From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 26292 invoked by alias); 24 Sep 2013 21:49:46 -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 Received: (qmail 26036 invoked by uid 48); 24 Sep 2013 21:49:43 -0000 From: "redi at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/36587] Feature: add warning for constructor call with discarded return. Date: Tue, 24 Sep 2013 21:49:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c++ X-Bugzilla-Version: 4.1.1 X-Bugzilla-Keywords: X-Bugzilla-Severity: enhancement 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-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2013-09/txt/msg01729.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36587 --- Comment #8 from Jonathan Wakely --- (In reply to Johannes Schaub from comment #7) > Jonathan, unfortunately that code won't create and discard a temporary > object, Yes, you're right, there's no temporary so it's not relevant to this PR. (Although your "whatever that means" assumes my example used std::lock_guard, but if that was the case I'd have needed to use some template arguments. Other scoped-lock types are DefaultConstructible, e.g. std::unique_lock)