How do I use CTFE to generate an immutable associative array at compile time?

[Daniel Kozak via Digitalmars-d-learn]

Yes this is how I mean it.

Dne 22. 2. 2017 9:05 napsal uživatel "Jacob Carlborg via
Digitalmars-d-learn" <digitalmars-d-learn at puremagic.com>:

> On 2017-02-21 23:49, H. S. Teoh via Digitalmars-d-learn wrote:
>
> That may appear to work, but I would *strongly* recommend against it,
>> because what happens when you use enum with an AA, is that the AA will
>> be created *at runtime*, *every single time* it is referenced.  (It is
>> as if you copy-n-pasted the entire AA into the code each time you
>> reference the enum.)  Which will introduce ridiculous amounts of
>> redundant work at runtime and cause a big performance penalty.
>>
>
> You can use an enum to declare the AA and then assign it to an immutable
> variable using "static this". The you would only use to the immutable
> variable and never the enum.
>
> enum aa = [1 : 2];
>
> immutable int[int] iaa;
>
> static this()
> {
>     iaa = aa;
> }
>
> --
> /Jacob Carlborg
>
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