corrected includes and inline specifiers in TreePath

src/amdis/utility/TreePath.hpp

@@ -2,11 +2,13 @@
 
 #include <sstream>
 #include <string>
+#include <type_traits>
 
 #include <dune/common/std/apply.hh>
 #include <dune/typetree/treepath.hh>
 #include <dune/typetree/typetraits.hh>
 
+#include <amdis/common/Mpl.hpp>
 
 namespace AMDiS
 {
@@ -79,9 +81,9 @@ namespace AMDiS
 
 #else // DOXYGEN
 
-  auto makeTreePath(int i)         { return Dune::TypeTree::hybridTreePath(std::size_t(i)); }
-  auto makeTreePath(std::size_t i) { return Dune::TypeTree::hybridTreePath(i); }
-  auto makeTreePath(RootTreePath)  { return Dune::TypeTree::hybridTreePath(); }
+  inline auto makeTreePath(int i)         { return Dune::TypeTree::hybridTreePath(std::size_t(i)); }
+  inline auto makeTreePath(std::size_t i) { return Dune::TypeTree::hybridTreePath(i); }
+  inline auto makeTreePath(RootTreePath)  { return Dune::TypeTree::hybridTreePath(); }
 
 
   template <int I>
@@ -140,7 +142,7 @@ namespace AMDiS
     return ss.str();
   }
 
-  std::string to_string(Dune::TypeTree::HybridTreePath<> const& tp)
+  inline std::string to_string(Dune::TypeTree::HybridTreePath<> const& tp)
   {
     return "";
   }
@@ -160,7 +162,7 @@ namespace AMDiS
     return Impl::toArrayImpl(tp, std::make_index_sequence<1+sizeof...(T)>{});
   }
 
-  std::array<std::size_t,1> to_array(Dune::TypeTree::HybridTreePath<> const& tp)
+  inline std::array<std::size_t,1> to_array(Dune::TypeTree::HybridTreePath<> const& tp)
   {
     return {{0u}};
   }