Make a constructor 'explicit'.

diff --git a/include/deal.II/lac/petsc_precondition.h b/include/deal.II/lac/petsc_precondition.h
index 95eb7214a5e77cf16edc42cbfe9926d5b92a9e9c..37cf282832d596625a02ee71435e94b6aaba1091 100644 (file)
--- a/include/deal.II/lac/petsc_precondition.h
+++ b/include/deal.II/lac/petsc_precondition.h
@@ -368,7 +368,7 @@ namespace PETScWrappers
       /**
        * Constructor. By default, set the damping parameter to one.
        */
-      AdditionalData(const double omega = 1);
+      explicit AdditionalData(const double omega = 1);
 
       /**
        * Relaxation parameter.