[OT] my experience with nullable types (C#)

[user1234]

On Wednesday, 7 May 2025 at 07:32:17 UTC, user1234 wrote:
> On Wednesday, 7 May 2025 at 07:08:43 UTC, Python wrote:
>> BTW, NET10 will have a new operator, the null check assignment:
>>
>>
>> `someRef?.Prop = 10` will be shorthand for:
>>
>> ```
>> if (someRef != null)
>>   someRef.Prop = 10;
>> ```
>
> Curious, I'd rather would have implemented that using an hidden 
> alloca:
>
> ```
> PropType __tmp;
> (someRef ? someRef.Prop : __tmp) = 10;
> ```
>
> Actually having `?.` implemented to yield a hidden value when 
> the LHS evaluates to false would have made the assignment case 
> already working since years.

Forgot to say: this design may lead to think "the compiler will 
generate a useless alloca + assignment". Indeed, but dont forget 
that optimizing compilers are good at droping these ;)

That's how it's implemented in styx. But prior to that the 
concept was proved with a D template, that is still used in 
D-Scanner codebase I believe.