Add is_templated() helper

include/cppast/cpp_entity.hpp

@@ -119,7 +119,15 @@ namespace cppast
         friend detail::intrusive_list_node<cpp_entity>;
     };
 
+    /// \returns Whether or not the entity is templated.
+    /// If this function returns `true` that means the entity is not the "real" entity,
+    /// but contains just the information for the template which is the parent entity.
+    /// \notes Do not use this entity other to read information from the template entity.
+    bool is_templated(const cpp_entity& e) noexcept;
+
     /// \returns The full name of the [cppast::cpp_entity](), with all scopes.
+    /// \notes Enitites without a name ([cppast::cpp_using_declaration]() etc.) do not have a full name either.
+    /// \notes For (template) parameters the full name is the name itself.
     std::string full_name(const cpp_entity& e);
 } // namespace cppast