format std::reference_wrapper

Author: yfeldblum

include/fmt/format.h

@@ -3936,6 +3936,11 @@ struct formatter<T, Char,
                  enable_if_t<(detail::bitint_traits<T>::is_formattable)>>
     : formatter<typename detail::bitint_traits<T>::format_type, Char> {};
 
+template <typename T>
+constexpr auto format_as(std::reference_wrapper<T> ref) -> T& {
+  return ref.get();
+}
+
 /**
  * Converts `p` to `const void*` for pointer formatting.
  *