From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by sourceware.org (Postfix) with ESMTPS id 7C87A385B51F for ; Tue, 10 Jan 2023 11:47:09 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 7C87A385B51F Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673351229; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=ljGqe42JxiPvjAYxxyM3xzdk1M9v2YSPTpKA2IvtjPk=; b=BB2O5Ia1FqCvhuXirzPnUyllGYYVa9bY89w15/ULcsx8s1sQRmxB1gk49ZNqV3o5QcclWL ORfDQsY1BH99ZfJFJZSKrfWUgBXD9BLYJfuJ92I5ydCS4xLlZZIInkM+AWxwuZl1+rsf5o lNTSEOjAQEaIduXJu1PajVor2TtVV48= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-149-_IIYwdI4MumDYQiPD9yMew-1; Tue, 10 Jan 2023 06:46:58 -0500 X-MC-Unique: _IIYwdI4MumDYQiPD9yMew-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 129E829DD989; Tue, 10 Jan 2023 11:46:58 +0000 (UTC) Received: from localhost (unknown [10.33.36.192]) by smtp.corp.redhat.com (Postfix) with ESMTP id CB5322166B26; Tue, 10 Jan 2023 11:46:57 +0000 (UTC) From: Jonathan Wakely To: libstdc++@gcc.gnu.org, gcc-patches@gcc.gnu.org Subject: [committed 1/3] libstdc++: Fix std::span constraint for sizeof(size_t) < sizeof(int) [PR108221] Date: Tue, 10 Jan 2023 11:46:55 +0000 Message-Id: <20230110114657.636853-1-jwakely@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.6 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-12.2 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,GIT_PATCH_0,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE,TXREP autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: Tested x86_64-linux. Pushed to trunk. -- >8 -- 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. --- 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) { } -- 2.39.0