[squeak-dev] Re: The Trunk: Kernel-eem.474.mcz
nicolas.cellier.aka.nice at gmail.com
Fri Jul 23 20:29:02 UTC 2010
2010/7/23 Levente Uzonyi <leves at elte.hu>:
> On Fri, 23 Jul 2010, Tobias Pape wrote:
>> Am 2010-07-23 um 07:39 schrieb Andreas Raab:
>>> However, I do take Travis' point about compile time expressions. Here the
>>> whole point is that you really want the expression to be reevaluated when
>>> the defining code changes which is not easily done the above (it's possible
>>> but bothersome).
>> I think its good to point out that it is possible to
>> differentiate between one-time-expressions
>> and compile-time expressions. I think an expression
>> executed once, however, not at compile time can make
>> a pretty good lazy initializer in the sense you mentioned.
>> Alas, I must admit that I?m not aware of an example that
>> cannot be equally good expressed with the ?ifNil: variant
>> as with the  once variant.
> Seaside 2.8 uses a literal array with a single element for this to cache
> files. It works something like this:
> | array |
> array := #(nil).
> ^(array at: 1) ifNil: [
> array at: 1 put: 'alongbase64string' decodeBase64 ]
> These selectors are auto-generated. I think #once is (would be) a better
> solution. It could be hardly done with class (instance) variables.
Hmm I did same trick long time ago...
How do they have it working in VW with immutable literals ?
>> So Long,
More information about the Squeak-dev