remove C++17 nested-namespace-definition

CHANGELOG.rst

@@ -2,6 +2,13 @@
 Changelog
 =========
 
+Version 1.0
+-----------
+
+Version 1.0.0
+*************
+- Bug: Nested namespace definitions were present, which are a C++17 feature.
+
 Version 0.9
 -----------
 

include/ALL_Functions.hpp

@@ -5,7 +5,8 @@
 #include <cmath>
 #include <vector>
 
-namespace ALL::Functions {
+namespace ALL{
+namespace Functions {
 
 /// function to compute the one-dimensional shift of the border between the
 /// local process and the process indicated by neighbor_rank
@@ -65,5 +66,5 @@ T borderShift1d(const int remote_rank, const int local_coord,
   return shift;
 }
 
-}// namespace ALL::Functions
+}}// namespace ALL::Functions
 #endif