_KERNEL::Exception)
 {
-  if(_mesh==0)
-    throw INTERP_KERNEL::Exception("MEDCouplingField::getMeasureField : no mesh defined !!!");
+  if(!_mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingField::buildMeasureField : no mesh defined !");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("MEDCouplingField::buildMeasureField : No spatial discretization set !");
   return _type->getMeasureField(_mesh,isAbs);
 }
 
@@ -217,6 +230,8 @@ void MEDCouplingField::setGaussLocalizationOnType(INTERP_KERNEL::NormalizedCellT
 {
   if(!_mesh)
     throw INTERP_KERNEL::Exception("Mesh has to be set before calling setGaussLocalizationOnType method !");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("Spatial discretization not set ! Impossible to call setGaussLocalizationOnType method !");
   _type->setGaussLocalizationOnType(_mesh,type,refCoo,gsCoo,wg);
 }
 
@@ -235,6 +250,8 @@ void MEDCouplingField::setGaussLocalizationOnCells(const int *begin, const int *
 {
   if(!_mesh)
     throw INTERP_KERNEL::Exception("Mesh has to be set before calling setGaussLocalizationOnCells method !");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("Spatial discretization not set ! Impossible to call setGaussLocalizationOnCells method !");
   _type->setGaussLocalizationOnCells(_mesh,begin,end,refCoo,gsCoo,wg);
 }
 
@@ -245,6 +262,8 @@ void MEDCouplingField::clearGaussLocalizations()
 {
   if(!_mesh)
     throw INTERP_KERNEL::Exception("Mesh has to be set before calling clearGaussLocalizations method !");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("Spatial discretization not set ! Impossible to call clearGaussLocalizations method !");
   _type->clearGaussLocalizations();
 }
 
@@ -258,6 +277,8 @@ MEDCouplingGaussLocalization& MEDCouplingField::getGaussLocalization(int locId)
 {
   if(!_mesh)
     throw INTERP_KERNEL::Exception("Mesh has to be set before calling getGaussLocalization method !");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("Spatial discretization not set ! Impossible to call getGaussLocalization method !");
   return _type->getGaussLocalization(locId);
 }
 
@@ -270,6 +291,8 @@ int MEDCouplingField::getGaussLocalizationIdOfOneType(INTERP_KERNEL::NormalizedC
 {
   if(!_mesh)
     throw INTERP_KERNEL::Exception("Mesh has to be set before calling getGaussLocalizationIdOfOneType method !");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("Spatial discretization not set ! Impossible to call getGaussLocalizationIdOfOneType method !");
   return _type->getGaussLocalizationIdOfOneType(type);
 }
 
@@ -277,6 +300,8 @@ std::set<int> MEDCouplingField::getGaussLocalizationIdsOfOneType(INTERP_KERNEL::
 {
   if(!_mesh)
     throw INTERP_KERNEL::Exception("Mesh has to be set before calling getGaussLocalizationIdsOfOneType method !");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("Spatial discretization not set ! Impossible to call getGaussLocalizationIdsOfOneType method !");
   return _type->getGaussLocalizationIdsOfOneType(type);
 }
 
@@ -288,6 +313,8 @@ int MEDCouplingField::getNbOfGaussLocalization() const throw(INTERP_KERNEL::Exce
 {
   if(!_mesh)
     throw INTERP_KERNEL::Exception("Mesh has to be set before calling getNbOfGaussLocalization method !");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("Spatial discretization not set ! Impossible to call getNbOfGaussLocalization method !");
   return _type->getNbOfGaussLocalization();
 }
 
@@ -300,6 +327,8 @@ int MEDCouplingField::getGaussLocalizationIdOfOneCell(int cellId) const throw(IN
 {
   if(!_mesh)
     throw INTERP_KERNEL::Exception("Mesh has to be set before calling getGaussLocalizationIdOfOneCell method !");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("Spatial discretization not set ! Impossible to call getGaussLocalizationIdOfOneCell method !");
   return _type->getGaussLocalizationIdOfOneCell(cellId);
 }
 
@@ -315,6 +344,8 @@ void MEDCouplingField::getCellIdsHavingGaussLocalization(int locId, std::vector<
   cellIds.clear();
   if(!_mesh)
     throw INTERP_KERNEL::Exception("Mesh has to be set before calling getGaussLocalizationIdOfOneCell method !");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("Spatial discretization not set ! Impossible to call getCellIdsHavingGaussLocalization method !");
   _type->getCellIdsHavingGaussLocalization(locId,cellIds);
 }
 
@@ -328,6 +359,8 @@ const MEDCouplingGaussLocalization& MEDCouplingField::getGaussLocalization(int l
 {
   if(!_mesh)
     throw INTERP_KERNEL::Exception("Mesh has to be set before calling getGaussLocalization method !");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("Spatial discretization not set ! Impossible to call getGaussLocalization method !");
   return _type->getGaussLocalization(locId);
 }
 
@@ -365,6 +398,8 @@ MEDCouplingField::MEDCouplingField(const MEDCouplingField& other, bool deepCopy)
  */
 MEDCouplingMesh *MEDCouplingField::buildSubMeshData(const int *start, const int *end, DataArrayInt *&di) const
 {
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("Spatial discretization not set ! Impossible to call buildSubMeshData method !");
   return _type->buildSubMeshData(_mesh,start,end,di);
 }
 
@@ -374,6 +409,8 @@ MEDCouplingMesh *MEDCouplingField::buildSubMeshData(const int *start, const int
  */
 DataArrayInt *MEDCouplingField::computeTupleIdsToSelectFromCellIds(const int *startCellIds, const int *endCellIds) const
 {
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("Spatial discretization not set ! Impossible to call computeTupleIdsToSelectFromCellIds method !");
   return _type->computeTupleIdsToSelectFromCellIds(_mesh,startCellIds,endCellIds);
 }
 
@@ -383,6 +420,8 @@ DataArrayInt *MEDCouplingField::computeTupleIdsToSelectFromCellIds(const int *st
  */
 int MEDCouplingField::getNumberOfTuplesExpected() const throw(INTERP_KERNEL::Exception)
 {
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("Spatial discretization not set ! Impossible to call getNumberOfTuplesExpected method !");
   if(_mesh)
     return _type->getNumberOfTuples(_mesh);
   else
@@ -391,9 +430,12 @@ int MEDCouplingField::getNumberOfTuplesExpected() const throw(INTERP_KERNEL::Exc
 
 void MEDCouplingField::setDiscretization(MEDCouplingFieldDiscretization *newDisc)
 {
+  bool needUpdate=(const MEDCouplingFieldDiscretization *)_type!=newDisc;
   _type=newDisc;
   if(newDisc)
     newDisc->incrRef();
+  if(needUpdate)
+    declareAsNew();
 }
 
 /*!
@@ -402,6 +444,8 @@ void MEDCouplingField::setDiscretization(MEDCouplingFieldDiscretization *newDisc
  */
 int MEDCouplingField::getNumberOfMeshPlacesExpected() const throw(INTERP_KERNEL::Exception)
 {
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("Spatial discretization not set ! Impossible to call getNumberOfMeshPlacesExpected method !");
   if(_mesh)
     return _type->getNumberOfMeshPlaces(_mesh);
   else
diff --git a/src/MEDCoupling/MEDCouplingFieldDiscretization.cxx b/src/MEDCoupling/MEDCouplingFieldDiscretization.cxx
index 297a8de77..1180cf43c 100644
--- a/src/MEDCoupling/MEDCouplingFieldDiscretization.cxx
+++ b/src/MEDCoupling/MEDCouplingFieldDiscretization.cxx
@@ -434,6 +434,11 @@ const char *MEDCouplingFieldDiscretizationP0::getRepr() const
 
 bool MEDCouplingFieldDiscretizationP0::isEqualIfNotWhy(const MEDCouplingFieldDiscretization *other, double eps, std::string& reason) const
 {
+  if(!other)
+    {
+      reason="other spatial discretization is NULL, and this spatial discretization (P0) is defined.";
+      return false;
+    }
   const MEDCouplingFieldDiscretizationP0 *otherC=dynamic_cast<const MEDCouplingFieldDiscretizationP0 *>(other);
   bool ret=otherC!=0;
   if(!ret)
@@ -443,16 +448,22 @@ bool MEDCouplingFieldDiscretizationP0::isEqualIfNotWhy(const MEDCouplingFieldDis
 
 int MEDCouplingFieldDiscretizationP0::getNumberOfTuples(const MEDCouplingMesh *mesh) const throw(INTERP_KERNEL::Exception)
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationP0::getNumberOfTuples : NULL input mesh !");
   return mesh->getNumberOfCells();
 }
 
 int MEDCouplingFieldDiscretizationP0::getNumberOfMeshPlaces(const MEDCouplingMesh *mesh) const
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationP0::getNumberOfMeshPlaces : NULL input mesh !");
   return mesh->getNumberOfCells();
 }
 
 DataArrayInt *MEDCouplingFieldDiscretizationP0::getOffsetArr(const MEDCouplingMesh *mesh) const
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationP0::getOffsetArr : NULL input mesh !");
   int nbOfTuples=mesh->getNumberOfCells();
   DataArrayInt *ret=DataArrayInt::New();
   ret->alloc(nbOfTuples+1,1);
@@ -463,6 +474,8 @@ DataArrayInt *MEDCouplingFieldDiscretizationP0::getOffsetArr(const MEDCouplingMe
 void MEDCouplingFieldDiscretizationP0::renumberArraysForCell(const MEDCouplingMesh *mesh, const std::vector<DataArrayDouble *>& arrays,
                                                              const int *old2NewBg, bool check) throw(INTERP_KERNEL::Exception)
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationP0::renumberArraysForCell : NULL input mesh !");
   const int *array=old2NewBg;
   if(check)
     array=DataArrayInt::CheckAndPreparePermutation(old2NewBg,old2NewBg+mesh->getNumberOfCells());
@@ -477,6 +490,8 @@ void MEDCouplingFieldDiscretizationP0::renumberArraysForCell(const MEDCouplingMe
 
 DataArrayDouble *MEDCouplingFieldDiscretizationP0::getLocalizationOfDiscValues(const MEDCouplingMesh *mesh) const
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationP0::getLocalizationOfDiscValues : NULL input mesh !");
   return mesh->getBarycenterAndOwner();
 }
 
@@ -504,6 +519,8 @@ void MEDCouplingFieldDiscretizationP0::checkCompatibilityWithNature(NatureOfFiel
 
 void MEDCouplingFieldDiscretizationP0::checkCoherencyBetween(const MEDCouplingMesh *mesh, const DataArrayDouble *da) const throw(INTERP_KERNEL::Exception)
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationP0::checkCoherencyBetween : NULL input mesh !");
   if(mesh->getNumberOfCells()!=da->getNumberOfTuples())
     {
       std::ostringstream message;
@@ -522,6 +539,8 @@ MEDCouplingFieldDouble *MEDCouplingFieldDiscretizationP0::getMeasureField(const
 
 void MEDCouplingFieldDiscretizationP0::getValueOn(const DataArrayDouble *arr, const MEDCouplingMesh *mesh, const double *loc, double *res) const
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationP0::getValueOn : NULL input mesh !");
   int id=mesh->getCellContainingPoint(loc,_precision);
   if(id==-1)
     throw INTERP_KERNEL::Exception("Specified point is detected outside of mesh : unable to apply P0::getValueOn !");
@@ -539,6 +558,8 @@ void MEDCouplingFieldDiscretizationP0::getValueOnPos(const DataArrayDouble *arr,
 
 DataArrayDouble *MEDCouplingFieldDiscretizationP0::getValueOnMulti(const DataArrayDouble *arr, const MEDCouplingMesh *mesh, const double *loc, int nbOfPoints) const
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationP0::getValueOnMulti : NULL input mesh !");
   std::vector<int> elts,eltsIndex;
   mesh->getCellsContainingPoints(loc,nbOfPoints,_precision,elts,eltsIndex);
   int spaceDim=mesh->getSpaceDimension();
@@ -599,6 +620,8 @@ DataArrayInt *MEDCouplingFieldDiscretizationP0::computeTupleIdsToSelectFromCellI
  */
 MEDCouplingMesh *MEDCouplingFieldDiscretizationP0::buildSubMeshData(const MEDCouplingMesh *mesh, const int *start, const int *end, DataArrayInt *&di) const
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationP0::buildSubMeshData : NULL input mesh !");
   MEDCouplingMesh *ret=mesh->buildPart(start,end);
   di=DataArrayInt::New();
   di->alloc((int)std::distance(start,end),1);
@@ -609,11 +632,15 @@ MEDCouplingMesh *MEDCouplingFieldDiscretizationP0::buildSubMeshData(const MEDCou
 
 int MEDCouplingFieldDiscretizationOnNodes::getNumberOfTuples(const MEDCouplingMesh *mesh) const throw(INTERP_KERNEL::Exception)
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationNodes::getNumberOfTuples : NULL input mesh !");
   return mesh->getNumberOfNodes();
 }
 
 int MEDCouplingFieldDiscretizationOnNodes::getNumberOfMeshPlaces(const MEDCouplingMesh *mesh) const
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationNodes::getNumberOfMeshPlaces : NULL input mesh !");
   return mesh->getNumberOfNodes();
 }
 
@@ -627,6 +654,8 @@ void MEDCouplingFieldDiscretizationOnNodes::renumberArraysForCell(const MEDCoupl
 
 DataArrayInt *MEDCouplingFieldDiscretizationOnNodes::getOffsetArr(const MEDCouplingMesh *mesh) const
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationNodes::getOffsetArr : NULL input mesh !");
   int nbOfTuples=mesh->getNumberOfNodes();
   DataArrayInt *ret=DataArrayInt::New();
   ret->alloc(nbOfTuples+1,1);
@@ -636,6 +665,8 @@ DataArrayInt *MEDCouplingFieldDiscretizationOnNodes::getOffsetArr(const MEDCoupl
 
 DataArrayDouble *MEDCouplingFieldDiscretizationOnNodes::getLocalizationOfDiscValues(const MEDCouplingMesh *mesh) const
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationNodes::getLocalizationOfDiscValues : NULL input mesh !");
   return mesh->getCoordinatesAndOwner();
 }
 
@@ -656,6 +687,8 @@ void MEDCouplingFieldDiscretizationOnNodes::computeMeshRestrictionFromTupleIds(c
 
 void MEDCouplingFieldDiscretizationOnNodes::checkCoherencyBetween(const MEDCouplingMesh *mesh, const DataArrayDouble *da) const throw(INTERP_KERNEL::Exception)
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationNodes::checkCoherencyBetween : NULL input mesh !");
   if(mesh->getNumberOfNodes()!=da->getNumberOfTuples())
     {
       std::ostringstream message;
@@ -672,6 +705,8 @@ void MEDCouplingFieldDiscretizationOnNodes::checkCoherencyBetween(const MEDCoupl
  */
 MEDCouplingMesh *MEDCouplingFieldDiscretizationOnNodes::buildSubMeshData(const MEDCouplingMesh *mesh, const int *start, const int *end, DataArrayInt *&di) const
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationNodes::buildSubMeshData : NULL input mesh !");
   MEDCouplingMesh *ret=mesh->buildPartAndReduceNodes(start,end,di);
   DataArrayInt *di2=di->invertArrayO2N2N2O(ret->getNumberOfNodes());
   di->decrRef();
@@ -690,7 +725,7 @@ MEDCouplingMesh *MEDCouplingFieldDiscretizationOnNodes::buildSubMeshData(const M
 DataArrayInt *MEDCouplingFieldDiscretizationOnNodes::computeTupleIdsToSelectFromCellIds(const MEDCouplingMesh *mesh, const int *startCellIds, const int *endCellIds) const
 {
   if(!mesh)
-    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationP1::computeTupleIdsToSelectFromCellIds : null mesh !");
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationP1::computeTupleIdsToSelectFromCellIds : NULL input mesh !");
   const MEDCouplingAutoRefCountObjectPtr<MEDCouplingUMesh> umesh=mesh->buildUnstructured();
   MEDCouplingAutoRefCountObjectPtr<MEDCouplingUMesh> umesh2=static_cast<MEDCouplingUMesh *>(umesh->buildPartOfMySelf(startCellIds,endCellIds,true));
   return umesh2->computeFetchedNodeIds();
@@ -751,6 +786,11 @@ const char *MEDCouplingFieldDiscretizationP1::getRepr() const
 
 bool MEDCouplingFieldDiscretizationP1::isEqualIfNotWhy(const MEDCouplingFieldDiscretization *other, double eps, std::string& reason) const
 {
+  if(!other)
+    {
+      reason="other spatial discretization is NULL, and this spatial discretization (P1) is defined.";
+      return false;
+    }
   const MEDCouplingFieldDiscretizationP1 *otherC=dynamic_cast<const MEDCouplingFieldDiscretizationP1 *>(other);
   bool ret=otherC!=0;
   if(!ret)
@@ -773,6 +813,8 @@ MEDCouplingFieldDouble *MEDCouplingFieldDiscretizationP1::getMeasureField(const
 
 void MEDCouplingFieldDiscretizationP1::getValueOn(const DataArrayDouble *arr, const MEDCouplingMesh *mesh, const double *loc, double *res) const
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationP1::getValueOn : NULL input mesh !");
   int id=mesh->getCellContainingPoint(loc,_precision);
   if(id==-1)
     throw INTERP_KERNEL::Exception("Specified point is detected outside of mesh : unable to apply P1::getValueOn !");
@@ -788,6 +830,8 @@ void MEDCouplingFieldDiscretizationP1::getValueOn(const DataArrayDouble *arr, co
  */
 void MEDCouplingFieldDiscretizationP1::getValueInCell(const MEDCouplingMesh *mesh, int cellId, const DataArrayDouble *arr, const double *loc, double *res) const
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationP1::getValueInCell : NULL input mesh !");
   std::vector<int> conn;
   std::vector<double> coo;
   mesh->getNodeIdsOfCell(cellId,conn);
@@ -813,6 +857,8 @@ void MEDCouplingFieldDiscretizationP1::getValueInCell(const MEDCouplingMesh *mes
 
 DataArrayDouble *MEDCouplingFieldDiscretizationP1::getValueOnMulti(const DataArrayDouble *arr, const MEDCouplingMesh *mesh, const double *loc, int nbOfPoints) const
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationP1::getValueOnMulti : NULL input mesh !");
   std::vector<int> elts,eltsIndex;
   mesh->getCellsContainingPoints(loc,nbOfPoints,_precision,elts,eltsIndex);
   int spaceDim=mesh->getSpaceDimension();
@@ -881,6 +927,8 @@ void MEDCouplingFieldDiscretizationPerCell::checkCoherencyBetween(const MEDCoupl
 {
   if(!_discr_per_cell)
     throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationPerCell has no discretization per cell !");
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationPerCell::checkCoherencyBetween : NULL input mesh !");
   int nbOfTuples=_discr_per_cell->getNumberOfTuples();
   if(nbOfTuples!=mesh->getNumberOfCells())
     throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationPerCell has a discretization per cell but it's not matching the underlying mesh !");
@@ -888,10 +936,15 @@ void MEDCouplingFieldDiscretizationPerCell::checkCoherencyBetween(const MEDCoupl
 
 bool MEDCouplingFieldDiscretizationPerCell::isEqualIfNotWhy(const MEDCouplingFieldDiscretization *other, double eps, std::string& reason) const
 {
+  if(!other)
+    {
+      reason="other spatial discretization is NULL, and this spatial discretization (PerCell) is defined.";
+      return false;
+    }
   const MEDCouplingFieldDiscretizationPerCell *otherC=dynamic_cast<const MEDCouplingFieldDiscretizationPerCell *>(other);
   if(!otherC)
     {
-      reason="Spatial discrtization of this is ON_GAUSS, which is not the case of other.";
+      reason="Spatial discretization of this is ON_GAUSS, which is not the case of other.";
       return false;
     }
   if(_discr_per_cell==0)
@@ -935,12 +988,14 @@ void MEDCouplingFieldDiscretizationPerCell::renumberCells(const int *old2NewBg,
     delete [] const_cast<int *>(array);
 }
 
-void MEDCouplingFieldDiscretizationPerCell::buildDiscrPerCellIfNecessary(const MEDCouplingMesh *m)
+void MEDCouplingFieldDiscretizationPerCell::buildDiscrPerCellIfNecessary(const MEDCouplingMesh *mesh)
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationPerCell::buildDiscrPerCellIfNecessary : NULL input mesh !");
   if(!_discr_per_cell)
     {
       _discr_per_cell=DataArrayInt::New();
-      int nbTuples=m->getNumberOfCells();
+      int nbTuples=mesh->getNumberOfCells();
       _discr_per_cell->alloc(nbTuples,1);
       int *ptr=_discr_per_cell->getPointer();
       std::fill(ptr,ptr+nbTuples,DFT_INVALID_LOCID_VALUE);
@@ -1006,6 +1061,11 @@ TypeOfField MEDCouplingFieldDiscretizationGauss::getEnum() const
 
 bool MEDCouplingFieldDiscretizationGauss::isEqualIfNotWhy(const MEDCouplingFieldDiscretization *other, double eps, std::string& reason) const
 {
+  if(!other)
+    {
+      reason="other spatial discretization is NULL, and this spatial discretization (Gauss) is defined.";
+      return false;
+    }
   const MEDCouplingFieldDiscretizationGauss *otherC=dynamic_cast<const MEDCouplingFieldDiscretizationGauss *>(other);
   if(!otherC)
     {
@@ -1111,11 +1171,15 @@ int MEDCouplingFieldDiscretizationGauss::getNumberOfTuples(const MEDCouplingMesh
 
 int MEDCouplingFieldDiscretizationGauss::getNumberOfMeshPlaces(const MEDCouplingMesh *mesh) const
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationGauss::getNumberOfMeshPlaces : NULL input mesh !");
   return mesh->getNumberOfCells();
 }
 
 DataArrayInt *MEDCouplingFieldDiscretizationGauss::getOffsetArr(const MEDCouplingMesh *mesh) const
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationGauss::getOffsetArr : NULL input mesh !");
   int nbOfTuples=mesh->getNumberOfCells();
   MEDCouplingAutoRefCountObjectPtr<DataArrayInt> ret=DataArrayInt::New();
   ret->alloc(nbOfTuples+1,1);
@@ -1141,6 +1205,8 @@ DataArrayInt *MEDCouplingFieldDiscretizationGauss::getOffsetArr(const MEDCouplin
 void MEDCouplingFieldDiscretizationGauss::renumberArraysForCell(const MEDCouplingMesh *mesh, const std::vector<DataArrayDouble *>& arrays,
                                                                 const int *old2NewBg, bool check) throw(INTERP_KERNEL::Exception)
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationGauss::renumberArraysForCell : NULL input mesh !");
   const int *array=old2NewBg;
   if(check)
     array=DataArrayInt::CheckAndPreparePermutation(old2NewBg,old2NewBg+mesh->getNumberOfCells());
@@ -1170,6 +1236,8 @@ void MEDCouplingFieldDiscretizationGauss::renumberArraysForCell(const MEDCouplin
 
 DataArrayDouble *MEDCouplingFieldDiscretizationGauss::getLocalizationOfDiscValues(const MEDCouplingMesh *mesh) const
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationGauss::getLocalizationOfDiscValues : NULL input mesh !");
   checkNoOrphanCells();
   MEDCouplingAutoRefCountObjectPtr<MEDCouplingUMesh> umesh=mesh->buildUnstructured();//in general do nothing
   int nbOfTuples=getNumberOfTuples(mesh);
@@ -1299,6 +1367,8 @@ double MEDCouplingFieldDiscretizationGauss::getIJK(const MEDCouplingMesh *mesh,
 
 void MEDCouplingFieldDiscretizationGauss::checkCoherencyBetween(const MEDCouplingMesh *mesh, const DataArrayDouble *da) const throw(INTERP_KERNEL::Exception)
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationGauss::checkCoherencyBetween : NULL input mesh !");
   MEDCouplingFieldDiscretizationPerCell::checkCoherencyBetween(mesh,da);
   for(std::vector<MEDCouplingGaussLocalization>::const_iterator iter=_loc.begin();iter!=_loc.end();iter++)
     (*iter).checkCoherency();
@@ -1398,6 +1468,8 @@ DataArrayDouble *MEDCouplingFieldDiscretizationGauss::getValueOnMulti(const Data
 
 MEDCouplingMesh *MEDCouplingFieldDiscretizationGauss::buildSubMeshData(const MEDCouplingMesh *mesh, const int *start, const int *end, DataArrayInt *&di) const
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationGauss::buildSubMeshData : NULL input mesh !");
   di=computeTupleIdsToSelectFromCellIds(mesh,start,end);
   return mesh->buildPart(start,end);
 }
@@ -1449,41 +1521,45 @@ void MEDCouplingFieldDiscretizationGauss::renumberValuesOnCellsR(const MEDCoupli
   throw INTERP_KERNEL::Exception("Number of cells has changed and becomes higher with some cells that have been split ! Unable to conserve the Gauss field !");
 }
 
-void MEDCouplingFieldDiscretizationGauss::setGaussLocalizationOnType(const MEDCouplingMesh *m, INTERP_KERNEL::NormalizedCellType type, const std::vector<double>& refCoo,
+void MEDCouplingFieldDiscretizationGauss::setGaussLocalizationOnType(const MEDCouplingMesh *mesh, INTERP_KERNEL::NormalizedCellType type, const std::vector<double>& refCoo,
                                                                      const std::vector<double>& gsCoo, const std::vector<double>& wg) throw(INTERP_KERNEL::Exception)
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationGauss::setGaussLocalizationOnType : NULL input mesh !");
   const INTERP_KERNEL::CellModel& cm=INTERP_KERNEL::CellModel::GetCellModel(type);
-  if((int)cm.getDimension()!=m->getMeshDimension())
+  if((int)cm.getDimension()!=mesh->getMeshDimension())
     {
-      std::ostringstream oss; oss << "MEDCouplingFieldDiscretizationGauss::setGaussLocalizationOnType : mismatch of dimensions ! MeshDim==" << m->getMeshDimension();
+      std::ostringstream oss; oss << "MEDCouplingFieldDiscretizationGauss::setGaussLocalizationOnType : mismatch of dimensions ! MeshDim==" << mesh->getMeshDimension();
       oss << " whereas Type '" << cm.getRepr() << "' has dimension " << cm.getDimension() << " !";
       throw INTERP_KERNEL::Exception(oss.str().c_str());
     }
-  buildDiscrPerCellIfNecessary(m);
+  buildDiscrPerCellIfNecessary(mesh);
   int id=(int)_loc.size();
   MEDCouplingGaussLocalization elt(type,refCoo,gsCoo,wg);
   _loc.push_back(elt);
   int *ptr=_discr_per_cell->getPointer();
-  int nbCells=m->getNumberOfCells();
+  int nbCells=mesh->getNumberOfCells();
   for(int i=0;i<nbCells;i++)
-    if(m->getTypeOfCell(i)==type)
+    if(mesh->getTypeOfCell(i)==type)
       ptr[i]=id;
   zipGaussLocalizations();
 }
 
-void MEDCouplingFieldDiscretizationGauss::setGaussLocalizationOnCells(const MEDCouplingMesh *m, const int *begin, const int *end, const std::vector<double>& refCoo,
+void MEDCouplingFieldDiscretizationGauss::setGaussLocalizationOnCells(const MEDCouplingMesh *mesh, const int *begin, const int *end, const std::vector<double>& refCoo,
                                                                       const std::vector<double>& gsCoo, const std::vector<double>& wg) throw(INTERP_KERNEL::Exception)
 {
-  buildDiscrPerCellIfNecessary(m);
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationGauss::setGaussLocalizationOnCells : NULL input mesh !");
+  buildDiscrPerCellIfNecessary(mesh);
   if(std::distance(begin,end)<1)
     throw INTERP_KERNEL::Exception("Size of [begin,end) must be equal or greater than 1 !");
-  INTERP_KERNEL::NormalizedCellType type=m->getTypeOfCell(*begin);
+  INTERP_KERNEL::NormalizedCellType type=mesh->getTypeOfCell(*begin);
   MEDCouplingGaussLocalization elt(type,refCoo,gsCoo,wg);
   int id=(int)_loc.size();
   int *ptr=_discr_per_cell->getPointer();
   for(const int *w=begin+1;w!=end;w++)
     {
-      if(m->getTypeOfCell(*w)!=type)
+      if(mesh->getTypeOfCell(*w)!=type)
         {
           std::ostringstream oss; oss << "The cell with id " << *w << " has been detected to be incompatible in the [begin,end) array specified !";
           throw INTERP_KERNEL::Exception(oss.str().c_str());
@@ -1692,6 +1768,11 @@ const char *MEDCouplingFieldDiscretizationGaussNE::getRepr() const
 
 bool MEDCouplingFieldDiscretizationGaussNE::isEqualIfNotWhy(const MEDCouplingFieldDiscretization *other, double eps, std::string& reason) const
 {
+  if(!other)
+    {
+      reason="other spatial discretization is NULL, and this spatial discretization (GaussNE) is defined.";
+      return false;
+    }
   const MEDCouplingFieldDiscretizationGaussNE *otherC=dynamic_cast<const MEDCouplingFieldDiscretizationGaussNE *>(other);
   bool ret=otherC!=0;
   if(!ret)
@@ -1701,6 +1782,8 @@ bool MEDCouplingFieldDiscretizationGaussNE::isEqualIfNotWhy(const MEDCouplingFie
 
 int MEDCouplingFieldDiscretizationGaussNE::getNumberOfTuples(const MEDCouplingMesh *mesh) const throw(INTERP_KERNEL::Exception)
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationGaussNE::getNumberOfTuples : NULL input mesh !");
   int ret=0;
   int nbOfCells=mesh->getNumberOfCells();
   for(int i=0;i<nbOfCells;i++)
@@ -1716,11 +1799,15 @@ int MEDCouplingFieldDiscretizationGaussNE::getNumberOfTuples(const MEDCouplingMe
 
 int MEDCouplingFieldDiscretizationGaussNE::getNumberOfMeshPlaces(const MEDCouplingMesh *mesh) const
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationGaussNE::getNumberOfMeshPlaces : NULL input mesh !");
   return mesh->getNumberOfCells();
 }
 
 DataArrayInt *MEDCouplingFieldDiscretizationGaussNE::getOffsetArr(const MEDCouplingMesh *mesh) const
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationGaussNE::getOffsetArr : NULL input mesh !");
   int nbOfTuples=mesh->getNumberOfCells();
   DataArrayInt *ret=DataArrayInt::New();
   ret->alloc(nbOfTuples+1,1);
@@ -1740,6 +1827,8 @@ DataArrayInt *MEDCouplingFieldDiscretizationGaussNE::getOffsetArr(const MEDCoupl
 void MEDCouplingFieldDiscretizationGaussNE::renumberArraysForCell(const MEDCouplingMesh *mesh, const std::vector<DataArrayDouble *>& arrays,
                                                                   const int *old2NewBg, bool check) throw(INTERP_KERNEL::Exception)
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationGaussNE::renumberArraysForCell : NULL input mesh !");
   const int *array=old2NewBg;
   if(check)
     array=DataArrayInt::CheckAndPreparePermutation(old2NewBg,old2NewBg+mesh->getNumberOfCells());
@@ -1773,6 +1862,8 @@ void MEDCouplingFieldDiscretizationGaussNE::renumberArraysForCell(const MEDCoupl
 
 DataArrayDouble *MEDCouplingFieldDiscretizationGaussNE::getLocalizationOfDiscValues(const MEDCouplingMesh *mesh) const
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationGaussNE::getLocalizationOfDiscValues : NULL input mesh !");
   MEDCouplingAutoRefCountObjectPtr<DataArrayDouble> ret=DataArrayDouble::New();
   MEDCouplingAutoRefCountObjectPtr<MEDCouplingUMesh> umesh=mesh->buildUnstructured();//in general do nothing
   int nbOfTuples=getNumberOfTuples(umesh);
@@ -1961,6 +2052,8 @@ void MEDCouplingFieldDiscretizationGaussNE::checkCompatibilityWithNature(NatureO
 double MEDCouplingFieldDiscretizationGaussNE::getIJK(const MEDCouplingMesh *mesh, const DataArrayDouble *da,
                                                      int cellId, int nodeIdInCell, int compoId) const throw(INTERP_KERNEL::Exception)
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationGaussNE::getIJK : NULL input mesh !");
   int offset=0;
   for(int i=0;i<cellId;i++)
     {
@@ -2033,6 +2126,8 @@ DataArrayDouble *MEDCouplingFieldDiscretizationGaussNE::getValueOnMulti(const Da
 
 MEDCouplingMesh *MEDCouplingFieldDiscretizationGaussNE::buildSubMeshData(const MEDCouplingMesh *mesh, const int *start, const int *end, DataArrayInt *&di) const
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationGaussNE::buildSubMeshData : NULL input mesh !");
   di=computeTupleIdsToSelectFromCellIds(mesh,start,end);
   return mesh->buildPart(start,end);
 }
@@ -2113,6 +2208,11 @@ void MEDCouplingFieldDiscretizationKriging::checkCompatibilityWithNature(NatureO
 
 bool MEDCouplingFieldDiscretizationKriging::isEqualIfNotWhy(const MEDCouplingFieldDiscretization *other, double eps, std::string& reason) const
 {
+  if(!other)
+    {
+      reason="other spatial discretization is NULL, and this spatial discretization (Kriginig) is defined.";
+      return false;
+    }
   const MEDCouplingFieldDiscretizationKriging *otherC=dynamic_cast<const MEDCouplingFieldDiscretizationKriging *>(other);
   bool ret=otherC!=0;
   if(!ret)
@@ -2135,6 +2235,8 @@ void MEDCouplingFieldDiscretizationKriging::getValueOn(const DataArrayDouble *ar
 
 DataArrayDouble *MEDCouplingFieldDiscretizationKriging::getValueOnMulti(const DataArrayDouble *arr, const MEDCouplingMesh *mesh, const double *loc, int nbOfTargetPoints) const
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationKriging::getValueOnMulti : NULL input mesh !");
   MEDCouplingAutoRefCountObjectPtr<DataArrayDouble> coords=getLocalizationOfDiscValues(mesh);
   int nbOfPts=coords->getNumberOfTuples();
   int dimension=coords->getNumberOfComponents();
@@ -2184,6 +2286,8 @@ void MEDCouplingFieldDiscretizationKriging::reprQuickOverview(std::ostream& stre
  */
 DataArrayDouble *MEDCouplingFieldDiscretizationKriging::computeVectorOfCoefficients(const MEDCouplingMesh *mesh, const DataArrayDouble *arr, int& isDrift) const
 {
+  if(!mesh)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDiscretizationKriging::computeVectorOfCoefficients : NULL input mesh !");
   MEDCouplingAutoRefCountObjectPtr<DataArrayDouble> coords=getLocalizationOfDiscValues(mesh);
   int nbOfPts=coords->getNumberOfTuples();
   //int dimension=coords->getNumberOfComponents();
diff --git a/src/MEDCoupling/MEDCouplingFieldDiscretization.hxx b/src/MEDCoupling/MEDCouplingFieldDiscretization.hxx
index 5363e458c..96da042d0 100644
--- a/src/MEDCoupling/MEDCouplingFieldDiscretization.hxx
+++ b/src/MEDCoupling/MEDCouplingFieldDiscretization.hxx
@@ -205,7 +205,7 @@ namespace ParaMEDMEM
     bool isEqualWithoutConsideringStr(const MEDCouplingFieldDiscretization *other, double eps) const;
     void renumberCells(const int *old2NewBg, bool check) throw(INTERP_KERNEL::Exception);
   protected:
-    void buildDiscrPerCellIfNecessary(const MEDCouplingMesh *m);
+    void buildDiscrPerCellIfNecessary(const MEDCouplingMesh *mesh);
   protected:
     DataArrayInt *_discr_per_cell;
     static const int DFT_INVALID_LOCID_VALUE;
@@ -248,9 +248,9 @@ namespace ParaMEDMEM
     void renumberValuesOnNodes(double epsOnVals, const int *old2New, int newNbOfNodes, DataArrayDouble *arr) const;
     void renumberValuesOnCells(double epsOnVals, const MEDCouplingMesh *mesh, const int *old2New, int newSz, DataArrayDouble *arr) const;
     void renumberValuesOnCellsR(const MEDCouplingMesh *mesh, const int *new2old, int newSz, DataArrayDouble *arr) const;
-    void setGaussLocalizationOnType(const MEDCouplingMesh *m, INTERP_KERNEL::NormalizedCellType type, const std::vector<double>& refCoo,
+    void setGaussLocalizationOnType(const MEDCouplingMesh *mesh, INTERP_KERNEL::NormalizedCellType type, const std::vector<double>& refCoo,
                                     const std::vector<double>& gsCoo, const std::vector<double>& wg) throw(INTERP_KERNEL::Exception);
-    void setGaussLocalizationOnCells(const MEDCouplingMesh *m, const int *begin, const int *end, const std::vector<double>& refCoo,
+    void setGaussLocalizationOnCells(const MEDCouplingMesh *mesh, const int *begin, const int *end, const std::vector<double>& refCoo,
                                      const std::vector<double>& gsCoo, const std::vector<double>& wg) throw(INTERP_KERNEL::Exception);
     void clearGaussLocalizations() throw(INTERP_KERNEL::Exception);
     void setGaussLocalization(int locId, const MEDCouplingGaussLocalization& loc) throw(INTERP_KERNEL::Exception);
diff --git a/src/MEDCoupling/MEDCouplingFieldDouble.cxx b/src/MEDCoupling/MEDCouplingFieldDouble.cxx
index 27377d972..7d303c54e 100644
--- a/src/MEDCoupling/MEDCouplingFieldDouble.cxx
+++ b/src/MEDCoupling/MEDCouplingFieldDouble.cxx
@@ -169,7 +169,10 @@ MEDCouplingFieldDouble *MEDCouplingFieldDouble::deepCpy() const
 MEDCouplingFieldDouble *MEDCouplingFieldDouble::buildNewTimeReprFromThis(TypeOfTimeDiscretization td, bool deepCopy) const
 {
   MEDCouplingTimeDiscretization *tdo=_time_discr->buildNewTimeReprFromThis(td,deepCopy);
-  MEDCouplingFieldDouble *ret=new MEDCouplingFieldDouble(getNature(),tdo,_type->clone());
+  MEDCouplingAutoRefCountObjectPtr<MEDCouplingFieldDiscretization> disc;
+  if(_type)
+    disc=_type->clone();
+  MEDCouplingFieldDouble *ret=new MEDCouplingFieldDouble(getNature(),tdo,disc.retn());
   ret->setMesh(getMesh());
   ret->setName(getName());
   ret->setDescription(getDescription());
@@ -250,8 +253,14 @@ std::string MEDCouplingFieldDouble::advancedRepr() const
   std::ostringstream ret;
   ret << "FieldDouble with name : \"" << getName() << "\"\n";
   ret << "Description of field is : \"" << getDescription() << "\"\n";
-  ret << "FieldDouble space discretization is : " << _type->getStringRepr() << "\n";
-  ret << "FieldDouble time discretization is : " << _time_discr->getStringRepr() << "\n";
+  if(_type)
+    { ret << "FieldDouble space discretization is : " << _type->getStringRepr() << "\n"; }
+  else
+    { ret << "FieldDouble has no space discretization set !\n"; }
+  if(_time_discr)
+    { ret << "FieldDouble time discretization is : " << _time_discr->getStringRepr() << "\n"; }
+  else
+    { ret << "FieldDouble has no time discretization set !\n"; }
   if(getArray())
     ret << "FieldDouble default array has " << getArray()->getNumberOfComponents() << " components and " << getArray()->getNumberOfTuples() << " tuples.\n";
   if(_mesh)
@@ -412,7 +421,9 @@ void MEDCouplingFieldDouble::renumberCells(const int *old2NewBg, bool check) thr
 void MEDCouplingFieldDouble::renumberCellsWithoutMesh(const int *old2NewBg, bool check) throw(INTERP_KERNEL::Exception)
 {
    if(!_mesh)
-    throw INTERP_KERNEL::Exception("Expecting a defined mesh to be able to operate a renumbering !");
+     throw INTERP_KERNEL::Exception("Expecting a defined mesh to be able to operate a renumbering !");
+   if(!((const MEDCouplingFieldDiscretization *)_type))
+     throw INTERP_KERNEL::Exception("Expecting a spatial discretization to be able to operate a renumbering !");
   //
   _type->renumberCells(old2NewBg,check);
   std::vector<DataArrayDouble *> arrays;
@@ -446,6 +457,8 @@ void MEDCouplingFieldDouble::renumberNodes(const int *old2NewBg) throw(INTERP_KE
  */
 void MEDCouplingFieldDouble::renumberNodesWithoutMesh(const int *old2NewBg, int newNbOfNodes, double eps) throw(INTERP_KERNEL::Exception)
 {
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("Expecting a spatial discretization to be able to operate a renumbering !");
   std::vector<DataArrayDouble *> arrays;
   _time_discr->getArrays(arrays);
   for(std::vector<DataArrayDouble *>::const_iterator iter=arrays.begin();iter!=arrays.end();iter++)
@@ -523,6 +536,8 @@ MEDCouplingFieldDouble *MEDCouplingFieldDouble::buildSubPart(const DataArrayInt
  */
 MEDCouplingFieldDouble *MEDCouplingFieldDouble::buildSubPart(const int *partBg, const int *partEnd) const throw(INTERP_KERNEL::Exception)
 {
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDouble::buildSubPart : Expecting a not NULL spatial discretization !");
   DataArrayInt *arrSelect;
   MEDCouplingAutoRefCountObjectPtr<MEDCouplingMesh> m=_type->buildSubMeshData(_mesh,partBg,partEnd,arrSelect);
   MEDCouplingAutoRefCountObjectPtr<DataArrayInt> arrSelect2(arrSelect);
@@ -586,6 +601,8 @@ void MEDCouplingFieldDouble::checkCoherency() const throw(INTERP_KERNEL::Excepti
 {
   if(!_mesh)
     throw INTERP_KERNEL::Exception("Field invalid because no mesh specified !");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDouble::checkCoherency : no spatial discretization !");
   _time_discr->checkCoherency();
   _type->checkCoherencyBetween(_mesh,getArray());
 }
@@ -820,7 +837,9 @@ double MEDCouplingFieldDouble::getWeightedAverageValue(int compId, bool isWAbs)
 double MEDCouplingFieldDouble::normL1(int compId) const throw(INTERP_KERNEL::Exception)
 {
   if(!_mesh)
-    throw INTERP_KERNEL::Exception("No mesh underlying this field to perform normL1");
+    throw INTERP_KERNEL::Exception("No mesh underlying this field to perform normL1 !");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform normL1 !");
   int nbComps=getArray()->getNumberOfComponents();
   if(compId<0 || compId>=nbComps)
     {
@@ -843,6 +862,8 @@ void MEDCouplingFieldDouble::normL1(double *res) const throw(INTERP_KERNEL::Exce
 {
   if(!_mesh)
     throw INTERP_KERNEL::Exception("No mesh underlying this field to perform normL1");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform normL1 !");
   _type->normL1(_mesh,getArray(),res);
 }
 
@@ -857,6 +878,8 @@ double MEDCouplingFieldDouble::normL2(int compId) const throw(INTERP_KERNEL::Exc
 {
   if(!_mesh)
     throw INTERP_KERNEL::Exception("No mesh underlying this field to perform normL2");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform normL2 !");
   int nbComps=getArray()->getNumberOfComponents();
   if(compId<0 || compId>=nbComps)
     {
@@ -879,6 +902,8 @@ void MEDCouplingFieldDouble::normL2(double *res) const throw(INTERP_KERNEL::Exce
 {
   if(!_mesh)
     throw INTERP_KERNEL::Exception("No mesh underlying this field to perform normL2");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform normL2 !");
   _type->normL2(_mesh,getArray(),res);
 }
 
@@ -891,6 +916,8 @@ double MEDCouplingFieldDouble::integral(int compId, bool isWAbs) const throw(INT
 {
   if(!_mesh)
     throw INTERP_KERNEL::Exception("No mesh underlying this field to perform integral");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform integral !");
   int nbComps=getArray()->getNumberOfComponents();
   if(compId<0 || compId>=nbComps)
     {
@@ -911,6 +938,8 @@ void MEDCouplingFieldDouble::integral(bool isWAbs, double *res) const throw(INTE
 {
   if(!_mesh)
     throw INTERP_KERNEL::Exception("No mesh underlying this field to perform integral2");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform integral2 !");
   _type->integral(_mesh,getArray(),isWAbs,res);
 }
 
@@ -924,6 +953,8 @@ void MEDCouplingFieldDouble::getValueOnPos(int i, int j, int k, double *res) con
   const DataArrayDouble *arr=_time_discr->getArray();
   if(!_mesh)
     throw INTERP_KERNEL::Exception("No mesh underlying this field to perform getValueOnPos");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform getValueOnPos !");
   _type->getValueOnPos(arr,_mesh,i,j,k,res);
 }
 
@@ -936,6 +967,8 @@ void MEDCouplingFieldDouble::getValueOn(const double *spaceLoc, double *res) con
   const DataArrayDouble *arr=_time_discr->getArray();
   if(!_mesh)
     throw INTERP_KERNEL::Exception("No mesh underlying this field to perform getValueOn");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform getValueOnPos !");
   _type->getValueOn(arr,_mesh,spaceLoc,res);
 }
 
@@ -947,6 +980,8 @@ DataArrayDouble *MEDCouplingFieldDouble::getValueOnMulti(const double *spaceLoc,
   const DataArrayDouble *arr=_time_discr->getArray();
   if(!_mesh)
     throw INTERP_KERNEL::Exception("No mesh underlying this field to perform getValueOnMulti");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform getValueOnMulti !");
   return _type->getValueOnMulti(arr,_mesh,spaceLoc,nbOfPoints);
 }
 
@@ -960,6 +995,8 @@ void MEDCouplingFieldDouble::getValueOn(const double *spaceLoc, double time, dou
   std::vector< const DataArrayDouble *> arrs=_time_discr->getArraysForTime(time);
   if(!_mesh)
     throw INTERP_KERNEL::Exception("No mesh underlying this field to perform getValueOn");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform getValueOn !");
   std::vector<double> res2;
   for(std::vector< const DataArrayDouble *>::const_iterator iter=arrs.begin();iter!=arrs.end();iter++)
     {
@@ -987,6 +1024,8 @@ MEDCouplingFieldDouble &MEDCouplingFieldDouble::operator=(double value) throw(IN
 {
   if(!_mesh)
     throw INTERP_KERNEL::Exception("MEDCouplingFieldDouble::operator= : no mesh defined !");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform operator = !");
   int nbOfTuple=_type->getNumberOfTuples(_mesh);
   _time_discr->setUniformValue(nbOfTuple,1,value);
   return *this;
@@ -1002,6 +1041,8 @@ void MEDCouplingFieldDouble::fillFromAnalytic(int nbOfComp, FunctionToEvaluate f
 {
   if(!_mesh)
     throw INTERP_KERNEL::Exception("MEDCouplingFieldDouble::fillFromAnalytic : no mesh defined !");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform fillFromAnalytic !");
   MEDCouplingAutoRefCountObjectPtr<DataArrayDouble> loc=_type->getLocalizationOfDiscValues(_mesh);
   _time_discr->fillFromAnalytic(loc,nbOfComp,func);
 }
@@ -1016,6 +1057,8 @@ void MEDCouplingFieldDouble::fillFromAnalytic(int nbOfComp, const char *func) th
 {
   if(!_mesh)
     throw INTERP_KERNEL::Exception("MEDCouplingFieldDouble::fillFromAnalytic : no mesh defined !");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform fillFromAnalytic !");
   MEDCouplingAutoRefCountObjectPtr<DataArrayDouble> loc=_type->getLocalizationOfDiscValues(_mesh);
   _time_discr->fillFromAnalytic(loc,nbOfComp,func);
 }
@@ -1030,6 +1073,8 @@ void MEDCouplingFieldDouble::fillFromAnalytic2(int nbOfComp, const char *func) t
 {
   if(!_mesh)
     throw INTERP_KERNEL::Exception("MEDCouplingFieldDouble::fillFromAnalytic2 : no mesh defined !");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform fillFromAnalytic2 !");
   MEDCouplingAutoRefCountObjectPtr<DataArrayDouble> loc=_type->getLocalizationOfDiscValues(_mesh);
   _time_discr->fillFromAnalytic2(loc,nbOfComp,func);
 }
@@ -1044,6 +1089,8 @@ void MEDCouplingFieldDouble::fillFromAnalytic3(int nbOfComp, const std::vector<s
 {
   if(!_mesh)
     throw INTERP_KERNEL::Exception("MEDCouplingFieldDouble::fillFromAnalytic2 : no mesh defined !");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform fillFromAnalytic3 !");
   MEDCouplingAutoRefCountObjectPtr<DataArrayDouble> loc=_type->getLocalizationOfDiscValues(_mesh);
   _time_discr->fillFromAnalytic3(loc,nbOfComp,varsOrder,func);
 }
@@ -1065,6 +1112,8 @@ void MEDCouplingFieldDouble::applyFunc(int nbOfComp, double val)
 {
   if(!_mesh)
     throw INTERP_KERNEL::Exception("MEDCouplingFieldDouble::applyFunc : no mesh defined !");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform applyFunc !");
   int nbOfTuple=_type->getNumberOfTuples(_mesh);
   _time_discr->setUniformValue(nbOfTuple,nbOfComp,val);
 }
@@ -1150,6 +1199,8 @@ int MEDCouplingFieldDouble::getNumberOfTuples() const throw(INTERP_KERNEL::Excep
 {
   if(!_mesh)
     throw INTERP_KERNEL::Exception("Impossible to retrieve number of tuples because no mesh specified !");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform getNumberOfTuples !");
   return _type->getNumberOfTuples(_mesh);
 }
 
@@ -1182,7 +1233,8 @@ std::size_t MEDCouplingFieldDouble::getHeapMemorySize() const
 void MEDCouplingFieldDouble::setNature(NatureOfField nat) throw(INTERP_KERNEL::Exception)
 {
   MEDCouplingField::setNature(nat);
-  _type->checkCompatibilityWithNature(nat);
+  if(_type)
+    _type->checkCompatibilityWithNature(nat);
 }
 
 /*!
@@ -1202,6 +1254,8 @@ void MEDCouplingFieldDouble::synchronizeTimeWithMesh() throw(INTERP_KERNEL::Exce
 
 double MEDCouplingFieldDouble::getIJK(int cellId, int nodeIdInCell, int compoId) const
 {
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform getIJK !");
   return _type->getIJK(_mesh,getArray(),cellId,nodeIdInCell,compoId);
 }
 
@@ -1236,6 +1290,8 @@ void MEDCouplingFieldDouble::getTinySerializationStrInformation(std::vector<std:
  */
 void MEDCouplingFieldDouble::getTinySerializationIntInformation(std::vector<int>& tinyInfo) const
 {
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform getTinySerializationIntInformation !");
   tinyInfo.clear();
   tinyInfo.push_back((int)_type->getEnum());
   tinyInfo.push_back((int)_time_discr->getEnum());
@@ -1253,6 +1309,8 @@ void MEDCouplingFieldDouble::getTinySerializationIntInformation(std::vector<int>
  */
 void MEDCouplingFieldDouble::getTinySerializationDbleInformation(std::vector<double>& tinyInfo) const
 {
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform getTinySerializationDbleInformation !");
   tinyInfo.clear();
   _time_discr->getTinySerializationDbleInformation(tinyInfo);
   std::vector<double> tinyInfo2;
@@ -1270,6 +1328,8 @@ void MEDCouplingFieldDouble::getTinySerializationDbleInformation(std::vector<dou
  */
 void MEDCouplingFieldDouble::resizeForUnserialization(const std::vector<int>& tinyInfoI, DataArrayInt *&dataInt, std::vector<DataArrayDouble *>& arrays)
 {
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform resizeForUnserialization !");
   dataInt=0;
   std::vector<int> tinyInfoITmp(tinyInfoI);
   int sz=tinyInfoITmp.back();
@@ -1283,6 +1343,8 @@ void MEDCouplingFieldDouble::resizeForUnserialization(const std::vector<int>& ti
 
 void MEDCouplingFieldDouble::finishUnserialization(const std::vector<int>& tinyInfoI, const std::vector<double>& tinyInfoD, const std::vector<std::string>& tinyInfoS)
 {
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform finishUnserialization !");
   std::vector<int> tinyInfoI2(tinyInfoI.begin()+3,tinyInfoI.end());
   //
   std::vector<double> tmp(tinyInfoD);
@@ -1306,6 +1368,8 @@ void MEDCouplingFieldDouble::finishUnserialization(const std::vector<int>& tinyI
  */
 void MEDCouplingFieldDouble::serialize(DataArrayInt *&dataInt, std::vector<DataArrayDouble *>& arrays) const
 {
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform serialize !");
   _time_discr->getArrays(arrays);
   _type->getSerializationIntArray(dataInt);
 }
@@ -1355,6 +1419,8 @@ bool MEDCouplingFieldDouble::mergeNodes(double eps, double epsOnVals) throw(INTE
   const MEDCouplingPointSet *meshC=dynamic_cast<const MEDCouplingPointSet *>(_mesh);
   if(!meshC)
     throw INTERP_KERNEL::Exception("Invalid support mesh to apply mergeNodes on it : must be a MEDCouplingPointSet one !");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform mergeNodes !");
   MEDCouplingAutoRefCountObjectPtr<MEDCouplingPointSet> meshC2((MEDCouplingPointSet *)meshC->deepCpy());
   bool ret;
   int ret2;
@@ -1380,6 +1446,8 @@ bool MEDCouplingFieldDouble::mergeNodes2(double eps, double epsOnVals) throw(INT
   const MEDCouplingPointSet *meshC=dynamic_cast<const MEDCouplingPointSet *>(_mesh);
   if(!meshC)
     throw INTERP_KERNEL::Exception("Invalid support mesh to apply mergeNodes on it : must be a MEDCouplingPointSet one !");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform mergeNodes2 !");
   MEDCouplingAutoRefCountObjectPtr<MEDCouplingPointSet> meshC2((MEDCouplingPointSet *)meshC->deepCpy());
   bool ret;
   int ret2;
@@ -1405,6 +1473,8 @@ bool MEDCouplingFieldDouble::zipCoords(double epsOnVals) throw(INTERP_KERNEL::Ex
   const MEDCouplingPointSet *meshC=dynamic_cast<const MEDCouplingPointSet *>(_mesh);
   if(!meshC)
     throw INTERP_KERNEL::Exception("MEDCouplingFieldDouble::zipCoords : Invalid support mesh to apply zipCoords on it : must be a MEDCouplingPointSet one !");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform zipCoords !");
   MEDCouplingAutoRefCountObjectPtr<MEDCouplingPointSet> meshC2((MEDCouplingPointSet *)meshC->deepCpy());
   int oldNbOfNodes=meshC2->getNumberOfNodes();
   MEDCouplingAutoRefCountObjectPtr<DataArrayInt> arr=meshC2->zipCoordsTraducer();
@@ -1431,6 +1501,8 @@ bool MEDCouplingFieldDouble::zipConnectivity(int compType, double epsOnVals) thr
   const MEDCouplingUMesh *meshC=dynamic_cast<const MEDCouplingUMesh *>(_mesh);
   if(!meshC)
     throw INTERP_KERNEL::Exception("MEDCouplingFieldDouble::zipCoords : Invalid support mesh to apply zipCoords on it : must be a MEDCouplingPointSet one !");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform zipConnectivity !");
   MEDCouplingAutoRefCountObjectPtr<MEDCouplingUMesh> meshC2((MEDCouplingUMesh *)meshC->deepCpy());
   int oldNbOfCells=meshC2->getNumberOfCells();
   MEDCouplingAutoRefCountObjectPtr<DataArrayInt> arr=meshC2->zipConnectivityTraducer(compType);
@@ -1491,6 +1563,10 @@ MEDCouplingFieldDouble *MEDCouplingFieldDouble::extractSlice3D(const double *ori
  */
 bool MEDCouplingFieldDouble::simplexize(int policy) throw(INTERP_KERNEL::Exception)
 {
+  if(!_mesh)
+    throw INTERP_KERNEL::Exception("No underlying mesh on this field to perform simplexize !");
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform simplexize !");
   int oldNbOfCells=_mesh->getNumberOfCells();
   MEDCouplingAutoRefCountObjectPtr<MEDCouplingMesh> meshC2(_mesh->deepCpy());
   MEDCouplingAutoRefCountObjectPtr<DataArrayInt> arr=meshC2->simplexize(policy);
@@ -1508,6 +1584,8 @@ bool MEDCouplingFieldDouble::simplexize(int policy) throw(INTERP_KERNEL::Excepti
 
 MEDCouplingFieldDouble *MEDCouplingFieldDouble::doublyContractedProduct() const throw(INTERP_KERNEL::Exception)
 {
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform doublyContractedProduct !");
   MEDCouplingTimeDiscretization *td=_time_discr->doublyContractedProduct();
   td->copyTinyAttrFrom(*_time_discr);
   MEDCouplingFieldDouble *ret=new MEDCouplingFieldDouble(getNature(),td,_type->clone());
@@ -1518,6 +1596,8 @@ MEDCouplingFieldDouble *MEDCouplingFieldDouble::doublyContractedProduct() const
 
 MEDCouplingFieldDouble *MEDCouplingFieldDouble::determinant() const throw(INTERP_KERNEL::Exception)
 {
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform determinant !");
   MEDCouplingTimeDiscretization *td=_time_discr->determinant();
   td->copyTinyAttrFrom(*_time_discr);
   MEDCouplingFieldDouble *ret=new MEDCouplingFieldDouble(getNature(),td,_type->clone());
@@ -1528,6 +1608,8 @@ MEDCouplingFieldDouble *MEDCouplingFieldDouble::determinant() const throw(INTERP
 
 MEDCouplingFieldDouble *MEDCouplingFieldDouble::eigenValues() const throw(INTERP_KERNEL::Exception)
 {
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform eigenValues !");
   MEDCouplingTimeDiscretization *td=_time_discr->eigenValues();
   td->copyTinyAttrFrom(*_time_discr);
   MEDCouplingFieldDouble *ret=new MEDCouplingFieldDouble(getNature(),td,_type->clone());
@@ -1538,6 +1620,8 @@ MEDCouplingFieldDouble *MEDCouplingFieldDouble::eigenValues() const throw(INTERP
 
 MEDCouplingFieldDouble *MEDCouplingFieldDouble::eigenVectors() const throw(INTERP_KERNEL::Exception)
 {
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform eigenVectors !");
   MEDCouplingTimeDiscretization *td=_time_discr->eigenVectors();
   td->copyTinyAttrFrom(*_time_discr);
   MEDCouplingFieldDouble *ret=new MEDCouplingFieldDouble(getNature(),td,_type->clone());
@@ -1548,6 +1632,8 @@ MEDCouplingFieldDouble *MEDCouplingFieldDouble::eigenVectors() const throw(INTER
 
 MEDCouplingFieldDouble *MEDCouplingFieldDouble::inverse() const throw(INTERP_KERNEL::Exception)
 {
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform inverse !");
   MEDCouplingTimeDiscretization *td=_time_discr->inverse();
   td->copyTinyAttrFrom(*_time_discr);
   MEDCouplingFieldDouble *ret=new MEDCouplingFieldDouble(getNature(),td,_type->clone());
@@ -1558,6 +1644,8 @@ MEDCouplingFieldDouble *MEDCouplingFieldDouble::inverse() const throw(INTERP_KER
 
 MEDCouplingFieldDouble *MEDCouplingFieldDouble::trace() const throw(INTERP_KERNEL::Exception)
 {
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform trace !");
   MEDCouplingTimeDiscretization *td=_time_discr->trace();
   td->copyTinyAttrFrom(*_time_discr);
   MEDCouplingFieldDouble *ret=new MEDCouplingFieldDouble(getNature(),td,_type->clone());
@@ -1568,6 +1656,8 @@ MEDCouplingFieldDouble *MEDCouplingFieldDouble::trace() const throw(INTERP_KERNE
 
 MEDCouplingFieldDouble *MEDCouplingFieldDouble::deviator() const throw(INTERP_KERNEL::Exception)
 {
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform deviator !");
   MEDCouplingTimeDiscretization *td=_time_discr->deviator();
   td->copyTinyAttrFrom(*_time_discr);
   MEDCouplingFieldDouble *ret=new MEDCouplingFieldDouble(getNature(),td,_type->clone());
@@ -1578,6 +1668,8 @@ MEDCouplingFieldDouble *MEDCouplingFieldDouble::deviator() const throw(INTERP_KE
 
 MEDCouplingFieldDouble *MEDCouplingFieldDouble::magnitude() const throw(INTERP_KERNEL::Exception)
 {
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform magnitude !");
   MEDCouplingTimeDiscretization *td=_time_discr->magnitude();
   td->copyTinyAttrFrom(*_time_discr);
   MEDCouplingFieldDouble *ret=new MEDCouplingFieldDouble(getNature(),td,_type->clone());
@@ -1588,6 +1680,8 @@ MEDCouplingFieldDouble *MEDCouplingFieldDouble::magnitude() const throw(INTERP_K
 
 MEDCouplingFieldDouble *MEDCouplingFieldDouble::maxPerTuple() const throw(INTERP_KERNEL::Exception)
 {
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform maxPerTuple !");
   MEDCouplingTimeDiscretization *td=_time_discr->maxPerTuple();
   td->copyTinyAttrFrom(*_time_discr);
   MEDCouplingFieldDouble *ret=new MEDCouplingFieldDouble(getNature(),td,_type->clone());
@@ -1605,6 +1699,8 @@ void MEDCouplingFieldDouble::changeNbOfComponents(int newNbOfComp, double dftVal
 
 MEDCouplingFieldDouble *MEDCouplingFieldDouble::keepSelectedComponents(const std::vector<int>& compoIds) const throw(INTERP_KERNEL::Exception)
 {
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform keepSelectedComponents !");
   MEDCouplingTimeDiscretization *td=_time_discr->keepSelectedComponents(compoIds);
   td->copyTinyAttrFrom(*_time_discr);
   MEDCouplingFieldDouble *ret=new MEDCouplingFieldDouble(getNature(),td,_type->clone());
@@ -1629,6 +1725,12 @@ MEDCouplingFieldDouble *MEDCouplingFieldDouble::MergeFields(const MEDCouplingFie
     throw INTERP_KERNEL::Exception("Fields are not compatible ; unable to apply MergeFields on them !");
   const MEDCouplingMesh *m1=f1->getMesh();
   const MEDCouplingMesh *m2=f2->getMesh();
+  if(!m1)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDouble::MergeFields : no underlying mesh of f1 !");
+  if(!f1->_time_discr)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDouble::MergeFields : no time discr of f1 !");
+  if(!f1->_type)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDouble::MergeFields : no spatial discr of f1 !");
   MEDCouplingMesh *m=m1->mergeMyselfWith(m2);
   MEDCouplingTimeDiscretization *td=f1->_time_discr->aggregate(f2->_time_discr);
   td->copyTinyAttrFrom(*f1->_time_discr);
@@ -1655,6 +1757,8 @@ MEDCouplingFieldDouble *MEDCouplingFieldDouble::MergeFields(const std::vector<co
   std::vector< const MEDCouplingTimeDiscretization *> tds(a.size());
   std::vector<const MEDCouplingFieldDouble *>::const_iterator it=a.begin();
   const MEDCouplingFieldDouble *ref=(*it++);
+  if(!ref)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDouble::MergeFields : presence of NULL instance in first place of input vector !");
   for(;it!=a.end();it++)
     if(!ref->areCompatibleForMerge(*it))
       throw INTERP_KERNEL::Exception("Fields are not compatible ; unable to apply MergeFields on them !");
@@ -1690,6 +1794,8 @@ MEDCouplingFieldDouble *MEDCouplingFieldDouble::MeldFields(const MEDCouplingFiel
 
 MEDCouplingFieldDouble *MEDCouplingFieldDouble::DotFields(const MEDCouplingFieldDouble *f1, const MEDCouplingFieldDouble *f2) throw(INTERP_KERNEL::Exception)
 {
+  if(!f1)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDouble::DotFields : input field is NULL !");
   if(!f1->areStrictlyCompatible(f2))
     throw INTERP_KERNEL::Exception("Fields are not compatible ; unable to apply DotFields on them !");
   MEDCouplingTimeDiscretization *td=f1->_time_discr->dot(f2->_time_discr);
@@ -1701,6 +1807,8 @@ MEDCouplingFieldDouble *MEDCouplingFieldDouble::DotFields(const MEDCouplingField
 
 MEDCouplingFieldDouble *MEDCouplingFieldDouble::CrossProductFields(const MEDCouplingFieldDouble *f1, const MEDCouplingFieldDouble *f2) throw(INTERP_KERNEL::Exception)
 {
+  if(!f1)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDouble::CrossProductFields : input field is NULL !");
   if(!f1->areStrictlyCompatible(f2))
     throw INTERP_KERNEL::Exception("Fields are not compatible ; unable to apply CrossProductFields on them !");
   MEDCouplingTimeDiscretization *td=f1->_time_discr->crossProduct(f2->_time_discr);
@@ -1712,6 +1820,8 @@ MEDCouplingFieldDouble *MEDCouplingFieldDouble::CrossProductFields(const MEDCoup
 
 MEDCouplingFieldDouble *MEDCouplingFieldDouble::MaxFields(const MEDCouplingFieldDouble *f1, const MEDCouplingFieldDouble *f2) throw(INTERP_KERNEL::Exception)
 {
+  if(!f1)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDouble::MaxFields : input field is NULL !");
   if(!f1->areStrictlyCompatible(f2))
     throw INTERP_KERNEL::Exception("Fields are not compatible ; unable to apply MaxFields on them !");
   MEDCouplingTimeDiscretization *td=f1->_time_discr->max(f2->_time_discr);
@@ -1723,6 +1833,8 @@ MEDCouplingFieldDouble *MEDCouplingFieldDouble::MaxFields(const MEDCouplingField
 
 MEDCouplingFieldDouble *MEDCouplingFieldDouble::MinFields(const MEDCouplingFieldDouble *f1, const MEDCouplingFieldDouble *f2) throw(INTERP_KERNEL::Exception)
 {
+  if(!f1)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDouble::MinFields : input field is NULL !");
   if(!f1->areStrictlyCompatible(f2))
     throw INTERP_KERNEL::Exception("Fields are not compatible ; unable to apply MinFields on them !");
   MEDCouplingTimeDiscretization *td=f1->_time_discr->min(f2->_time_discr);
@@ -1734,6 +1846,8 @@ MEDCouplingFieldDouble *MEDCouplingFieldDouble::MinFields(const MEDCouplingField
 
 MEDCouplingFieldDouble *MEDCouplingFieldDouble::AddFields(const MEDCouplingFieldDouble *f1, const MEDCouplingFieldDouble *f2) throw(INTERP_KERNEL::Exception)
 {
+  if(!f1)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDouble::AddFields : input field is NULL !");
   if(!f1->areStrictlyCompatible(f2))
     throw INTERP_KERNEL::Exception("Fields are not compatible ; unable to apply AddFields on them !");
   MEDCouplingTimeDiscretization *td=f1->_time_discr->add(f2->_time_discr);
@@ -1753,6 +1867,8 @@ const MEDCouplingFieldDouble &MEDCouplingFieldDouble::operator+=(const MEDCoupli
 
 MEDCouplingFieldDouble *MEDCouplingFieldDouble::SubstractFields(const MEDCouplingFieldDouble *f1, const MEDCouplingFieldDouble *f2) throw(INTERP_KERNEL::Exception)
 {
+  if(!f1)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDouble::SubstractFields : input field is NULL !");
   if(!f1->areStrictlyCompatible(f2))
     throw INTERP_KERNEL::Exception("Fields are not compatible ; unable to apply SubstractFields on them !");
   MEDCouplingTimeDiscretization *td=f1->_time_discr->substract(f2->_time_discr);
@@ -1772,6 +1888,8 @@ const MEDCouplingFieldDouble &MEDCouplingFieldDouble::operator-=(const MEDCoupli
 
 MEDCouplingFieldDouble *MEDCouplingFieldDouble::MultiplyFields(const MEDCouplingFieldDouble *f1, const MEDCouplingFieldDouble *f2) throw(INTERP_KERNEL::Exception)
 {
+  if(!f1)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDouble::MultiplyFields : input field is NULL !");
   if(!f1->areCompatibleForMul(f2))
     throw INTERP_KERNEL::Exception("Fields are not compatible ; unable to apply MultiplyFields on them !");
   MEDCouplingTimeDiscretization *td=f1->_time_discr->multiply(f2->_time_discr);
@@ -1791,6 +1909,8 @@ const MEDCouplingFieldDouble &MEDCouplingFieldDouble::operator*=(const MEDCoupli
 
 MEDCouplingFieldDouble *MEDCouplingFieldDouble::DivideFields(const MEDCouplingFieldDouble *f1, const MEDCouplingFieldDouble *f2) throw(INTERP_KERNEL::Exception)
 {
+  if(!f1)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDouble::DivideFields : input field is NULL !");
   if(!f1->areCompatibleForDiv(f2))
     throw INTERP_KERNEL::Exception("Fields are not compatible ; unable to apply DivideFields on them !");
   MEDCouplingTimeDiscretization *td=f1->_time_discr->divide(f2->_time_discr);
@@ -1819,7 +1939,11 @@ void MEDCouplingFieldDouble::WriteVTK(const char *fileName, const std::vector<co
   if(fs.empty())
     return;
   std::size_t nfs=fs.size();
+  if(!fs[0])
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDouble::WriteVTK : 1st instance of field is NULL !");
   const MEDCouplingMesh *m=fs[0]->getMesh();
+  if(!m)
+    throw INTERP_KERNEL::Exception("MEDCouplingFieldDouble::WriteVTK : 1st instance of field lies on NULL mesh !");
   for(std::size_t i=1;i<nfs;i++)
     if(fs[i]->getMesh()!=m)
       throw INTERP_KERNEL::Exception("MEDCouplingFieldDouble::WriteVTK : Fields are not lying on a same mesh ! Expected by VTK ! MEDCouplingFieldDouble::setMesh or MEDCouplingFieldDouble::changeUnderlyingMesh can help to that.");
diff --git a/src/MEDCoupling/MEDCouplingFieldTemplate.cxx b/src/MEDCoupling/MEDCouplingFieldTemplate.cxx
index 225fa2896..70202d069 100644
--- a/src/MEDCoupling/MEDCouplingFieldTemplate.cxx
+++ b/src/MEDCoupling/MEDCouplingFieldTemplate.cxx
@@ -80,6 +80,8 @@ std::string MEDCouplingFieldTemplate::advancedRepr() const
 
 void MEDCouplingFieldTemplate::getTinySerializationIntInformation(std::vector<int>& tinyInfo) const
 {
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform getTinySerializationIntInformation !");
   tinyInfo.clear();
   tinyInfo.push_back((int)_type->getEnum());
   tinyInfo.push_back((int)_nature);
@@ -91,6 +93,8 @@ void MEDCouplingFieldTemplate::getTinySerializationIntInformation(std::vector<in
 
 void MEDCouplingFieldTemplate::getTinySerializationDbleInformation(std::vector<double>& tinyInfo) const
 {
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform getTinySerializationDbleInformation !");
   tinyInfo.clear();
   _type->getTinySerializationDbleInformation(tinyInfo);
 }
@@ -104,6 +108,8 @@ void MEDCouplingFieldTemplate::getTinySerializationStrInformation(std::vector<st
 
 void MEDCouplingFieldTemplate::resizeForUnserialization(const std::vector<int>& tinyInfoI, DataArrayInt *&dataInt)
 {
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform resizeForUnserialization !");
   dataInt=0;
   std::vector<int> tinyInfoITmp(tinyInfoI.begin()+2,tinyInfoI.end());
   _type->resizeForUnserialization(tinyInfoITmp,dataInt);
@@ -111,6 +117,8 @@ void MEDCouplingFieldTemplate::resizeForUnserialization(const std::vector<int>&
 
 void MEDCouplingFieldTemplate::finishUnserialization(const std::vector<int>& tinyInfoI, const std::vector<double>& tinyInfoD, const std::vector<std::string>& tinyInfoS)
 {
+  if(!((const MEDCouplingFieldDiscretization *)_type))
+    throw INTERP_KERNEL::Exception("No spatial discretization underlying this field to perform finishUnserialization !");
   _nature=(NatureOfField)tinyInfoI[1];
   _type->finishUnserialization(tinyInfoD);
   _name=tinyInfoS[0];