C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Standard Library types          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message Alex J. Dam Guest Posted: Wed Jan 28, 2004 9:54 pm    Post subject: Standard Library types Hi, I'm reposting this since I posted it as an answer and the topic changed a little (guess no one bothered looking at it). If I need to store the location of some data within a binary file, in that same binary file, should I store the pos_type value returned by ostream::teelp()? (That would be strange. I would be storing extra information, since I need only the position). I'm confused as to what types should be used when calling Standard Library functions, especially when mixing variables of different types, e.g., if I divide an off_type by a size_t, what do I get? Thanks. -- Alex J. Dam "Oh, I got plenty o' nuttin', an' nuttin's plenty fo' me" -- Porgy Back to top Victor Bazarov Guest Posted: Wed Jan 28, 2004 11:04 pm    Post subject: Re: Standard Library types "Alex J. Dam" <alexjdam (AT) yahoo (DOT) com.br> wrote... Quote: If I need to store the location of some data within a binary file, in that same binary file, should I store the pos_type value returned by ostream::teelp()? (That would be strange. I would be storing extra information, since I need only the position). I'm confused as to what types should be used when calling Standard Library functions, especially when mixing variables of different types, e.g., if I divide an off_type by a size_t, what do I get? I would say, you get off_type. If it's an arithmetic type, a value of that type retains its type no matter how you slice it or dice it. My solution was always simpler: since binary files are platform-specific (in most cases, anyway), then store the position as a long or unsigned long (or any other type that can accommodate the maximum size of the file). Once you retrieve it, convert it to the necessary off_type or pos_type or whatever. V Back to top Jonathan Turkanis Guest Posted: Thu Jan 29, 2004 3:27 am    Post subject: Re: Standard Library types "Alex J. Dam" <alexjdam (AT) yahoo (DOT) com.br> wrote Quote: Hi, I'm reposting this since I posted it as an answer and the topic changed a little (guess no one bothered looking at it). If I need to store the location of some data within a binary file, in that same binary file, should I store the pos_type value returned by ostream::teelp()? (That would be strange. I would be storing extra information, since I need only the position). I'm confused as to what types should be used when calling Standard Library functions, especially when mixing variables of different types, e.g., if I divide an off_type by a size_t, what do I get? Be aware that a stream's pos_type is not an intergral type, although it can be converted to one. In general, this conversion could loose information, although this may be unlikely with a stream in binary mode. Jonathan 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.