Method get_impl

imperative/python/src/utils.cpp:428–433

        }

        std::shared_ptr<ExtendedPersistentCache> get_impl() {
            if (!impl) {
                load_config();
            }
            return impl;
        }

        virtual mgb::Maybe<Blob> get(const std::string& category, const Blob& key) {
            return get_impl()->get(category, key);