Prevent generating pull method for non-default constructable classes

README.md

@@ -34,9 +34,11 @@ The following table shows the mapping of supported C++ types to supported JSON t
 * For the same reason `const char *` strings are only supported for serialization.
 * Enums are (de)serialized as their underlying integer value. When deserializing, it is currently *not* checked
   whether the present integer value is a valid enumeration item.
-* For deserialization, iteratables must provide an `emplace_back` method. So deserialization of eg. `std::forward_list`
-  is currently not supported.
 * The JSON type for smart pointer depends on the type the pointer refers to. It can also be `null`.
+* For deserialization
+    * iteratables must provide an `emplace_back` method. So deserialization of eg. `std::forward_list`
+      is currently not supported.
+    * custom types must provide a default constructor.
 * For custom (de)serialization, see the section below.
 
 ## Usage

generator/jsonserializationcodegenerator.cpp

@@ -205,6 +205,11 @@ void JsonSerializationCodeGenerator::generate(ostream &os) const
         }
         os << "}\n";
 
+        // skip printing the pull method for classes without default constructor because deserializing those is currently not supported
+        if (!relevantClass.record->hasDefaultConstructor()) {
+            continue;
+        }
+
         // print pull method
         os << "template <> " << visibility << " void pull<::" << relevantClass.qualifiedName << ">(::" << relevantClass.qualifiedName
            << " &reflectable, const ::RAPIDJSON_NAMESPACE::GenericValue<::RAPIDJSON_NAMESPACE::UTF8<char>>::ConstObject &value, "