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From "Roy T. Fielding" <field...@gbiv.com>
Subject Re: svn commit: r651704 - in /apr/apr/trunk: file_io/unix/copy.c include/arch/netware/apr_arch_file_io.h include/arch/os2/apr_arch_file_io.h include/arch/unix/apr_arch_file_io.h include/arch/win32/apr_arch_file_io.h
Date Fri, 25 Apr 2008 22:42:22 GMT
On Apr 25, 2008, at 3:20 PM, Bojan Smojver wrote:
> On Sat, 2008-04-26 at 08:07 +1000, Bojan Smojver wrote:
>
>>> I'm not sure that is portable C.  Is the compiler guaranteed to
>>> optimize that
>>> into a constant?
>>
>> I would think so. BUFSIZ is defined as constant, as well as
>> APR_FILE_DEFAULT_SIZE. But, I'll check again...
>
> The book says that such expressions _may_ be evaluated during
> compilation. So, I guess it is not guaranteed (I would think any  
> modern
> compiler would do it, though).
>
> If you wish, I can have the classic #if (the one I did in header files
> before) in copy.c. That should make it clear.

I just checked by K&R 1st edition and it allows constants
"possibly connected" by the ternary operator.  So, unless we find a
specific compiler that doesn't accept it, I think we can leave it as is.

....Roy


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