Search for, o/w create element for AA

[Moritz Maxeiner via Digitalmars-d-learn]

On Monday, 19 June 2017 at 15:19:19 UTC, Q. Schroll wrote:
> I have to lookup x twice and it seems that there is no way 
> around it. Can't I tell the AA to set a value for a given key 
> if it doesn't already have one
>  (1) with only one lookup, and
>  (2) in a safe way?

AFAIK the builtin associate array implementation exposes neither 
such a function, nor other functions which you can use to 
assemble this, so no, you cannot do this with only one lookup 
(currently).
Though I can't see why it couldn't be added, seems fairly 
straight forward.
The best you can do with the builtin associative arrays right now 
is make sure that the `toHash` of your key type is cached.