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From: "reconnoo at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug libstdc++/104801] New: std::ranges::view_interface::empty is overconstrained Date: Sat, 05 Mar 2022 21:16:44 +0000 [thread overview] Message-ID: <bug-104801-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104801 Bug ID: 104801 Summary: std::ranges::view_interface::empty is overconstrained Product: gcc Version: 12.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libstdc++ Assignee: unassigned at gcc dot gnu.org Reporter: reconnoo at gmail dot com Target Milestone: --- I can't see why empty() needs a forward_iterator. It looks overconstrained and input_iterator should suffice because it is equivalent to the begin/end iterator comparison, yet, somehow this does not compile: auto is = std::istringstream{"1 2 3"}; auto v = ranges::istream_view<int>(is); { auto is_empty = v.empty(); // error } { auto [begin, end] = std::subrange(v); auto is_empty = begin == end; // works }
next reply other threads:[~2022-03-05 21:16 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-03-05 21:16 reconnoo at gmail dot com [this message] 2022-03-06 4:16 ` [Bug libstdc++/104801] " hewillk at gmail dot com 2022-03-06 12:32 ` reconnoo at gmail dot com 2022-03-06 12:37 ` hewillk at gmail dot com 2022-03-06 12:38 ` reconnoo at gmail dot com
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