Checking a (base) type and accepting any specialization?

[mitgedanken]

On Sunday, 8 June 2025 at 22:37:23 UTC, Andy Valencia wrote:
> On Sunday, 8 June 2025 at 14:29:27 UTC, mitgedanken wrote:
>> [...]
>
> I know OO is mostly looked down upon, but if you have a common 
> root class and each subclass specializes, you can have a 
> variable of the root class' type and it'll store pointers to 
> either.
>
> Andy

I know how to use OO; i just wanted to know if there is a way 
with templates and others.

Thanks to y'all.