Function JSON_INTERNAL_CATCH

src/include/nlohmann/json.hpp:2365–2368

                return ptr.get_checked(this).template get<ValueType>();
            }
            JSON_INTERNAL_CATCH (out_of_range&)
            {
                return default_value;
            }
        }

        JSON_THROW(type_error::create(306, detail::concat("cannot use value() with ", type_name()), this));