Self-interest November 2002

self-interest@lists.selflanguage.org

7 participants
3 discussions

embedding based prototype languages
by James McCartney 13 Nov '02

13 Nov '02

Is there a list for discussing prototype languages in general? I am interested in figuring out some details concerning languages like Omega, Kevo, Obliq that prefer embedding over delegation. The idea of embedding never really made sense to me until I read some slides by Luca Cardelli ("Object based vs Class based Languages", PLDI 96 Tutorial). Some things still seem problematic with the approach. I like a few things about it, easy to make dispatch fast, objects are self sufficient. For me, fast dispatch is important since I am currently using a Smalltalk-like language with constant time dispatch. It seems that change management would be a nightmare when you want to update a method that was inherited by a lot of objects. This might be solved by using "become:" ?? The slides contain this quote: "In embedding based languages such as Kevo and Omega, pervasive changes are achieved even without donor hierarchies." How? Also it seems more difficult to use inheritance in certain "part-of" situations (as was done NewtonScript for example), or doing so would cause a lot of unecessary space usage. This quote is also there: "Super and override make sense for implicit inheritance but not for explicit inheritance." But don't you still need to call the 'super' method in the (explicitly) overriding method sometimes? Another observation is that if you have doesNotUnderstand: then it is trivial to reimplement parent delegation in an embedding only language. So why not build it in to the dispatch routine anyway? I can't seem to find any info at all on the web on Kevo other than brief mentions. Omega seems very out of date. I'm unsure of the status of Obliq. -- --- james mccartney james(a)audiosynth.com <http://www.audiosynth.com> SuperCollider - a real time synthesis programming language for the PowerMac. <ftp://www.audiosynth.com/pub/updates/SC2.2.16.sea.hqx>

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binary trees
by aarthy_aiyer 11 Nov '02

11 Nov '02

hai guys, need good tutorial sites on binary trees,stacks,queues and sorting algorithms. pl i need help regards, aarthy aiyer.

2 1

[BUG] Self 4.1.6 fails to start on OS X 10.2.1
by Brian T Rice 02 Nov '02

02 Nov '02

First of all, I definitely appreciate the work on PICs for the PowerPC. On downloading and trying to work with the new version of Self, however, the SelfDroplet produces the following strange output and fails: water:localhost@~> cd "${SELF_WORKING_DIR}"/objects; ../vm/mac_osx/vm_project/build/Self.app/Contents/MacOS/Self -s "/Users/water/Self/objects/BareBones.snap" dyld: ../vm/mac_osx/vm_project/build/Self.app/Contents/MacOS/Self Undefined symbols: ../vm/mac_osx/vm_project/build/Self.app/Contents/MacOS/Self undefined reference to _tgetent expected to be defined in /usr/lib/libSystem.B.dylib ../vm/mac_osx/vm_project/build/Self.app/Contents/MacOS/Self undefined reference to _tgetflag expected to be defined in /usr/lib/libSystem.B.dylib ../vm/mac_osx/vm_project/build/Self.app/Contents/MacOS/Self undefined reference to _tgetnum expected to be defined in /usr/lib/libSystem.B.dylib ../vm/mac_osx/vm_project/build/Self.app/Contents/MacOS/Self undefined reference to _tgetstr expected to be defined in /usr/lib/libSystem.B.dylib ../vm/mac_osx/vm_project/build/Self.app/Contents/MacOS/Self undefined reference to _tgoto expected to be defined in /usr/lib/libSystem.B.dylib Trace/BPT trap water:localhost@Dev/Self/objects> ... Can someone reproduce this? The library definitely exists on my system. Perhaps it's supposed to be using a debugging or profiling library. Thanks, ~

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Self-interest November 2002