Pattern matching via switch?

[12345swordy]

On Sunday, 15 March 2020 at 17:55:59 UTC, Steven Schveighoffer 
wrote:
> On 3/14/20 3:04 PM, 12345swordy wrote:
>> I.E.
>> 
>> switch (object)
>>      case Type1 t1:
>>      case Type2 t2:
>>      case Type3 t3:
>> 
>
> Is this a class object and you are trying to determine at 
> runtime which derived type it is and perform an action based on 
> that? Or are you trying to switch on the type of a concrete 
> item?
>
> It should technically be possible to use the fully qualified 
> name to switch on, but I don't think typeid(Type1).name is 
> usable as a switch label.
>
> -Steve

https://docs.microsoft.com/en-us/dotnet/csharp/pattern-matching

It is an example from c#.
object is the top type in that language.
https://en.wikipedia.org/wiki/Top_type