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From: "frankhb1989 at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug libstdc++/111357] New: __integer_pack fails to work with values of dependent type convertible to integers Date: Sun, 10 Sep 2023 02:16:21 +0000 [thread overview] Message-ID: <bug-111357-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111357 Bug ID: 111357 Summary: __integer_pack fails to work with values of dependent type convertible to integers Product: gcc Version: 13.1.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libstdc++ Assignee: unassigned at gcc dot gnu.org Reporter: frankhb1989 at gmail dot com Target Milestone: --- Case: #include <cstddef> #include <type_traits> #include <tuple> using std::size_t; #if __cpp_lib_integer_sequence >= 201304L using std::index_sequence; using std::make_index_sequence; #else template<size_t... V> struct index_sequence {}; template<class> struct succ; template<size_t... V> struct succ<index_sequence<V...>> { using type = index_sequence<V..., sizeof...(V)>; }; template<size_t N> struct iseq { using type = typename succ<typename iseq<N - 1>::type>::type; }; template<> struct iseq<0> { using type = index_sequence<>; }; template<size_t N> using make_index_sequence = typename iseq<N>::type; #endif template<size_t... V> void g(index_sequence<V...>) {} template<typename T> struct R { using S = make_index_sequence<std::tuple_size<std::tuple<T>>{}>; R() noexcept(noexcept(g(S()))) {} }; int main() { R<int>(); } Output of x86-64 gcc 13.2 (Compiler #1) <source>: In instantiation of 'R<T>::R() [with T = int]': <source>:55:9: required from here <source>:49:33: error: argument to '__integer_pack' must be between 0 and 268435452 49 | R() noexcept(noexcept(g(S()))) | ^~~ This should work as -std=c++11 which uses a naive implementation of make_index_sequence here. I mark it as a libstdc++ bug of conformance for the case. The root cause seems a bug of the implementation in the frontend, but I'm not that sure, because the document of __integer_pack does not mention such cases explicitly. (The error message here is obviously confusing, though.)
next reply other threads:[~2023-09-10 2:16 UTC|newest] Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-09-10 2:16 frankhb1989 at gmail dot com [this message] 2023-09-10 3:33 ` [Bug c++/111357] " pinskia at gcc dot gnu.org 2023-09-10 3:52 ` [Bug c++/111357] __integer_pack fails to work with values of dependent type convertible to integers in noexcept context pinskia at gcc dot gnu.org 2023-09-10 3:56 ` [Bug c++/111357] [11/12/13/14 Regression] " pinskia at gcc dot gnu.org 2023-09-11 8:54 ` redi at gcc dot gnu.org 2023-09-11 13:39 ` jason at gcc dot gnu.org 2023-09-11 13:43 ` jakub at gcc dot gnu.org 2023-09-12 17:27 ` cvs-commit at gcc dot gnu.org 2023-09-14 13:27 ` cvs-commit at gcc dot gnu.org 2023-09-14 13:39 ` cvs-commit at gcc dot gnu.org 2023-09-14 13:40 ` cvs-commit at gcc dot gnu.org 2023-09-14 13:42 ` cvs-commit at gcc dot gnu.org 2023-09-22 14:36 ` cvs-commit at gcc dot gnu.org 2023-09-23 7:41 ` jakub at gcc dot gnu.org 2024-01-19 18:35 ` cvs-commit at gcc dot gnu.org 2024-01-19 19:29 ` jason at gcc dot gnu.org
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