What is difference between struct and class?

[Rnd]

On Monday, 3 June 2019 at 00:47:27 UTC, Adam D. Ruppe wrote:
> On Monday, 3 June 2019 at 00:17:08 UTC, Rnd wrote:
>> What additional features do classes offer in D?
>
> Classes support built-in runtime polymorphism through 
> inheritance. structs don't.
>
> As a result of this, classes are a little bit heavier 
> resource-wise and are semantically always object references.

I am not clear if structs can have constructors (this) and 
whether they can be multiple? Also can data be made private and 
getters and setters used to access them?