cpus-caddr

0 more years after that. Message passing was added on or around 03/09/79, and things got quickly adjusted and flushed after that. MMCM@MIT-AI 03/09/79 21:26:00 To: (BUG LISPM) at MIT-AI Band 6 on CADR1 is a new experimental world load. In addition to quite a few accumulated changes, this load has some important changes to the message passing stuff. CLASS-CLASS now has three instance variables where formerly it had two. Most importantly, instead of the SELECT-METHOD being in the function cell of the xxx-CLASS symbol (typically) there is now a gensym (called the CLASS-METHOD-SYMBOL) created for each instance of CLASS-CLASS which holds the select-method. The CLASS-METHOD-SYMBOL for a given class can be obtained by sending the class a :CLASS-METHOD-SYMBOL message. A forthcomming essay will describe the motovation for doing this, etc. For the present, I note some incompatibilities and changes to operating procedure which this makes necessary. Incompatibilites: (1) The <-AS macro has been changed, and any file which uses it must be recompiled. If this is not done, the symptom will usually be a xxx-CLASS undefined function error. (2) Any other file which uses DEFMETHOD should eventually be recompiled. There is a "bridge" which causes old files to win for the time being, but this will eventually go away. Since new QFASL files wont work in old loads, its probably a good idea to rename your old QFASL files if you compile with the new load. When you do a DEFCLASS, you always get a fresh class with no methods defined. If you are redefining a class this means two things: instances of the old class will continue to work (this was not always true before. However, we still have the problem that method names can conflict between new and old versions of the class). all the methods used by a class need to be reloaded for new instances of the new class to win completely. Also subclasses of the given class need to be reloaded. Since reloading is a gross pain, you should not redo DEFCLASSes unless you really mean it. Probably DEFCLASSes should be put in a separate file so the rest of the file can be reprocessed without redoing the DEFCLASS. Hopefully, there will eventually exist system features to make this more convenient.

t apparently it's not in my bookmarks file one quibble: i don't think flavors was around until quite a bit later, maybe 01979, so the lispm software wasn't oo until quite late. weinreb and moon's aim-602 on it wasn't until 01980: https://apps.dtic.mil/sti/pdfs/ADA095523.pdf and of the five keywords they chose to describe it, one was 'smalltalk'