Fix a misplaced forward declaration.

diff --git a/include/deal.II/lac/cuda_vector.h b/include/deal.II/lac/cuda_vector.h
index 8032d9007d8331dfa9538409a9a2a74283cfaaa2..e0afc93c18894bd79f74c2444b836310d37aa187 100644 (file)
--- a/include/deal.II/lac/cuda_vector.h
+++ b/include/deal.II/lac/cuda_vector.h
@@ -31,8 +31,11 @@ DEAL_II_NAMESPACE_OPEN
 
 // Forward declarations
 #  ifndef DOXYGEN
-template <typename Number>
-class ReadWriteVector;
+namespace LinearAlgebra
+{
+  template <typename Number>
+  class ReadWriteVector;
+}
 #  endif
 
 namespace LinearAlgebra