C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  un - using namespace?          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message Gernot Frisch Guest Posted: Wed Feb 09, 2005 2:11 pm    Post subject: un - using namespace? hi, for terrible reasons my stdafx.h has: using namepsace std; in it. Now, how can I "un-use the namespace in a cpp file, that _must_ include this header? -- -Gernot int main(int argc, char** argv) {printf ("%silto%c%cf%cgl%ssic%ccom%c", "ma", 58, 'g', 64, "ba", 46, 10);} Back to top Karl Heinz Buchegger Guest Posted: Wed Feb 09, 2005 2:52 pm    Post subject: Re: un - using namespace? Gernot Frisch wrote: Quote: hi, for terrible reasons my stdafx.h has: using namepsace std; in it. Now, how can I "un-use the namespace in a cpp file, that _must_ include this header? You can't That's one reason why using a 'using'-directive is a really bad idea in a header file. -- Karl Heinz Buchegger [email]kbuchegg (AT) gascad (DOT) at[/email] Back to top Peter Koch Larsen Guest Posted: Wed Feb 09, 2005 3:24 pm    Post subject: Re: un - using namespace? "Gernot Frisch" <Me (AT) Privacy (DOT) net> skrev i en meddelelse news:36ujstF550admU1 (AT) individual (DOT) net... Quote: hi, for terrible reasons my stdafx.h has: using namepsace std; in it. Now, how can I "un-use the namespace in a cpp file, that _must_ include this header? Why not just remove that using directive? You might have to clean-up some code, but it should not be that difficult and will give cleaner code afterwards. An alternative would be to properly qualify the call in the cpp-file. /Peter Quote: -- -Gernot int main(int argc, char** argv) {printf ("%silto%c%cf%cgl%ssic%ccom%c", "ma", 58, 'g', 64, "ba", 46, 10);} Back to top Default User Guest Posted: Wed Feb 09, 2005 6:36 pm    Post subject: Re: un - using namespace? Peter Koch Larsen wrote: Quote: "Gernot Frisch" <Me (AT) Privacy (DOT) net> skrev i en meddelelse news:36ujstF550admU1 (AT) individual (DOT) net... hi, for terrible reasons my stdafx.h has: using namepsace std; in it. Now, how can I "un-use the namespace in a cpp file, that _must_ include this header? Why not just remove that using directive? You might have to clean-up some code, but it should not be that difficult and will give cleaner code afterwards. An alternative would be to properly qualify the call in the cpp-file. stdafx.h is a implementation header for Visual Studio and maybe other inplementations, so I wouldn't recommend changing it. However, searching my VS6.0 files doesn't find a using statement in stdafx.h. I haven't found it necessary to use this, although it may be required for MFC or other off-topic stuff. Many people include it reflexively because certain help files seem to do so. The OP could try taking out that header and just including the ones actually needed. Brian Back to top Julie Guest Posted: Wed Feb 09, 2005 7:35 pm    Post subject: Re: un - using namespace? Karl Heinz Buchegger wrote: Quote: Gernot Frisch wrote: hi, for terrible reasons my stdafx.h has: using namepsace std; in it. Now, how can I "un-use the namespace in a cpp file, that _must_ include this header? You can't That's one reason why using a 'using'-directive is a really bad idea in a header file. and, further, I think that 'using' is just plain bad. Really, it is a band-aid fix to lazy programmers and code clutter. Back to top Jordan Stewart Guest Posted: Thu Feb 10, 2005 12:31 am    Post subject: Re: un - using namespace? Gernot Frisch wrote: Quote: hi, for terrible reasons my stdafx.h has: using namepsace std; in it. Now, how can I "un-use the namespace in a cpp file, that _must_ include this header? -- -Gernot int main(int argc, char** argv) {printf ("%silto%c%cf%cgl%ssic%ccom%c", "ma", 58, 'g', 64, "ba", 46, 10);} You could consider surrounding the #include directive with another namespace (if you don't consider that just as bad). Jordan Back to top Peter Koch Larsen Guest Posted: Thu Feb 10, 2005 12:37 am    Post subject: Re: un - using namespace? "Default User" <defaultuserbr (AT) yahoo (DOT) com> skrev i en meddelelse news:1107974168.851866.142790 (AT) c13g2000cwb (DOT) googlegroups.com... Quote: Peter Koch Larsen wrote: "Gernot Frisch" <Me (AT) Privacy (DOT) net> skrev i en meddelelse news:36ujstF550admU1 (AT) individual (DOT) net... hi, for terrible reasons my stdafx.h has: using namepsace std; in it. Now, how can I "un-use the namespace in a cpp file, that _must_ include this header? Why not just remove that using directive? You might have to clean-up some code, but it should not be that difficult and will give cleaner code afterwards. An alternative would be to properly qualify the call in the cpp-file. stdafx.h is a implementation header for Visual Studio and maybe other inplementations, so I wouldn't recommend changing it. However, searching my VS6.0 files doesn't find a using statement in stdafx.h. I haven't found it necessary to use this, although it may be required for MFC or other off-topic stuff. Many people include it reflexively because certain help files seem to do so. The OP could try taking out that header and just including the ones actually needed. Brian I believe stdafx.h is the name automatically used for precompiled headers. I do not use it either. There's nothing wrong with modifying it, however. Just add the often-used headers and enjoy the benefit (if there is one of having your own headers compiled as quickly as the windows.h-header (and the stream-headers, if i remember correctly). Apart from that: if the header is not used, there's certainly no problem removing it. /Peter Back to top James Aguilar Guest Posted: Thu Feb 10, 2005 3:13 am    Post subject: Re: un - using namespace? "Julie" <julie (AT) nospam (DOT) com> wrote Quote: and, further, I think that 'using' is just plain bad. Really, it is a band-aid fix to lazy programmers and code clutter. Or for programmers who don't want to waste their time typing redundant characters. What is the generally accepted idiom for these kinds of things? OnceAndOnlyOnce: http://www.c2.com/cgi/wiki?OnceAndOnlyOnce. Maybe you should say, "Three strikes and you 'using,'" that is, you can "use" a namespace once you use it three or more times, but less than that is lazy. - JFA1 Back to top Stefan Strasser Guest Posted: Thu Mar 24, 2005 3:12 am    Post subject: Re: un - using namespace? Jordan Stewart schrieb: Quote: You could consider surrounding the #include directive with another namespace (if you don't consider that just as bad). that doesn't work with a lot of headers because they use global scope qualifiers: struct A{ struct A{ ::A *a; } }; 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.