detect when assigning PETSc vectors to each other when they are not compress()ed

git-svn-id: https://svn.dealii.org/trunk@32464 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/include/deal.II/lac/petsc_parallel_vector.h b/deal.II/include/deal.II/lac/petsc_parallel_vector.h
index eaf007917a969a4d6141e04c1b293f3659c021c6..540bf0b23ef45fdf75cd8756e2d4f810d8c8cb11 100644 (file)
--- a/deal.II/include/deal.II/lac/petsc_parallel_vector.h
+++ b/deal.II/include/deal.II/lac/petsc_parallel_vector.h
@@ -596,6 +596,15 @@ namespace PETScWrappers
     Vector &
     Vector::operator = (const Vector &v)
     {
+      // make sure left- and right-hand side of the assignment are compress()'ed:
+      Assert(v.last_action == VectorOperation::unknown,
+            internal::VectorReference::ExcWrongMode (VectorOperation::unknown,
+                                                   v.last_action));
+      Assert(last_action == VectorOperation::unknown,
+            internal::VectorReference::ExcWrongMode (VectorOperation::unknown,
+                                                   last_action));
+
+
       if (v.size()==0)
         {
           // this happens if v has not been initialized to something useful: