food for thought - swift 5 released - bottom types, string interpolation, and stuff.

[lithium iodate]

On Sunday, 14 April 2019 at 15:01:22 UTC, Julian wrote:
> On Sunday, 14 April 2019 at 13:28:13 UTC, lithium iodate wrote:
>> On Sunday, 14 April 2019 at 13:23:27 UTC, Adam D. Ruppe wrote:
>>> On Sunday, 14 April 2019 at 13:19:22 UTC, lithium iodate 
>>> wrote:
>>>> I personally would expect bitwise operations to operate on 
>>>> the underlying bit pattern instead of its two's-complement 
>>>> equivalent representation.
>>>
>>> Aren't those the same thing?
>>
>> For the inbuilt integral types? Sure. For custom integral 
>> types? Not necessarily.
>> When dealing with protocols and compression you might get into 
>> the situation of defining an integer with some special coding 
>> as internal representation.
>
> How would adding isOdd to phobos change this?

By selecting suitable treatment for the given type:
    inbuilt integer -> &1 (or whatever)
    does it provide a isOdd function? -> call isOdd of that type
    perhaps it somehow declared that oddity can't be determined -> 
fail fast and loud
    else try %2 != 0
    else fail fast and loud
none of which include making possibly incorrect assumptions about 
its representation.