From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 2181) id 1963E3858CDA; Tue, 10 Jan 2023 10:10:04 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 1963E3858CDA DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1673345404; bh=lQSy1KYf5SCgnb3sFGLXy81zv7yqMXO9zSD2oVIxXKQ=; h=From:To:Subject:Date:From; b=oh4ucBkHpIM6akuarN4ZybbT0zmAA0jRLDSh/ZE5aF4WpL4B86Z5rBtoMqzmqCC3r okfx0nqmEHgMQF0ncdpGVYDKGpL6UyJ3cVROC/YhqF2K9/fOfuq2Drv7NtWD0WB0bh nrbwzT2fJtyqbb8JzLAtU/Kwqmhazqwaau3alVsE= 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 r13-5079] libstdc++: Fix std::span constraint for sizeof(size_t) < sizeof(int) [PR108221] X-Act-Checkin: gcc X-Git-Author: Jonathan Wakely X-Git-Refname: refs/heads/master X-Git-Oldrev: 0333892db367b2b97b1ab9d3702b16f3f9e92ec3 X-Git-Newrev: b39f4333d18cc58b1a655c537a78fefe95b82609 Message-Id: <20230110101004.1963E3858CDA@sourceware.org> Date: Tue, 10 Jan 2023 10:10:04 +0000 (GMT) List-Id: https://gcc.gnu.org/g:b39f4333d18cc58b1a655c537a78fefe95b82609 commit r13-5079-gb39f4333d18cc58b1a655c537a78fefe95b82609 Author: Jonathan Wakely Date: Mon Jan 9 10:45:31 2023 +0000 libstdc++: Fix std::span constraint for sizeof(size_t) < sizeof(int) [PR108221] The default constructor has a constraint that is always false if arithmetic on size_t values promotes to int. Rewrite the constraint exactly as written in the standard, which works correctly. libstdc++-v3/ChangeLog: PR libstdc++/108221 * include/std/span (span::span()): Un-simplify constraint to work for size_t of lesser rank than int. Diff: --- libstdc++-v3/include/std/span | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libstdc++-v3/include/std/span b/libstdc++-v3/include/std/span index 251fed91abf..b336332b190 100644 --- a/libstdc++-v3/include/std/span +++ b/libstdc++-v3/include/std/span @@ -145,7 +145,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION constexpr span() noexcept - requires ((_Extent + 1u) <= 1u) + requires (_Extent == dynamic_extent || _Extent == 0) : _M_ptr(nullptr), _M_extent(0) { }