From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 2181) id C0F0F3858430; Mon, 18 Mar 2024 14:06:10 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org C0F0F3858430 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1710770770; bh=aFzI8UteFDaghfPsWFF2wXRvoKhKGjPfc72JRGXx3oM=; h=From:To:Subject:Date:From; b=K4m7TK/aBcu888LpH3SJGplN9SZ66GgtXk3OMzRcqkp9qO7rnQA9Axwe8ZC+Giyon 3tQu+SCyrVUM2iP2LF5zCHmW9kwGMFStYgJaJ6GFUfGd/JzQBRgOkEV5bPVkuE3+CD suJxsn5Iym4jkEqw/X5olgjpzQzhxXrmHIBLpEFk= 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 r12-10253] libstdc++: Remove non-void static assertions in variant's std::get [PR111172] X-Act-Checkin: gcc X-Git-Author: Jonathan Wakely X-Git-Refname: refs/heads/releases/gcc-12 X-Git-Oldrev: c285c1b9a940bde745f296e1bfc1a5cfddb63254 X-Git-Newrev: 15c517049c0d8b6319990445939a69bb36fdc678 Message-Id: <20240318140610.C0F0F3858430@sourceware.org> Date: Mon, 18 Mar 2024 14:06:10 +0000 (GMT) List-Id: https://gcc.gnu.org/g:15c517049c0d8b6319990445939a69bb36fdc678 commit r12-10253-g15c517049c0d8b6319990445939a69bb36fdc678 Author: Jonathan Wakely Date: Tue Sep 12 21:28:38 2023 +0100 libstdc++: Remove non-void static assertions in variant's std::get [PR111172] A void template argument would cause a substitution failure when trying to form a reference for the return type, so the function body would never be instantiated. libstdc++-v3/ChangeLog: PR libstdc++/111172 * include/std/variant (get): Remove !is_void static assertions. (cherry picked from commit d19bdf8874059457fdfe50a9e14dad8f8b8cecbb) Diff: --- libstdc++-v3/include/std/variant | 4 ---- 1 file changed, 4 deletions(-) diff --git a/libstdc++-v3/include/std/variant b/libstdc++-v3/include/std/variant index 64145da12bb..9abe7b9ed6d 100644 --- a/libstdc++-v3/include/std/variant +++ b/libstdc++-v3/include/std/variant @@ -1150,7 +1150,6 @@ namespace __variant { static_assert(__detail::__variant::__exactly_once<_Tp, _Types...>, "T must occur exactly once in alternatives"); - static_assert(!is_void_v<_Tp>, "_Tp must not be void"); constexpr size_t __n = std::__find_uniq_type_in_pack<_Tp, _Types...>(); return std::get<__n>(__v); } @@ -1161,7 +1160,6 @@ namespace __variant { static_assert(__detail::__variant::__exactly_once<_Tp, _Types...>, "T must occur exactly once in alternatives"); - static_assert(!is_void_v<_Tp>, "_Tp must not be void"); constexpr size_t __n = std::__find_uniq_type_in_pack<_Tp, _Types...>(); return std::get<__n>(std::move(__v)); } @@ -1172,7 +1170,6 @@ namespace __variant { static_assert(__detail::__variant::__exactly_once<_Tp, _Types...>, "T must occur exactly once in alternatives"); - static_assert(!is_void_v<_Tp>, "_Tp must not be void"); constexpr size_t __n = std::__find_uniq_type_in_pack<_Tp, _Types...>(); return std::get<__n>(__v); } @@ -1183,7 +1180,6 @@ namespace __variant { static_assert(__detail::__variant::__exactly_once<_Tp, _Types...>, "T must occur exactly once in alternatives"); - static_assert(!is_void_v<_Tp>, "_Tp must not be void"); constexpr size_t __n = std::__find_uniq_type_in_pack<_Tp, _Types...>(); return std::get<__n>(std::move(__v)); }