Casting away immutability

[Mike Parker via Digitalmars-d-learn]

On Thursday, 3 September 2015 at 13:28:54 UTC, Sergei Degtiarev 
wrote:

> Agree, however, memory obtained with mmap(..., PROT_READ, ..); 
> is essentially read-only and any attempt to write to it will 
> cause immediate crash with segmentation violation. It would be 
> very desirable in this case to return something that could be 
> cast to immutable(type)[] but not type[].
> This is what I tried to find out. Thank you for the help.

immutable(T)[] getGetData(T)() {
     return cast(immutable(T)[])data;
}

...

auto ints = obj.getData!int;