From feed7ba17bea202163a5d888026add386b1692f6 Mon Sep 17 00:00:00 2001
From: Luca Heltai <luca.heltai@sissa.it>
Date: Fri, 27 Oct 2017 15:51:17 +0200
Subject: [PATCH] Remove decltype(auto) (cxx14)

---
 include/deal.II/base/patterns.h | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/include/deal.II/base/patterns.h b/include/deal.II/base/patterns.h
index 8d12d0b5f0..5e5de71143 100644
--- a/include/deal.II/base/patterns.h
+++ b/include/deal.II/base/patterns.h
@@ -1925,9 +1925,10 @@ namespace Patterns
 
       template<std::size_t... I>
       static
-      decltype(auto) to_string_internal_1(const T &t,
-                                          const Patterns::Tuple &pattern,
-                                          std_cxx14::index_sequence<I...>)
+      std::array<std::string, std::tuple_size<T>::value>
+      to_string_internal_1(const T &t,
+                           const Patterns::Tuple &pattern,
+                           std_cxx14::index_sequence<I...>)
       {
         std::array<std::string, std::tuple_size<T>::value> a
         = {{
@@ -1939,8 +1940,9 @@ namespace Patterns
       }
 
       static
-      decltype(auto) to_string_internal_2(const T &t,
-                                          const Patterns::Tuple &pattern)
+      std::array<std::string, std::tuple_size<T>::value>
+      to_string_internal_2(const T &t,
+                           const Patterns::Tuple &pattern)
       {
         return Convert<T>::to_string_internal_1(t, pattern,
                                                 std_cxx14::make_index_sequence<std::tuple_size<T>::value> {});
-- 
2.39.5