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* [Bug libstdc++/104801] New: std::ranges::view_interface::empty is overconstrained @ 2022-03-05 21:16 reconnoo at gmail dot com 2022-03-06 4:16 ` [Bug libstdc++/104801] " hewillk at gmail dot com ` (3 more replies) 0 siblings, 4 replies; 5+ messages in thread From: reconnoo at gmail dot com @ 2022-03-05 21:16 UTC (permalink / raw) To: gcc-bugs 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 } ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libstdc++/104801] std::ranges::view_interface::empty is overconstrained 2022-03-05 21:16 [Bug libstdc++/104801] New: std::ranges::view_interface::empty is overconstrained reconnoo at gmail dot com @ 2022-03-06 4:16 ` hewillk at gmail dot com 2022-03-06 12:32 ` reconnoo at gmail dot com ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: hewillk at gmail dot com @ 2022-03-06 4:16 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104801 康桓瑋 <hewillk at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |hewillk at gmail dot com --- Comment #1 from 康桓瑋 <hewillk at gmail dot com> --- Because istream_view is a single pass range, once you call its begin(), it will change the internal state. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libstdc++/104801] std::ranges::view_interface::empty is overconstrained 2022-03-05 21:16 [Bug libstdc++/104801] New: std::ranges::view_interface::empty is overconstrained reconnoo at gmail dot com 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 3 siblings, 0 replies; 5+ messages in thread From: reconnoo at gmail dot com @ 2022-03-06 12:32 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104801 Pawel P <reconnoo at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |FIXED --- Comment #2 from Pawel P <reconnoo at gmail dot com> --- I understand. Thank you for clarification ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libstdc++/104801] std::ranges::view_interface::empty is overconstrained 2022-03-05 21:16 [Bug libstdc++/104801] New: std::ranges::view_interface::empty is overconstrained reconnoo at gmail dot com 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 3 siblings, 0 replies; 5+ messages in thread From: hewillk at gmail dot com @ 2022-03-06 12:37 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104801 --- Comment #3 from 康桓瑋 <hewillk at gmail dot com> --- (In reply to Pawel P from comment #2) > I understand. Thank you for clarification You should close with RESOLVED INVALID since there is nothing to fix. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libstdc++/104801] std::ranges::view_interface::empty is overconstrained 2022-03-05 21:16 [Bug libstdc++/104801] New: std::ranges::view_interface::empty is overconstrained reconnoo at gmail dot com ` (2 preceding siblings ...) 2022-03-06 12:37 ` hewillk at gmail dot com @ 2022-03-06 12:38 ` reconnoo at gmail dot com 3 siblings, 0 replies; 5+ messages in thread From: reconnoo at gmail dot com @ 2022-03-06 12:38 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104801 Pawel P <reconnoo at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|FIXED |INVALID ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2022-03-06 12:38 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2022-03-05 21:16 [Bug libstdc++/104801] New: std::ranges::view_interface::empty is overconstrained reconnoo at gmail dot com 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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