BitArray Slicing

[Ezneh via Digitalmars-d-learn]

Hi, in one of my projects I have to get a slice from a BitArray.

I am trying to achieve that like this :

void foo(BitArray ba)
{
    auto slice = ba[0..3]; // Assuming it has more than 4 elements
}

The problem is that I get an error :

"no operator [] overload for type BitArray".

Is there any other way to get a slice from a BitArray ?

Thanks,
Ezneh.