Memory allocation purity

[Andrei Alexandrescu via Digitalmars-d]

On 5/15/14, 3:31 AM, luka8088 wrote:
> Yeah, I read all about weak/string purity and I do understand the
> background. I was talking about strong purity, maybe I should pointed
> that out.
>
> So, to correct myself: As I understood strong purity implies
> memoization. Am I correct?

Yes, as long as you don't rely on distinguishing objects by address.

Purity of allocation is frequently assumed by functional languages 
because without it it would be difficult to get much work done. Then, 
most functional languages make it difficult or impossible to distinguish 
values by their address. In D that's easy. A D programmer needs to be 
aware of that, and I think that's fine.


Andrei