From: Patrick Palka <ppalka@redhat.com>
Date: Wed, 26 Feb 2025 19:51:38 +0000 (-0500)
Subject: libstdc++: Add code comment documenting LWG 4027 change [PR118083]
X-Git-Tag: basepoints/gcc-16~1833
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=640697f7c2def415db81c84010ae25be0785d867;p=thirdparty%2Fgcc.git

libstdc++: Add code comment documenting LWG 4027 change [PR118083]

	PR libstdc++/118083

libstdc++-v3/ChangeLog:

	* include/bits/ranges_base.h
	(ranges::__access::__possibly_const_range): Mention LWG 4027.
---

diff --git a/libstdc++-v3/include/bits/ranges_base.h b/libstdc++-v3/include/bits/ranges_base.h
index 28fe64a9e9d..516d04afdab 100644
--- a/libstdc++-v3/include/bits/ranges_base.h
+++ b/libstdc++-v3/include/bits/ranges_base.h
@@ -646,6 +646,8 @@ namespace ranges
       constexpr auto&
       __possibly_const_range(_Range& __r) noexcept
       {
+	// _GLIBCXX_RESOLVE_LIB_DEFECTS
+	// 4027. possibly-const-range should prefer returning const R&
 	if constexpr (input_range<const _Range>)
 	  return const_cast<const _Range&>(__r);
 	else