C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Casting (void*)&foo          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message Alex Vinokur Guest Posted: Tue Jun 20, 2006 9:10 am    Post subject: Casting (void*)&foo Is this approach safe? class Foo { // Stuff }; void func1 (void *) { // Do something } void func2 (const Foo& foo) { func1 ((void*)&foo); // Is this safe } Alex Vinokur email: alex DOT vinokur AT gmail DOT com http://mathforum.org/library/view/10978.html http://sourceforge.net/users/alexvn Back to top Robert J. Hansen Guest Posted: Tue Jun 20, 2006 9:10 am    Post subject: Re: Casting (void*)&foo Alex Vinokur wrote: Quote: Is this approach safe? Absolutely, for peculiar meanings of "safe". Some good rules of thumb: * A C-style cast is never safe. * A C-style cast to a void* is especially never safe. * A C-style cast that disregards a const qualifier is ridiculously especially never safe. * And a C-style cast that tries to... This approach is almost gratuitously unsafe. Please don't use this in any real-world code. There are certainly some specific instances where this approach is harmless, but in the main, this approach is just full of all different kinds of things to avoid. Back to top werasm Guest Posted: Wed Jun 21, 2006 9:10 am    Post subject: Re: Casting (void*)&foo Frederick Gotham wrote: Quote: The one major advantage of C style casts is they're not as laborious to type out: (int)val Versus: static_cast<int>(val) Hmmm, given. One major advantage of C++ style casts is that they're easy to find when looking for the source of your mistakes. Furthermore, they concise. They have responsibility. They give certain guarantees. An erroneous static_cast would fail to compile. C style casts compile regardless of human error, and all humans make errors. For that reason, I'll rather type .25 secs longer than look for a hard to find bug. Regards, Werner Quote: -- Frederick Gotham 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.