Function merge_or_update

include/jsoncons/basic_json.hpp:4404–4433

        // merge_or_update

        void merge_or_update(const basic_json& source)
        {
            switch (source.storage_kind())
            {
                case json_storage_kind::empty_object:
                    break;
                case json_storage_kind::object:
                    switch (storage_kind())
                    {
                        case json_storage_kind::empty_object:
                            create_object_implicitly();
                            cast<object_storage>().value().merge_or_update(source.cast<object_storage>().value());
                            break;
                        case json_storage_kind::object:
                            cast<object_storage>().value().merge_or_update(source.cast<object_storage>().value());
                            break;
                        case json_storage_kind::json_ref:
                            cast<json_ref_storage>().value().merge_or_update(source);
                            break;
                        default:
                            JSONCONS_THROW(json_runtime_error<std::domain_error>("Attempting to merge or update a value that is not an object"));
                    }
                    break;
                case json_storage_kind::json_ref:
                    merge_or_update(source.cast<json_ref_storage>().value());
                    break;
                default:
                    JSONCONS_THROW(json_runtime_error<std::domain_error>("Attempting to merge a value that is not an object"));
            }
        }

        void merge_or_update(basic_json&& source)
        {