C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Multiple inheritance and destructors          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message Christopher Benson-Manica Guest Posted: Thu Feb 26, 2004 2:03 pm    Post subject: Multiple inheritance and destructors Okay, having purchased the excellent Josuttis book last night, I've almost got my little streambuf subclass bit worked out. Now, though, I'm faced with some issues with the destructors... public TRFileStream : public TLSFile, public std::streambuf { ... }; The problem, I think, is that ~TLSFile is *not* virtual, but ~std::streambuf is. How can I reconcile these two destructors? -- Christopher Benson-Manica | I *should* know what I'm talking about - if I ataru(at)cyberspace.org | don't, I need to know. Flames welcome. Back to top John Harrison Guest Posted: Thu Feb 26, 2004 2:15 pm    Post subject: Re: Multiple inheritance and destructors "Christopher Benson-Manica" <ataru (AT) nospam (DOT) cyberspace.org> wrote Quote: Okay, having purchased the excellent Josuttis book last night, I've almost got my little streambuf subclass bit worked out. Now, though, I'm faced with some issues with the destructors... public TRFileStream : public TLSFile, public std::streambuf { ... }; The problem, I think, is that ~TLSFile is *not* virtual, but ~std::streambuf is. How can I reconcile these two destructors? Not sure there is a problem with that. What problem are you actually seeing? john Back to top Christopher Benson-Manica Guest Posted: Thu Feb 26, 2004 2:22 pm    Post subject: Re: Multiple inheritance and destructors John Harrison <john_andronicus (AT) hotmail (DOT) com> spoke thus: Quote: Not sure there is a problem with that. What problem are you actually seeing? Well, with no destructor declared in the function, I'm told Virtual function '_fastcall TWFileStream::~TWFileStream()' conflicts with base class 'streambuf' (note the Borland-specific __fastcall qualifier, which I perhaps unwisely did not mention in my original post) I get the same error if I attempt to specify a destructor like this: __fastcall ~TWFileStream() {;} //or, alternatively virtual __fastcall ~TWFileStream() {;} And if I specify it thus (in an attempt to placate std::streambuf): virtual ~TWFileStream() {;} Virtual function 'TWFileStream::~TWFileStream()' conflicts with base class 'TLSFile' Is this stupid Borland qualifier going to ruin what could otherwise be a wonderful piece of code? I'd appreciate any ideas... -- Christopher Benson-Manica | I *should* know what I'm talking about - if I ataru(at)cyberspace.org | don't, I need to know. Flames welcome. Back to top John Harrison Guest Posted: Thu Feb 26, 2004 2:49 pm    Post subject: Re: Multiple inheritance and destructors "Christopher Benson-Manica" <ataru (AT) nospam (DOT) cyberspace.org> wrote Quote: John Harrison <john_andronicus (AT) hotmail (DOT) com> spoke thus: Not sure there is a problem with that. What problem are you actually seeing? Well, with no destructor declared in the function, I'm told Virtual function '_fastcall TWFileStream::~TWFileStream()' conflicts with base class 'streambuf' (note the Borland-specific __fastcall qualifier, which I perhaps unwisely did not mention in my original post) I get the same error if I attempt to specify a destructor like this: __fastcall ~TWFileStream() {;} //or, alternatively virtual __fastcall ~TWFileStream() {;} And if I specify it thus (in an attempt to placate std::streambuf): virtual ~TWFileStream() {;} Virtual function 'TWFileStream::~TWFileStream()' conflicts with base class 'TLSFile' Is this stupid Borland qualifier going to ruin what could otherwise be a wonderful piece of code? I'd appreciate any ideas... -- Christopher Benson-Manica | I *should* know what I'm talking about - if I ataru(at)cyberspace.org | don't, I need to know. Flames welcome. Well I have no idea about the Borland bit (ask on a Borland newsgroup, details from their community web page)but since TLSFile doesn't seem to have been designed for inheritance perhaps you could recode class TWFileStream : public std::streambuf { ... private: TLSFile m_file; }; Tedious since you'll have to wrap the entire TLSFile interface, but maybe it'll work. john Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         C++Talk.NET Forum Index -> C++ language (comp.lang.c++) All times are GMT Page 1 of 1   Jump to: Select a forum C/C++----------------C LanguageC Language (Moderated)C++ Language (Moderated)C++ language (comp.lang.c++)C++ language, library and standards Non-English C/C++ Newsgroups----------------C++ (German)C++ (French)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.