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From: Patrick Palka <ppalka@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org, libstdc++-cvs@gcc.gnu.org Subject: [gcc r10-10195] libstdc++: Implement LWG 3557 change to convertible_to Date: Tue, 12 Oct 2021 18:37:35 +0000 (GMT) [thread overview] Message-ID: <20211012183735.315A63858413@sourceware.org> (raw) https://gcc.gnu.org/g:424972e8ce97fecd8b7ab900c0c9c5eb233728a1 commit r10-10195-g424972e8ce97fecd8b7ab900c0c9c5eb233728a1 Author: Patrick Palka <ppalka@redhat.com> Date: Fri Jun 18 11:51:33 2021 -0400 libstdc++: Implement LWG 3557 change to convertible_to libstdc++-v3/ChangeLog: * include/std/concepts (convertible_to): Just use declval as per LWG 3557. (cherry picked from commit 83faf7eacd2081a373afb6069fd923c2dc497271) Diff: --- libstdc++-v3/include/std/concepts | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/libstdc++-v3/include/std/concepts b/libstdc++-v3/include/std/concepts index e710a5e6ecd..5d173e5ebed 100644 --- a/libstdc++-v3/include/std/concepts +++ b/libstdc++-v3/include/std/concepts @@ -70,9 +70,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION /// [concept.convertible], concept convertible_to template<typename _From, typename _To> concept convertible_to = is_convertible_v<_From, _To> - && requires(add_rvalue_reference_t<_From> (&__f)()) { - static_cast<_To>(__f()); - }; + && requires { static_cast<_To>(std::declval<_From>()); }; /// [concept.commonref], concept common_reference_with template<typename _Tp, typename _Up>
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