MESSAGE
| DATE | 2011-06-11 |
| FROM | Ruben Safir
|
| SUBJECT | Subject: [NYLXS - HANGOUT] (fwd) Re: Using sizeof in the preprocessor
|
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From: Ruben Safir
To: hangout-at-nylxs.com
Subject: [NYLXS - HANGOUT] (fwd) Re: Using sizeof in the preprocessor
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NNTP-Posting-Date: Sat, 21 May 2011 09:37:00 -0500
From: Pete Becker
Organization: Roundhouse Consulting, Ltd.
Newsgroups: comp.lang.c++
Date: Sat, 21 May 2011 10:37:00 -0400
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Xref: panix comp.lang.c++:1085108
On 2011-05-21 10:08:58 -0400, Huibert Bol said:
> Johannes Schaub wrote:
>
>> 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.
>
> Identifiers in #if expressions are evaluated as zero,
Good point.
--
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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