From 712b729ed527c7c062a37c77f9ff809c72a4d646 Mon Sep 17 00:00:00 2001
From: Daniel Arndt <daniel.arndt@iwr.uni-heidelberg.de>
Date: Sun, 18 Nov 2018 12:34:17 +0100
Subject: [PATCH] Constant initialization for Patterns' internal global
 variables

---
 include/deal.II/base/patterns.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/deal.II/base/patterns.h b/include/deal.II/base/patterns.h
index f5b300a8b0..c88df1bb2e 100644
--- 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
-- 
2.39.5