From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 15036 invoked by alias); 13 Mar 2011 12:24:38 -0000 Received: (qmail 15026 invoked by uid 22791); 13 Mar 2011 12:24:36 -0000 X-SWARE-Spam-Status: No, hits=-2.8 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00 X-Spam-Check-By: sourceware.org Received: from localhost (HELO gcc.gnu.org) (127.0.0.1) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Sun, 13 Mar 2011 12:24:17 +0000 From: "redi at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug libstdc++/48101] obscure error message with std::set X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: libstdc++ X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: redi at gcc dot gnu.org X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 Date: Sun, 13 Mar 2011 12:24:00 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org X-SW-Source: 2011-03/txt/msg01312.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48101 --- Comment #1 from Jonathan Wakely 2011-03-13 12:24:13 UTC --- Do you have a suggestion for a better error? We could use a static_assert in std::allocator to reject const T As far as I can see, the reason the code is invalid is exactly the reason given: std::allocator can't be instantiated with const T. I don't think it's invalid to default construct a set::set with a const value_type, as long as don't use std::allocator.