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From: "hewillk at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug libstdc++/100567] New: views::take and views::drop should conditionally use _RangeAdaptor::operator() Date: Wed, 12 May 2021 13:18:30 +0000 [thread overview] Message-ID: <bug-100567-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100567 Bug ID: 100567 Summary: views::take and views::drop should conditionally use _RangeAdaptor::operator() Product: gcc Version: 12.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libstdc++ Assignee: unassigned at gcc dot gnu.org Reporter: hewillk at gmail dot com Target Milestone: --- Hi, the re-implemented range adaptors use _RangeAdaptor to handle the arg of the adaptors, but for views::take and views::drop, the constraint that this arg can perfectly forward to range::range_difference_t<V> is lacking. https://godbolt.org/z/j88q5Yn6Y #include <ranges> struct S { operator int() { return 0; } }; const S obj; auto r = std::views::iota(0, 3); auto d1 = r | std::views::drop(obj); // ok, should error auto d2 = std::views::drop(r, obj); // error auto f1 = r | std::views::take(obj); // ok, should error auto f2 = std::views::take(r, obj); // error
next reply other threads:[~2021-05-12 13:18 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-05-12 13:18 hewillk at gmail dot com [this message] 2021-05-12 17:58 ` [Bug libstdc++/100567] " ppalka at gcc dot gnu.org 2021-05-13 2:06 ` hewillk at gmail dot com
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