[pro] Initialization of shared slots

[Svante Carl v. Erichsen]

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Hi!

Am 08.01.2011 11:22, schrieb Faré:
>>> Daniel Weinreb wrote:
>>> - however, nothing tells us that the resulting value is used immediately
>>>  to initialize the slot (it could just be stored somewhere), and
>>>  implementations seem to be free to do so right now, or later when the
>>>  first instance is created.
>>
>> Pascal Costanza <pc at p-cos.net> wrote:
>> - When a class is defined for the first time, the :initform for a
>>   shared slot needs to be evaluated immediately, and its result must
>>   be stored in some temporary memory location. (There is no notion of
>>   first-class dynamic environments in Common Lisp, so there is no
>>   other way of ensuring that the :initform can be evaluated in the
>>   correct dynamic environment.)
>
> No. You may immediately capture the lexical environment in a closure
> `(lambda () ,initform).

But that does not keep the /dynamic/ environment, as required by the
DEFCLASS specification.  Am I missing something obvious?

Best wishes
Svante
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