From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 2181) id 19666385E02D; Sat, 11 Nov 2023 00:44:14 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 19666385E02D DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1699663454; bh=8ROEbAUAOs5Ntx4fNl+xlG4iMDe7soMCTmJVSdokDxo=; h=From:To:Subject:Date:From; b=gHAK1v9clGi7hRSK+yRADxLMOsVjf7EMX2p0SLbHjTSxd6r7vKqZYdSLkK1nVkALH iE+3P3s/rRuZa4h2MrZKZhC2aNE84/DGWiyPVVF/q+2PbmxDrxQ4KZJRGd3UfmsA1/ 0W50uuiBnLM79yLibQER0QwJUa/X+NiFXxcizApg= MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="utf-8" From: Jonathan Wakely To: gcc-cvs@gcc.gnu.org, libstdc++-cvs@gcc.gnu.org Subject: [gcc r14-5347] libstdc++: Add static_assert to std::integer_sequence [PR112473] X-Act-Checkin: gcc X-Git-Author: Jonathan Wakely X-Git-Refname: refs/heads/master X-Git-Oldrev: 94cc8e9d6f9f186d5fb1ca68fdf55e3c8090f3f6 X-Git-Newrev: 0953497a81f1e320989b9f2aaa7f56747eddd4a0 Message-Id: <20231111004414.19666385E02D@sourceware.org> Date: Sat, 11 Nov 2023 00:44:14 +0000 (GMT) List-Id: https://gcc.gnu.org/g:0953497a81f1e320989b9f2aaa7f56747eddd4a0 commit r14-5347-g0953497a81f1e320989b9f2aaa7f56747eddd4a0 Author: Jonathan Wakely Date: Fri Nov 10 12:21:52 2023 +0000 libstdc++: Add static_assert to std::integer_sequence [PR112473] C++20 allows class types as non-type template parameters, but std::integer_sequence explicitly disallows them. Enforce that. libstdc++-v3/ChangeLog: PR libstdc++/112473 * include/bits/utility.h (integer_sequence): Add static_assert. * testsuite/20_util/integer_sequence/112473.cc: New test. Diff: --- libstdc++-v3/include/bits/utility.h | 3 +++ libstdc++-v3/testsuite/20_util/integer_sequence/112473.cc | 8 ++++++++ 2 files changed, 11 insertions(+) diff --git a/libstdc++-v3/include/bits/utility.h b/libstdc++-v3/include/bits/utility.h index 8766dfbc15f..ebcf5ba36b2 100644 --- a/libstdc++-v3/include/bits/utility.h +++ b/libstdc++-v3/include/bits/utility.h @@ -166,6 +166,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION template struct integer_sequence { +#if __cplusplus >= 202002L + static_assert(is_integral_v<_Tp>); +#endif typedef _Tp value_type; static constexpr size_t size() noexcept { return sizeof...(_Idx); } }; diff --git a/libstdc++-v3/testsuite/20_util/integer_sequence/112473.cc b/libstdc++-v3/testsuite/20_util/integer_sequence/112473.cc new file mode 100644 index 00000000000..14abfbc8149 --- /dev/null +++ b/libstdc++-v3/testsuite/20_util/integer_sequence/112473.cc @@ -0,0 +1,8 @@ +// { dg-do compile { target c++20 } } + +// PR libstdc++/112473 - integer_sequence accepts non-integer types + +#include + +std::integer_sequence, std::pair{0, 0}> ic; +// { dg-error "static assertion failed" "" { target *-*-* } 0 }