From: Avi Kivity <avi@scylladb.com>
Date: Mon, 7 Jun 2021 15:19:05 +0000 (-0400)
Subject: libstdc++: add missing typename for dependent type in ranges::elements_view [PR100900]
X-Git-Tag: releases/gcc-11.2.0~283
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=23fa1e7eab7680ae0488b4c8802b0bcd8f78425d;p=thirdparty%2Fgcc.git

libstdc++: add missing typename for dependent type in ranges::elements_view [PR100900]

Clang complains about the missing typename. I believe it's not required
in a more complete implementation of C++, but it's nicer to support
less complete implementations.

	PR libstdc++/100900

libstdc++-v3/ChangeLog:

	* include/std/ranges (elements_view::__iter_cat::_S_iter_cat):
	Add missing typename.

(cherry picked from commit 5e2e15f212e2458a1258b8c856895c755460bc6b)
---

diff --git a/libstdc++-v3/include/std/ranges b/libstdc++-v3/include/std/ranges
index ae3cd7fbc996..0dd4fb6a9a5e 100644
--- a/libstdc++-v3/include/std/ranges
+++ b/libstdc++-v3/include/std/ranges
@@ -3463,7 +3463,7 @@ namespace views::__adaptor
 	  static auto _S_iter_cat()
 	  {
 	    using _Base = elements_view::_Base<_Const>;
-	    using _Cat = iterator_traits<iterator_t<_Base>>::iterator_category;
+	    using _Cat = typename iterator_traits<iterator_t<_Base>>::iterator_category;
 	    using _Res = decltype((std::get<_Nm>(*std::declval<iterator_t<_Base>>())));
 	    if constexpr (!is_lvalue_reference_v<_Res>)
 	      return input_iterator_tag{};