Possible way to achieve lazy loading with const objects

[Peter Alexander]

On 26/09/11 8:02 PM, Steven Schveighoffer wrote:
> I think a better avenue would be to implement some sort of strong-pure
> memoization system. Then all you have to do is make an immutable pure
> member, and the compiler will take care of the rest for you.

How can the compiler possibly figure out the best way to cache things 
for you?

Or have I misunderstood?