LWG4236 chunk_view::outer-iterator::value_type should provide reserve_hint

Author: burblebee

source/ranges.tex

@@ -14064,6 +14064,8 @@
 
     constexpr auto size() const
       requires @\libconcept{sized_sentinel_for}@<sentinel_t<V>, iterator_t<V>>;
+
+    constexpr auto reserve_hint() const noexcept;
   };
 }
 \end{codeblock}
@@ -14117,6 +14119,20 @@
 \end{codeblock}
 \end{itemdescr}
 
+\indexlibrarymember{reserve_hint}{chunk_view::\exposid{outer-iterator}::value_type}%
+\begin{itemdecl}
+constexpr auto reserve_hint() const noexcept;
+\end{itemdecl}
+
+\begin{itemdescr}
+\pnum
+\effects
+Equivalent to:
+\begin{codeblock}
+return @\exposid{to-unsigned-like}@(@\exposid{parent_}@->@\exposid{remainder_}@);
+\end{codeblock}
+\end{itemdescr}
+
 \rSec3[range.chunk.inner.iter]{Class \tcode{chunk_view::\exposid{inner-iterator}}}
 
 \indexlibraryglobal{chunk_view::\exposid{inner-iterator}}%