Constant initialization for Patterns' internal global variables

diff --git a/include/deal.II/base/patterns.h b/include/deal.II/base/patterns.h
index f5b300a8b0a08603730ed68751752e1ed6a93242..c88df1bb2e292ee0fbfed6d922a512604a70ca9c 100644 (file)
--- a/include/deal.II/base/patterns.h
+++ b/include/deal.II/base/patterns.h
@@ -1568,9 +1568,9 @@ namespace Patterns
 
     namespace internal
     {
-      const std::array<std::string, 4> default_list_separator{
+      constexpr std::array<const char *, 4> default_list_separator{
         {",", ";", "|", "%"}};
-      const std::array<std::string, 4> default_map_separator{
+      constexpr std::array<const char *, 4> default_map_separator{
         {":", "=", "@", "#"}};
 
       // specialize a type for all of the STL containers and maps