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dbCreateLib() vs ddCreateLib()

tweeks
Sometimes in SKILL, there are two names for the same function object:
eq(getd('type) getd('typep))  => t
Sometimes one is an alias for the other:
        cons(nil listAlias())->xCoord => car
And sometimes it's not at all clear why there are apparently two separate copies of the exact same function:

 

eq(getd('ddCreateLib) getd('dbCreateLib)) => nil
cons(nil listAlias())->ddCreateLib => nil
cons(nil listAlias())->dbCreateLib => nil
 
The interfaces are identical, and they even call the same triggers:
 
1> procedure(myPreCreateLibTrigger(@rest args) printf("myPreCreateLibTrigger%L\n" args))
myPreCreateLibTrigger
1> procedure(myPostCreateLibTrigger(@rest args) printf("myPostCreateLibTrigger%L\n" args))
myPostCreateLibTrigger
1> ddGetTriggerList("precreatelib")
nil
1> ddGetTriggerList("postcreatelib")
(("ddsCreateLibTrigger" t 100) 
    ("_tf_updateLibList" t 150)
)
1> ddRegTrigger("precreatelib" 'myPreCreateLibTrigger 200)
t
1> ddRegTrigger("postcreatelib" 'myPostCreateLibTrigger 200)
t
1> ddGetTriggerList("precreatelib")
(("myPreCreateLibTrigger" t 200))
1> ddGetTriggerList("postcreatelib")
(("ddsCreateLibTrigger" t 100) 
    ("_tf_updateLibList" t 150) 
    ("myPostCreateLibTrigger" t 200)
)
1> ddCreateLib("myDdLib")
myPreCreateLibTrigger("myDdLib" nil)
myPostCreateLibTrigger("myDdLib" "/work/tweeks/cds/myDdLib" dd:0x1612e230)
dd:0x1612e230
1> dbCreateLib("myDbLib")
myPreCreateLibTrigger("myDbLib" nil)
myPostCreateLibTrigger("myDbLib" "/work/tweeks/cds/myDbLib" dd:0x1830af80)
dd:0x1830af80
 
Can anyone please tell me if there is any difference at all between these two except that one apparently lives with the "db" code and the other with the "dd" code?
  • tweeks

    Ah, I have noticed one difference: 

    > arglist 'dbCreateLib
(g_general \@optional g_general "gg")
> arglist 'ddCreateLib
(t_string \@optional t_string t_string t_string "tttt")

    So ddCreateLib() takes more (undocumented) arguments than dbCreateLib()! When I tried passing the third argument, however, it hung my virtuoso... :(

  • Andrew Beckett

    The reason is historical. Both were created during the transition from "dm" to "dd" in the 4.3.4->4.4 timeframe (1995/6). You can use the publicly documented arguments of either - take your pick.

    Regards,

    Andrew.

  • tweeks

    It's a little scary sometimes how much you know about SKILL... :-o

    Thanks Andrew! 

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