std.sumtype?

[JN]

On Monday, 22 March 2021 at 20:43:12 UTC, Imperatorn wrote:
> On Monday, 22 March 2021 at 19:24:54 UTC, JN wrote:
>> On Thursday, 18 March 2021 at 14:42:03 UTC, Oleg B wrote:
>>> Hello everyone.
>>>
>>> Went to see what is being prepared in the new compiler and 
>>> saw this
>>> https://dlang.org/changelog/pending.html#std-sumtype
>>
>> Does anyone know if it would be possible to make it support 
>> (it doesn't support it now) this kind of syntax:
>>
>> Temperature t1 = Fahrenheit(98.6);
>> isFahrenheit(t1); // works
>> isFahrenheit(Fahrenheit(98.6)); // doesn't work :(
>
> Not that it really makes sense, but if you wanted to do that 
> you could cast:
>
> isFahrenheit(cast(Temperature)Fahrenheit(98.6)) //works
>
> Otherwize you would have to rewrite isFahrenheit

isFahrenheit(Temperature(Fahrenheit(98.6)))

works too. but that's still extra typing.