radix_tree: fix assing_val

Realocating path should be taken for values which are instances
of basic_inline_string<CharT, Traits> (not only for CharT = char).

Author: igchor

include/libpmemobj++/detail/template_helpers.hpp

@@ -47,6 +47,16 @@ using is_transparent = typename Compare::is_transparent;
 template <typename Compare>
 using has_is_transparent = detail::supports<Compare, is_transparent>;
 
+/* Check if type is pmem::obj::basic_inline_string */
+template <typename>
+struct is_inline_string : std::false_type {
+};
+
+template <typename CharT, typename Traits>
+struct is_inline_string<obj::experimental::basic_inline_string<CharT, Traits>>
+    : std::true_type {
+};
+
 /* Check if type is pmem::obj::basic_string or
  * pmem::obj::basic_inline_string */
 template <typename>

include/libpmemobj++/experimental/radix_tree.hpp

@@ -598,12 +598,14 @@ struct radix_tree<Key, Value, BytesView>::radix_tree_iterator {
 
 	template <typename V = Value,
 		  typename Enable = typename std::enable_if<
-			  std::is_same<V, inline_string>::value>::type>
-	void assign_val(string_view rhs);
+			  detail::is_inline_string<V>::value>::type>
+	void assign_val(basic_string_view<typename V::value_type,
+					  typename V::traits_type>
+				rhs);
 
 	template <typename T, typename V = Value,
 		  typename Enable = typename std::enable_if<
-			  !std::is_same<V, inline_string>::value>::type>
+			  !detail::is_inline_string<V>::value>::type>
 	void assign_val(T &&rhs);
 
 	radix_tree_iterator &operator++();
@@ -2777,7 +2779,7 @@ template <bool IsConst>
 template <typename V, typename Enable>
 void
 radix_tree<Key, Value, BytesView>::radix_tree_iterator<IsConst>::assign_val(
-	string_view rhs)
+	basic_string_view<typename V::value_type, typename V::traits_type> rhs)
 {
 	auto pop = pool_base(pmemobj_pool_by_ptr(leaf_));