COMP: Fix particle reader warnings

Change-Id: I7bc47008e2c14a6bdefa0760cc5bed61471954da

AMR/vtkAMREnzoParticlesReader.cxx

@@ -275,7 +275,7 @@ vtkPolyData* vtkAMREnzoParticlesReader::GetParticles(
   assert( "Coordinate arrays must have the same size: " &&
            (ycoords.size()==zcoords.size() ) );
 
-  int TotalNumberOfParticles = xcoords.size();
+  int TotalNumberOfParticles = static_cast<int>(xcoords.size());
   positions->SetNumberOfPoints( TotalNumberOfParticles );
 
   vtkIdList *ids = vtkIdList::New();
@@ -369,7 +369,8 @@ void vtkAMREnzoParticlesReader::SetupParticleDataSelections()
 {
   assert( "pre: Intenal reader is NULL" && (this->Internal != NULL) );
 
-  unsigned int N = this->Internal->ParticleAttributeNames.size();
+  unsigned int N =
+    static_cast<unsigned int>( this->Internal->ParticleAttributeNames.size() );
   for( unsigned int i=0; i < N; ++i )
     {
 

AMR/vtkAMRFlashParticlesReader.cxx

@@ -208,7 +208,7 @@ vtkPolyData* vtkAMRFlashParticlesReader::GetParticles(
       this->Internal, this->Internal->NumberOfParticles );
 
   // Sub-sample particles
-  int TotalNumberOfParticles        = xcoords.size();
+  int TotalNumberOfParticles        = static_cast<int>(xcoords.size());
   vtkIdList *ids                    = vtkIdList::New();
   ids->SetNumberOfIds( TotalNumberOfParticles );
 
@@ -356,7 +356,8 @@ void vtkAMRFlashParticlesReader::SetupParticleDataSelections()
 {
   assert( "pre: Internal reader is NULL" && (this->Internal != NULL) );
 
-  unsigned int N = this->Internal->ParticleAttributeNames.size();
+  unsigned int N =
+      static_cast<unsigned int>(this->Internal->ParticleAttributeNames.size());
   for( unsigned int i=0; i < N; ++i )
     {
        this->ParticleDataArraySelection->AddArray(