From 23bf3a5647f06e5abe573efea1ce567a98a4193b Mon Sep 17 00:00:00 2001
From: Edward Nolan <eddiejnolan@gmail.com>
Date: Mon, 21 Sep 2026 23:46:13 -0400
Subject: [PATCH] Set difference_type to range_difference_t<Base>, not
 ptrdiff_t

---
 include/beman/utf_view/to_utf_view.hpp | 2 +-
 papers/P2728.md                        | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/beman/utf_view/to_utf_view.hpp b/include/beman/utf_view/to_utf_view.hpp
index f13aee2..957a02e 100644
--- a/include/beman/utf_view/to_utf_view.hpp
+++ b/include/beman/utf_view/to_utf_view.hpp
@@ -296,7 +296,7 @@ struct to_utf_view<V, E, ToType>::exposition_only_iterator : detail::iter_catego
   using value_type =
       std::conditional_t<E == to_utf_view_kind::expected, std::expected<ToType, utf_transcoding_error>, ToType>;
   using reference_type = value_type;
-  using difference_type = std::ptrdiff_t;
+  using difference_type = std::ranges::range_difference_t<exposition_only_Base>;
 
 private:
 /* !PAPER */
diff --git a/papers/P2728.md b/papers/P2728.md
index a7564d5..b4e2dd9 100644
--- a/papers/P2728.md
+++ b/papers/P2728.md
@@ -785,7 +785,7 @@ public:
   using iterator_category = @*see below*@;  // @*not always present*@
   using value_type = conditional_t<E == to_utf_view_kind::expected, expected<ToType, utf_transcoding_error>, ToType>;
   using reference_type = value_type;
-  using difference_type = ptrdiff_t;
+  using difference_type = range_difference_t<@*Base*@>;
 
 private:
   iterator_t<@*Base*@> @*begin_*@{}; // @*exposition only*@, present only if