In the manual it athttps://www.freepascal.org/docs-html/ref/refse38.html it says "Calling the constructor will provoke a call to the virtual class method NewInstance, which, in its default implementation, calls GetMem, to allocate enough space to hold the class instance data, and then zeroes out the memory." I'm trying this like below but it crashes. Is this correct? The fact NewInstance returns TObject instead of Pointer doesn't make sense to me and suggests this isn't correct. class function TDataObject.NewInstance: TObject; begin result := TObject(GetMem(InstanceSize)); end; Regards, Ryan Joseph _______________________________________________ fpc-pascal maillist https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal

In the manual it at https://www.freepascal.org/docs-html/ref/refse38.html it says "Calling the constructor will provoke a call to the virtual class method NewInstance, which, in its default implementation, calls GetMem, to allocate enough space to hold the class instance data, and then zeroes out the memory." I'm trying this like below but it crashes. Is this correct? The fact NewInstance returns TObject instead of Pointer doesn't make sense to me and suggests this isn't correct. class function TDataObject.NewInstance: TObject; begin result := TObject(GetMem(InstanceSize)); end;

On Jun 4, 2024, at 7:06 PM, Sven Barth via fpc-pascal wrote: Hairy Pixels via fpc-pascal schrieb am Di., 4. Juni 2024, 10:54: In the manual it at https://www.freepascal.org/docs-html/ref/refse38.html it says "Calling the constructor will provoke a call to the virtual class method NewInstance, which, in its default implementation, calls GetMem, to allocate enough space to hold the class instance data, and then zeroes out the memory." I'm trying this like below but it crashes. Is this correct? The fact NewInstance returns TObject instead of Pointer doesn't make sense to me and suggests this isn't correct. class function TDataObject.NewInstance: TObject; begin result := TObject(GetMem(InstanceSize)); end; You also need to call TObject.InitInstance() on the allocated memory (that should probably be mentioned in the documentation...). Regards, Sven _______________________________________________ fpc-pascal maillist - https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal

In the manual it at https://www.freepascal.org/docs-html/ref/refse38.html it says "Calling the constructor will provoke a call to the virtual class method NewInstance, which, in its default implementation, calls GetMem, to allocate enough space to hold the class instance data, and then zeroes out the memory." I'm trying this like below but it crashes. Is this correct? The fact NewInstance returns TObject instead of Pointer doesn't make sense to me and suggests this isn't correct. class function TDataObject.NewInstance: TObject; begin result := TObject(GetMem(InstanceSize)); end; Regards, Ryan Joseph _______________________________________________ fpc-pascal maillist - https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal Return-Path: Received: from mail3.mwassocs.co.uk (mail3.mwassocs.co.uk [IPv6:2a00:da00:1800:8207:0:0:0:1]) by olympus.mwassocs.co.uk (8.17.1.9/8.17.1.9/Debian-2) with ESMTP id 454925ln001681 for ; Tue, 4 Jun 2024 10:02:13 +0100 Authentication-Results: mail3.mwassocs.co.uk; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=googlegroups.com header.a=rsa-sha256 header.s=20230601 header.b=QYUmS2JD; dkim-atps=neutral Received: from mwa2023.mwassocs.co.uk (localhost [127.0.0.1]) by mail3.mwassocs.co.uk (8.17.1.9/8.17.1.9/Debian-2) with ESMTPS id 4547BXql783561 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO) for ; 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[2a00:51c0::5fd7:bd14]) by gmr-mx.google.com with ESMTPS id ffacd0b85a97d-35dd0646e78si215661f8f.7.2024.06.04.00.11.21 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 04 Jun 2024 00:11:21 -0700 (PDT) Received-SPF: pass (google.com: domain of designates 2a00:51c0::5fd7:bd14 as permitted sender) client-ip=2a00:51c0::5fd7:bd14; Message-ID: DKIM-Filter: OpenDKIM Filter v2.11.0 smtp2.protagio.nl 8D10127A Date: Tue, 4 Jun 2024 09:11:20 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [firebird-devel] Schemas in Firebird - SYSTEM schema, migration from old versions and plugin objects To: References: Content-Language: en-US From: "'Mark Rotteveel' via firebird-devel" Organization: Me, myself and I In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed X-Original-Sender: X-Original-Authentication-Results: gmr-mx.google.com; dkim=pass header.s=protagio header.b=xOXklYHI; spf=pass (google.com: domain of designates 2a00:51c0::5fd7:bd14 as permitted sender) ; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=lawinegevaar.nl X-Original-From: Mark Rotteveel Reply-To: Precedence: list Mailing-list: list ; contact List-ID: <firebird-devel.googlegroups.com> X-Spam-Checked-In-Group: X-Google-Group-Id: 664696289522 List-Post: <https://groups.google.com/group/firebird-devel/post>, List-Help: <https://groups.google.com/support/>, List-Archive: <https://groups.google.com/group/firebird-devel List-Subscribe: <https://groups.google.com/group/firebird-devel/subscribe>, List-Unsubscribe: , <https://groups.google.com/group/firebird-devel/subscribe> X-Spam-Status: No, score=-2.3 required=5.0 tests=ARC_SIGNED,ARC_VALID, DKIMWL_WL_MED,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, DMARC_PASS,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE, SPF_PASS autolearn=unavailable autolearn_force=no version=4.0.0 X-Spam-Checker-Version: SpamAssassin 4.0.0 (2022-12-13) on mwa2023.mwassocs.co.uk Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by mail3.mwassocs.co.uk id 4547BUZr783552 On 03/06/2024 16:11, Денис Симонов wrote: > Why not make the default schema PUBLIC, like Postgresql does? > > Let all system tables be located in the SYSTEM schema. There are many > ways to solve backward compatibility problems, for example making all > current RDB$ tables views on the SYSTEM table, or aliases of objects > from the SYSTEM schema. In PostgreSQL, the system tables do not reside in public, but in pg_catalog. Mark