opCmp with template type not working.
SeeWebsiteForEmail at erdani.org
Tue Nov 3 13:49:04 UTC 2020
On 11/3/20 8:48 AM, Andrei Alexandrescu wrote:
> On 11/3/20 1:56 AM, ag0aep6g wrote:
>> On 03.11.20 04:07, user1234 wrote:
>>> opCmp should return a signed integer. This allows to match well with
>>> the x86 flag register and do fast comparison with integers types (in
>>> which case just substract rhs to lhs and you're good)
>> Doing comparison by subtracting is a cute idea, but it doesn't
>> actually work in general because of wraparound.
>> Example: int.min < 1, but int.min - 1 > 0.
> druntime does it for integrals smaller than int. For others, you can do:
> return (a > b) - (b < a);
return (a > b) - (a < b);
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