Revert "Remove redundant inline specifiers"

This reverts commit 1e705db.

Turns out they are needed...

Author: joto

include/osmium/index/relations_map.hpp

@@ -260,8 +260,8 @@ namespace osmium {
 
         // defined outside the class on purpose
         // see https://akrzemi1.wordpress.com/2015/09/11/declaring-the-move-constructor/
-        RelationsMapIndex::RelationsMapIndex(RelationsMapIndex&&) noexcept(std::is_nothrow_move_constructible<map_type>::value) = default;
-        RelationsMapIndex& RelationsMapIndex::operator=(RelationsMapIndex&&) noexcept(std::is_nothrow_move_assignable<map_type>::value) = default;
+        inline RelationsMapIndex::RelationsMapIndex(RelationsMapIndex&&) noexcept(std::is_nothrow_move_constructible<map_type>::value) = default;
+        inline RelationsMapIndex& RelationsMapIndex::operator=(RelationsMapIndex&&) noexcept(std::is_nothrow_move_assignable<map_type>::value) = default;
 
         class RelationsMapIndexes {
 
@@ -442,8 +442,8 @@ namespace osmium {
 
         // defined outside the class on purpose
         // see https://akrzemi1.wordpress.com/2015/09/11/declaring-the-move-constructor/
-        RelationsMapStash::RelationsMapStash(RelationsMapStash&&) noexcept(std::is_nothrow_move_constructible<map_type>::value) = default;
-        RelationsMapStash& RelationsMapStash::operator=(RelationsMapStash&&) noexcept(std::is_nothrow_move_assignable<map_type>::value) = default;
+        inline RelationsMapStash::RelationsMapStash(RelationsMapStash&&) noexcept(std::is_nothrow_move_constructible<map_type>::value) = default;
+        inline RelationsMapStash& RelationsMapStash::operator=(RelationsMapStash&&) noexcept(std::is_nothrow_move_assignable<map_type>::value) = default;
 
     } // namespace index
 

include/osmium/storage/item_stash.hpp

@@ -102,7 +102,7 @@ namespace osmium {
              * be printed as a unique (for an ItemStash object) number.
              */
             template <typename TChar, typename TTraits>
-            friend std::basic_ostream<TChar, TTraits>& operator<<(std::basic_ostream<TChar, TTraits>& out, const ItemStash::handle_type& handle) {
+            friend inline std::basic_ostream<TChar, TTraits>& operator<<(std::basic_ostream<TChar, TTraits>& out, const ItemStash::handle_type& handle) {
                 if (handle.valid()) {
                     out << handle.value;
                 } else {