On 8 Jan 2011, at 11:22, Faré wrote: >>> 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 <p...@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).
I meant the dynamic environment, not the lexical environment. For example, ContextL provides a way to capture dynamic environments, but this requires using ContextL's binding constructs. Pascal -- Pascal Costanza, mailto:p...@p-cos.net, http://p-cos.net Vrije Universiteit Brussel Software Languages Lab Pleinlaan 2, B-1050 Brussel, Belgium _______________________________________________ pro mailing list pro@common-lisp.net http://common-lisp.net/cgi-bin/mailman/listinfo/pro
