string to char array?

[Kyoji Klyden via Digitalmars-d-learn]

On Wednesday, 3 June 2015 at 10:28:50 UTC, Marc Schütz wrote:
>
> A string (or any other array slice for that matter) is 
> internally the equivalent of:
>
>     struct Slice(T) {
>         T* ptr;
>         size_t length;
>     }
>
> (maybe the order of fields is different, I never remember that 
> part)
>
> `&source` will give you the address of that structure.

hmm I still a bit confused..

So in "const char* sources = source.ptr;" sources is just turning 
the property ptr of source into a variable, and then in 
glShaderSource you're passing the memory address of sources 
(which is technically source.ptr) to the function?

Do I have that right? If I do, then I think this all makes sense