make another AdditionalData ctor explicit

diff --git a/include/deal.II/lac/sparse_decomposition.h b/include/deal.II/lac/sparse_decomposition.h
index 6f472d60dc9f62df8435a60be9b50df22eda218e..79b7682038eee8ea30be61e9a8e0b0593a3bb45c 100644 (file)
--- a/include/deal.II/lac/sparse_decomposition.h
+++ b/include/deal.II/lac/sparse_decomposition.h
@@ -144,10 +144,10 @@ public:
     /**
      * Constructor. For the parameters' description, see below.
      */
-    AdditionalData(const double           strengthen_diagonal   = 0,
-                   const unsigned int     extra_off_diagonals   = 0,
-                   const bool             use_previous_sparsity = false,
-                   const SparsityPattern *use_this_sparsity     = nullptr);
+    explicit AdditionalData(const double       strengthen_diagonal   = 0.,
+                            const unsigned int extra_off_diagonals   = 0,
+                            const bool         use_previous_sparsity = false,
+                            const SparsityPattern *use_this_sparsity = nullptr);
 
     /**
      * <code>strengthen_diag</code> times the sum of absolute row entries is