Casting away immutability

[via Digitalmars-d-learn]

On Friday, 4 September 2015 at 08:37:26 UTC, Kagamin wrote:
> 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[].
>
> If you can't write to it doesn't mean it won't change. Use 
> const for memory that you can't write to.

Note that you can however achieve immutability by using a 
_private_ read-only mapping.