opCmp with template type not working.

Andrei Alexandrescu SeeWebsiteForEmail at erdani.org
Tue Nov 3 13:48:35 UTC 2020

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);

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