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From: Szabolcs Nagy <nsz@port70.net>
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Subject: Re: Explicit casts in ctype.h suppress compiler warnings
Date: Fri, 17 Apr 2015 21:43:24 +0200
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* Szabolcs Nagy <nsz@port70.net> [2015-04-17 20:35:12 +0200]:
> > I admit I was thinking of doing isspace-style inlines everywhere, but thanks
> > to your suggestion I was able to come up with this:
> > 
> > static __inline void __is_int(int a) {}
> > #define isdigit(a) (__is_int(0?(a):0), ((unsigned)(a)-'0') < 10)
> > 
> 
> i think using :0 there is not useful because null
> pointer constants are special in ?:
> 

ah i see what you are doing there now

meanwhile i tested that (__extension__ (unsigned){a})
is accepted without warning in c89 mode