[webkit-dev] !!Tests for equality comparison

Carlos Garcia Campos carlosgc at webkit.org
Thu Apr 27 22:32:53 PDT 2017

El jue, 27-04-2017 a las 16:06 -0700, JF Bastien escribió:
> Hello C++ fans!
> The C++ style check currently say:
> Tests for true/false, null/non-null, and zero/non-zero should all be
> done without equality comparisons
> I totally agree for booleans and pointers… but not for integers. I
> know it’s pretty much the same thing, but I it takes me slightly
> longer to process code like this:
> int numTestsForEqualityComparison = 0:
> // Count ‘em!
> // …
> if (!numTestsForEqualityComparison)
>   printf(“Good job!”);
> I read it as “if not number of tests for equality comparison”. That's
> weird. It takes me every slightly longer to think about, and I’ve
> gotten it wrong a bunch of times already. I’m not trying to check for
> “notness", I’m trying to say “if there were zero tests for equality
> comparison”, a.k.a.:
> if (numTestsForEqualityComparison == 0)
>   printf(“Good job!”);
> So how about the C++ style let me just say that? I’m not suggesting
> we advise using that style for integers everywhere, I’m just saying
> it should be acceptable to check zero/non-zero using equality
> comparison.

I agree, it's also quite confusing when using strcmp, because !strcmp
means the strings are equal. It's not only more difficult to read, I've
seen patches with wrong strcmp checks because of that.

> !!Thanks (i.e. many thanks),
> JF
> p.s.: With you I am, fans of Yoda comparison, but for another day
> this will be.
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