| 562 | // ADL is intentionally disabled as to_string_view is not an extension point. |
| 563 | template <typename S> |
| 564 | struct is_string |
| 565 | : std::is_class<decltype(detail::to_string_view(std::declval<S>()))> {}; |
| 566 | |
| 567 | template <typename S, typename = void> struct char_t_impl {}; |
| 568 | template <typename S> struct char_t_impl<S, enable_if_t<is_string<S>::value>> { |
nothing calls this directly
no test coverage detected