From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 2745 invoked by alias); 27 Mar 2009 19:25:50 -0000 Mailing-List: contact archer-help@sourceware.org; run by ezmlm Sender: Precedence: bulk List-Post: List-Help: List-Subscribe: List-Id: Received: (qmail 2736 invoked by uid 22791); 27 Mar 2009 19:25:48 -0000 X-SWARE-Spam-Status: No, hits=-2.4 required=5.0 tests=AWL,BAYES_00,SPF_PASS X-Spam-Check-By: sourceware.org From: Pedro Alves To: Phil Muldoon Subject: Re: [python][rfc] Attempt to print the base class if a there is no Python pretty-printer for a derived class. Date: Fri, 27 Mar 2009 19:25:00 -0000 User-Agent: KMail/1.9.10 Cc: archer@sourceware.org, Tom Tromey References: <49CD0730.8070000@redhat.com> <200903271805.09768.pedro@codesourcery.com> <49CD23C5.1000605@redhat.com> In-Reply-To: <49CD23C5.1000605@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200903271925.45104.pedro@codesourcery.com> X-SW-Source: 2009-q1/txt/msg00435.txt.bz2 On Friday 27 March 2009 19:06:45, Phil Muldoon wrote: > Pedro Alves wrote: > > On Friday 27 March 2009 17:50:39, Tom Tromey wrote: > > > >> Pedro> Does this do sensible things if class Y has some > >> Pedro> fields that mask the Base class's ones, when you only have a > >> Pedro> pretty printer for Base? > >> > >> Yeah... it pretty-prints Base, then goes on to print the subclass > >> fields as usual (perhaps pretty-printing them as well). > >> > > > > Okay, I was concerned if the pretty printer for Base would > > access Y::x instead of Base::x > It is a printer for Base, but that does not mean it will print out the > Base values. Take this example: > I'm not sure if you're talking about what I'm talking. Here's a simple example without stl mumbo jumbo, but please don't get caught up with the actual classes being chosen for the example: class LibVector { private: char *data; int len; /* length of data buffer in bytes */ }; class MyApplesVector : public LibVector { private: int len; /* length of each apple in the vector in fruitlenght units. They all must have the same length. */ } I was asking if the pretty printer for LibVector, when applied to MyApplesVector, wouldn't mistake MyApplesVector::len for LibVector::len, which could cause bad things to happen when accessing data, or printing the length of the generic LibVector. -- Pedro Alves