On Thu, Jul 22, 2010 at 7:57 PM, Andreas Raab <andreas.raab at gmx.de> wrote:

> On 7/22/2010 6:26 PM, Eliot Miranda wrote:
>
>> The VW implementation relies on "clean
>> blocks" where the compiler creates a literal block provided the block
>> doesn't reference its outer environment.
>>
>
> I see. Sounds like a hack :-) What's wrong with the straightforward:
>
> someResource
>        ^SomeResource ifNil:[self initializeSomeResource]
>
> ? It explicitly documents that there is a shared resource by naming it
> which is a good thing in my understanding.
>

What's "wrong", or at least not as nice, is the variable and its
declaration.   The [expr] once form is entirely self-contained whereas the
SomeResource ifNil: [self initializeResource] is accompanied with a variable
declaration somewhere else.  I also like (but haven't seen used) the notion
of having variations on once such as onceInEverySession which can again
provide the necessary void-on-startup hook without any explicit registering
in a start-up list.

I do take your point about it being a hack, but its a neat hack.


> Cheers,
>  - Andreas


best
Eliot
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