On range insert in tsl::array_map, try to move the value when possibl…

…e (e.g. if the iterators are std::move_iterator).

tsl/array_map.h

@@ -226,7 +226,7 @@ class array_map {
         }
 
         for(auto it = first; it != last; ++it) {
-            insert(it->first, it->second);
+            insert_pair(*it);
         }
     }
 
@@ -778,6 +778,17 @@ class array_map {
         lhs.swap(rhs);
     }
 
+private:
+    template<class U, class V>
+    void insert_pair(const std::pair<U, V>& value) {
+        insert(value.first, value.second);
+    }
+
+    template<class U, class V>
+    void insert_pair(std::pair<U, V>&& value) {
+        insert(value.first, std::move(value.second));
+    }    
+
 public:
     static const size_type MAX_KEY_SIZE = ht::MAX_KEY_SIZE;