Fix to make compile with clang-no-c++11.

diff --git a/include/deal.II/lac/la_vector.h b/include/deal.II/lac/la_vector.h
index 86b23bf715255b80d437b11e5dcd2f774608ff20..e14c508fbe0962358007bd5ce52ae5d8f26ddf99 100644 (file)
--- a/include/deal.II/lac/la_vector.h
+++ b/include/deal.II/lac/la_vector.h
@@ -138,7 +138,8 @@ namespace LinearAlgebra
     virtual void import(const ReadWriteVector<Number> &V,
                         VectorOperation::values operation,
                         std_cxx11::shared_ptr<const CommunicationPatternBase>
-                        communication_pattern = NULL);
+                        communication_pattern =
+                          std_cxx11::shared_ptr<const CommunicationPatternBase>());
 
     /**
      * Add @p a to all components. Note that @p a is a scalar not a vector.