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| NNTP-Posting-Date | Sat, 21 May 2011 08:42:08 -0500 |
| From | Pete Becker <pete@versatilecoding.com> |
| Organization | Roundhouse Consulting, Ltd. |
| Newsgroups | comp.lang.c++ |
| Date | Sat, 21 May 2011 09:42:08 -0400 |
| Message-ID | <2011052109420832334-pete@versatilecodingcom> (permalink) |
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| Subject | Re: Using sizeof in the preprocessor |
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On 2011-05-21 09:35:53 -0400, Johannes Schaub said: > I have this code in my pet project > > #if sizeof -1 > 4 > #error "This doesn't work on 64bit" > #endif > > My friend was telling me that this shouldn't work because "sizeof is not > evaluated in the preprocessor". Yet the compiler accepts it and my program > works. > > Can anybody please explain this? Is it a compiler bug? Thanks to all! Bug or extension. The preprocessor does text manipulation; it doesn't know anything about types (although it has its own set of rules for arithmetic). -- Pete Roundhouse Consulting, Ltd. (www.versatilecoding.com) Author of "The Standard C++ Library Extensions: a Tutorial and Reference (www.petebecker.com/tr1book)
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Using sizeof in the preprocessor Johannes Schaub <schaub.johannes@googlemail.com> - 2011-05-21 15:35 +0200
Re: Using sizeof in the preprocessor Pete Becker <pete@versatilecoding.com> - 2011-05-21 09:42 -0400
Re: Using sizeof in the preprocessor Huibert Bol <huibert.bol@quicknet.nl> - 2011-05-21 16:08 +0200
Re: Using sizeof in the preprocessor Pete Becker <pete@versatilecoding.com> - 2011-05-21 10:37 -0400
Re: Using sizeof in the preprocessor Juha Nieminen <nospam@thanks.invalid> - 2011-05-21 18:51 +0000
Re: Using sizeof in the preprocessor Huibert Bol <huibert.bol@quicknet.nl> - 2011-05-21 21:52 +0200
Re: Using sizeof in the preprocessor Johannes Schaub <schaub.johannes@googlemail.com> - 2011-05-21 21:54 +0200
Re: Using sizeof in the preprocessor Alain Ketterlin <alain@dpt-info.u-strasbg.fr> - 2011-05-21 21:54 +0200
Re: Using sizeof in the preprocessor Juha Nieminen <nospam@thanks.invalid> - 2011-05-22 06:02 +0000
Re: Using sizeof in the preprocessor Johannes Schaub <schaub.johannes@googlemail.com> - 2011-05-21 22:19 +0200
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