On Mon, Sep 29, 2008 at 9:07 PM, David Cournapeau
<david@ar.media.kyoto-u.ac.jp> wrote:
Charles R Harris wrote:
>
> Thanks, that was very helpful. I wonder how widespread the less,
> lessequal, etc. macros are?
If it is C99, count on some platforms (MS in particular) to not do it.
Also, when doing things in C, beware that some compilers break most
reasonable expectations about floating points. In particular, x - x
where x is a NaN or inf will returns 0 with MS compilers with the
compiler flags currently used in python (/Ox), which breaks almost any
code out there relying on proper NaN/Inf handling. So if possible,
special case with isnan/isinf/isfinite
Do any of the MS compilers handle these things correctly? I am loath to load up the code with expensive macros just to deal with bass ackwards compilers. Especially if I have to special case all the infs also. However, if I can use ifdefs to compile various versions I could be talked into it. OTOH, we could just say the results are undefined when non-conforming compilers are used.
Chuck