From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 1530 invoked by alias); 11 Nov 2016 05:49:39 -0000 Mailing-List: contact gdb-patches-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-patches-owner@sourceware.org Received: (qmail 585 invoked by uid 89); 11 Nov 2016 05:49:38 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.4 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_NONE,RCVD_IN_SORBS_SPAM,SPF_PASS autolearn=no version=3.3.2 spammy=HTo:U*palves X-HELO: gproxy9-pub.mail.unifiedlayer.com Received: from gproxy9-pub.mail.unifiedlayer.com (HELO gproxy9-pub.mail.unifiedlayer.com) (69.89.20.122) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with SMTP; Fri, 11 Nov 2016 05:47:03 +0000 Received: (qmail 10145 invoked by uid 0); 11 Nov 2016 05:47:01 -0000 Received: from unknown (HELO cmgw4) (10.0.90.85) by gproxy9.mail.unifiedlayer.com with SMTP; 11 Nov 2016 05:47:01 -0000 Received: from box522.bluehost.com ([74.220.219.122]) by cmgw4 with id 6Vmx1u00p2f2jeq01Vn04u; Thu, 10 Nov 2016 22:47:01 -0700 X-Authority-Analysis: v=2.1 cv=fZg+lSgF c=1 sm=1 tr=0 a=GsOEXm/OWkKvwdLVJsfwcA==:117 a=GsOEXm/OWkKvwdLVJsfwcA==:17 a=L9H7d07YOLsA:10 a=9cW_t1CCXrUA:10 a=s5jvgZ67dGcA:10 a=L24OOQBejmoA:10 a=20KFwNOVAAAA:8 a=-sv3lUnWm4eWt26wkCcA:9 a=e_O65bzb51kRm2y5VmPK:22 Received: from 174-16-143-211.hlrn.qwest.net ([174.16.143.211]:56058 helo=bapiya) by box522.bluehost.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.86_1) (envelope-from ) id 1c54fx-0003Ai-E8; Thu, 10 Nov 2016 22:46:57 -0700 From: Tom Tromey To: Pedro Alves Cc: Tom Tromey , gdb-patches@sourceware.org Subject: Re: [RFA 00/14] add a smart pointer for PyObject* References: <1478497656-11832-1-git-send-email-tom@tromey.com> <7f51de8d-912c-01d9-815f-85cc3c351f0c@redhat.com> <87wpgaitam.fsf@tromey.com> Date: Fri, 11 Nov 2016 05:49:00 -0000 In-Reply-To: (Pedro Alves's message of "Fri, 11 Nov 2016 04:03:12 +0000") Message-ID: <87shqyin5j.fsf@tromey.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-BWhitelist: no X-Exim-ID: 1c54fx-0003Ai-E8 X-Source-Sender: 174-16-143-211.hlrn.qwest.net (bapiya) [174.16.143.211]:56058 X-Source-Auth: tom+tromey.com X-Email-Count: 2 X-Source-Cap: ZWx5bnJvYmk7ZWx5bnJvYmk7Ym94NTIyLmJsdWVob3N0LmNvbQ== X-SW-Source: 2016-11/txt/msg00286.txt.bz2 >>>>> "Pedro" == Pedro Alves writes: > gdbpy_reference sort_func = module.GetAttrString > ("execute_frame_filters"); Pedro> I think that theory is incorrect. If module.GetAttrString() returns a Pedro> gdbpy_reference, then RVO kicks in and no copy is made at all. What happened is that I misread your example as just changing an initializer to an assignment -- not seeing that in fact the first one was also positing that the function would be returning a gdbpy_reference. Which I should have realized since you explicitly said that somewhere... Pedro> There's another safety advantage to having functions return Pedro> gdbpy_references directly. I completely agree. Tom