November 2000
- Walking Philip Loguinov, Draymoor
- MUD-Dev digest, Vol 1 #231 - 4 msgs Dr. Cat
- MUD-Dev digest, Vol 1 #231 - 4 msgs J C Lawrence
- MUD-Dev digest, Vol 1 #231 - 4 msgs Koster, Raph
- Atomic functions Felix A. Croes
- Atomic functions Ben
- Atomic functions Christopher Allen
- Atomic functions Ben
- Atomic functions Felix A. Croes
- Atomic functions KevinL
- Atomic functions Felix A. Croes
- Atomic functions KevinL
- Atomic functions KevinL
- Mud Dev FAQ part II Marian Griffith
- Walking Robert Zubek
- Opinions (even harsh) on Castle Marrach by Skotos? Christopher Allen
- Articles & Columns at Skotos Christopher Allen
- skotos David Zimet
- skotos Christopher Allen
- "An essay on d00dism and the MMORPG" Koster, Raph
- "An essay on d00dism and the MMORPG" Marian Griffith
- "An essay on d00dism and the MMORPG" birgit.schulte@philips.com
- "An essay on d00dism and the MMORPG" Norman Short
- "An essay on d00dism and the MMORPG" Jeff Freeman
- "An essay on d00dism and the MMORPG" gmiller@classic-games.com
- "An essay on d00dism and the MMORPG" Travis Casey
- "An essay on d00dism and the MMORPG" Lars Duening
- "An essay on d00dism and the MMORPG" Travis Casey
- "An essay on d00dism and the MMORPG" Lars Duening
- "An essay on d00dism and the MMORPG" Travis Casey
- "An essay on d00dism and the MMORPG" Lars Duening
- "An essay on d00dism and the MMORPG" Travis Casey
- "An essay on d00dism and the MMORPG" John Buehler
- "An essay on d00dism and the MMORPG" Vincent Archer
- "An essay on d00dism and the MMORPG" John Buehler
- "An essay on d00dism and the MMORPG" Paul Schwanz - Enterprise Services
- "An essay on d00dism and the MMORPG" John Buehler
- "An essay on d00dism and the MMORPG" Vincent Archer
- "An essay on d00dism and the MMORPG" Peter
- "An essay on d00dism and the MMORPG" John Buehler
- "An essay on d00dism and the MMORPG" Vincent Archer
- "An essay on d00dism and the MMORPG" Travis Casey
- "An essay on d00dism and the MMORPG" KevinL
- "An essay on d00dism and the MMORPG" John Buehler
- "An essay on d00dism and the MMORPG" KevinL
- "An essay on d00dism and the MMORPG" John Buehler
- "An essay on d00dism and the MMORPG" Xuri
- "An essay on d00dism and the MMORPG" John Buehler
- "An essay on d00dism and the MMORPG" KevinL
- "An essay on d00dism and the MMORPG" Rhys
- "An essay on d00dism and the MMORPG" Justin Rogers
- "An essay on d00dism and the MMORPG" Ted Milker
- "An essay on d00dism and the MMORPG" Steve {Bloo} Daniels
- "An essay on d00dism and the MMORPG" Zak Jarvis
- "An essay on d00dism and the MMORPG" Patrick Dughi
- "An essay on d00dism and the MMORPG" Travis Casey
- "An essay on d00dism and the MMORPG" Madrona Tree
- "An essay on d00dism and the MMORPG" Hans-Henrik Staerfeldt
- "An essay on d00dism and the MMORPG" Madrona Tree
- "An essay on d00dism and the MMORPG" Michael Tresca
- "An essay on d00dism and the MMORPG" Jeff Freeman
- "An essay on d00dism and the MMORPG" Jon Lambert
- "An essay on d00dism and the MMORPG" Travis Casey
- "An essay on d00dism and the MMORPG" |Eric|
- "An essay on d00dism and the MMORPG" Miroslav Silovic
- "An essay on d00dism and the MMORPG" John Buehler
- "An essay on d00dism and the MMORPG" Corey Crawford
- "An essay on d00dism and the MMORPG" ghovs@ghovs.moo.ca
- "An essay on d00dism and the MMORPG" Corey Crawford
- "An essay on d00dism and the MMORPG" Marian Griffith
- "An essay on d00dism and the MMORPG" Travis Casey
- "An essay on d00dism and the MMORPG" Richard Tew
- "An essay on d00dism and the MMORPG" Chris Gray
- "An essay on d00dism and the MMORPG" Steve {Bloo} Daniels
- "An essay on d00dism and the MMORPG" Richard Tew
- "An essay on d00dism and the MMORPG" msew
- "An essay on d00dism and the MMORPG" John Buehler
- "An essay on d00dism and the MMORPG" the_logos@www.achaea.com
- "An essay on d00dism and the MMORPG" geoffrey@yorku.ca
- "An essay on d00dism and the MMORPG" John Buehler
- "An essay on d00dism and the MMORPG" the_logos@www.achaea.com
- "An essay on d00dism and the MMORPG" Geoffrey@yorku.ca
- "An essay on d00dism and the MMORPG" Vincent Archer
- "An essay on d00dism and the MMORPG" Jason Belhumeur
- "An essay on d00dism and the MMORPG" Val Trullinger
- "An essay on d00dism and the MMORPG" Lee Sheldon
- "An essay on d00dism and the MMORPG" Travis Casey
- "An essay on d00dism and the MMORPG" Robert Zubek
- "An essay on d00dism and the MMORPG" Eric Rhea
- "An essay on d00dism and the MMORPG" Wells, Thomas
- "An essay on d00dism and the MMORPG" Travis Casey
- "An essay on d00dism and the MMORPG" Richard Tew
- "An essay on d00dism and the MMORPG" Koster, Raph
- "Virtual" What? Dave Rickey
- Object Models Ben
- Object Models J C Lawrence
- Object Models Dmitri Zagidulin
- Object Models KevinL
- Object Models Tony Wooster
- Object Models david.l.smith@home.com
- Object Models KevinL
- Object Models Gavin Doughtie
- Object Models John Robert Arras
- Object Models KevinL
- Object Models Bruce
- Object Models Ben Chambers
- Object Models Bruce
- Object Models KevinL
- Object Models Gavin Doughtie
- Object Models KevinL
- Object Models Travis Casey
- Object Models John Buehler
- Object Models Travis Casey
- Object Models John Buehler
- Object Models Chris Gray
- Object Models John Buehler
- Object Models Chris Gray
- Object Models olag@ifi.uio.no
- Object Models Miroslav Silovic
- Object Models Joe Andrieu
- Object Models John Buehler
- Object Models Miroslav Silovic
- Object Models Miroslav Silovic
- Object Models John Buehler
- Object Models Miroslav Silovic
- Object Models KevinL
- Object Models John Buehler
- Object Models Miroslav Silovic
- Object Models John Buehler
- Object Models Miroslav Silovic
- Object Models Bruce
- Object Models John Buehler
- Object Models Bruce
- Object Models John Buehler
- Object Models Phillip Lenhardt
- Object Models John Buehler
- Object Models olag@ifi.uio.no
- Object Models Travis Casey
- Object Models Miroslav Silovic
- Object Models John Buehler
- Object Models msew
- Object Models Russ Lewis
- Object Models John Buehler
- Object Models Phillip Lenhardt
- Object Models Travis Nixon
- Object Models John Buehler
- Object Models msew
- Object Models Andy
- Object Models Christopher Allen
- Object Models Chris Gray
- Object Models Travis Casey
- Object Models Marc Bowden
- Object Models Miroslav Silovic
- Object Models John Buehler
- Object Models Miroslav Silovic
- Object Models John Buehler
- Object Models Bruce
- Object Models John Buehler
- ADMIN: Lost posts J C Lawrence
- Multiple Inheritance (was: Object Models) Bruce
- Fanfic (Or: Why we can't all get along) Brian 'Psychochild' Green
- Fanfic (Or: Why we can't all get along) John Buehler
- Participatory Content (was Opinions (even harsh) on Castle Marrach by Skotos?) Christopher Allen
- Object Models (OO 101) Gavin Doughtie
- Consistent Characters (Was Remote client connection) John W Pierce
- Consistent Characters (Was Remote client connection) Marian Griffith
- (no subject) John Buehler
- (no subject) Mordengaard
- (no subject) John Buehler
- (no subject) Marian Griffith
- (no subject) John Buehler
- (no subject) John Buehler
- (no subject) KevinL
>>> "John Buehler" wrote
> I'm just jumping into this discussion. I'm not really picking on Kevin or
> Ben.
Fair enough ;)
> Try this: create components that implement well-defined behavior and
> stick 'em together to build up bigger components. One example presented was
This is exactly how I approach multiple inheritance - it's a question of how
you stick the components together, I guess.
> a room with a door and a room without a door. What about a room with two or
> more doors? Adding a door is a construction issue, not one of inheritance.
> Inheritance really isn't needed in most cases. And I'm talking about one
> contract (set of behaviors with a given virtual table of functions)
> inheriting its definition from another contract. That kind of inheritance
> is rarely needed, while inheritance of implementation is never needed.
> Create components from other components instead. That way, all contracts
> that exist in the software system are actually materialized instead of just
> being a vaguely understood relationship between a base C++ class
> implementation and the derived class.
I had this discussion with a friend the other day. The difference between
'is-a' and 'has-a' relationships. Here's my take on it, for what it's worth
(very little):
You're right in the case of doors in rooms, where more than one door in a room
is a reasonable occurence. However, if you look at the situations where
you've got only one instance of the behaviour occurring (for instance, adding
"lockable" to a chest), you'll find very little difference between those two
relationships.
I could make an object an open/close/lock/unlock object by either adding a
component that describes those behaviours, or by inheriting from an object
that describes those behaviours. In actual fact, the difference is negligible
- in both cases, I've added the behaviour, in both cases there's no chance of
adding it again, or adding a similar set of behaviours that might clash, or
whatever.
In fact, by componentising, you don't really solve the "collision" problem
anyway. The case I got into the discussion on in particular was materials -
the difference between inheriting the attributes for "steel", and adding a
component called "steel". In the second case, you can easily add "cloth" as
well (say, chain mail or something similar) - but the collision between the
attributes of the two components still has to be managed in some way, the same
as it would if you were inheriting.
The only difference I can really see is that, in inheriting, it's assumed
you're picking between one or the other, and the behaviour is encapsulated in
the object - whereas in componentising, you externalise the behaviour, and
build yourself a way to handle both sets at the same time. In that respect,
it makes sense to use components rather than inheritance. But then each
object does not carry it's own behaviour itself necessarily - and in some
environments that makes a difference (think, particularly, distributed objects
where the objects can migrate from server to server - the object itself needs
to know how to resolve conflicts anyway, so it's implementation might as well
be inherited as componentised).
I will actually pick on a couple of points above (sorry ;) - you mention C++,
I don't work in C++, and whether I did or not would be irrelevant, as the
mud-level object system is (should be?) disparate from the language system,
inasmuch as it needn't follow the same rules. I could, in fact, implement
some sort of "half-match" ability, so you can inherit from two objects that
implement functions to call precisely to deal with collisions (although I'd
count that a kludge fix).
I'd also say writing off inheritance of implementation as "never needed" is a
bit rash. Can you explain what you mean by that a bit more? At the moment,
I'm using multiple inheritance in a lot of cases specifically _because_ I want
to inherit implementation, I think (I'm not good with terminology, so precise
explanation here would be useful ;)
> I spent two years working at Microsoft Research with Tony Williams
> (inventor of COM) and Clemens Szyperski (author of "Component Software :
> Beyond Object-Oriented Programming" and who is also a 'name' in the
> component world) and had my eyes opened to what component software can do
> and why the C++ implementation-inheritance approach is giving engineers lots
> of rope to hang themselves with. Take some time to learn about component
> software and about strict contractual software development. I believe that
> it's the future of software. I'm very pleased that Dmitri brought up his
> 'atomic functions' topic because that goes hand in hand with where software
> must go in the future. We will need transacted methods if we want to have
> the high quality reusable software that is one of the holy grails of the
> software world. Funny how the database guys have known this all along...
I have books on COM and CORBA, I've implemented CORBA and XMLRPCish solutions
to thing - but I haven't the names or experience you hold. So I'll bow to a
higher understanding than mine, but I'll note that for what we're doing,
multiple inheritance and inheritance of the implementation of various small
aspects of things is really elegant so far - easy to understand, easy to work
with, extremely flexible. Agreed for certain things it doesn't fit, but then
for certain things components add a level of complexity that doesn't appear
warranted. Multiple inheritance in this environment just seems to "make
sense".
KL - (no subject) John Buehler
- (no subject) Joe Andrieu
- (no subject) Bruce
- (no subject) John Buehler
- (no subject) KevinL
- (no subject) John Buehler
- (no subject) KevinL
- (no subject) Dan Merillat
- (no subject) John Buehler
- (no subject) Brian 'Psychochild' Green
- (no subject) KevinL
- facist marketers / content controllers msew
- facist marketers / content controllers Dave Rickey
- And the lines blur between rl and games!!! msew
- "gossip" Josh Rollyson {dracus}
- Official announce of nevrax.org www site Vincent Archer
- Intersection of Fanfic & Participatory Content Christopher Allen
- A list of Content Creation Eric Rhea
- Refactoring (was Object Models) Gavin Doughtie
- PDA-esque devices used in gaming |Eric|
- Weather and Multiple Planets Greg Mitchell
- Weather and Multiple Planets rayzam
- Interesting EQ rant (very long quote) Brian 'Psychochild' Green
- Interesting EQ rant (very long quote) Vincent Archer
- Interesting EQ rant (very long quote) Lee Sheldon
- Interesting EQ rant (very long quote) Koster, Raph
- Interesting EQ rant (very long quote) rayzam
- Interesting EQ rant (very long quote) Travis Nixon
- Interesting EQ rant (very long quote) Matthew Mihaly
- Interesting EQ rant (very long quote) McQuaid, Brad
- Interesting EQ rant (very long quote) Travis Nixon
- Interesting EQ rant (very long quote) rayzam
- Interesting EQ rant (very long quote) Matthew Mihaly
- Interesting EQ rant (very long quote) Davian
- Interesting EQ rant (very long quote) Dave Rickey
- Interesting EQ rant (very long quote) Matthew Mihaly
- Interesting EQ rant (very long quote) Dave Rickey
- Interesting EQ rant (very long quote) Lee Sheldon
- Interesting EQ rant (very long quote) Lee Sheldon
- Interesting EQ rant (very long quote) McQuaid, Brad
- Interesting EQ rant (very long quote) Lee Sheldon
- Interesting EQ rant (very long quote) Madrona Tree
- Interesting EQ rant (very long quote) Lee Sheldon
- Interesting EQ rant (very long quote) msew
- Interesting EQ rant (very long quote) John Buehler
- Interesting EQ rant (very long quote) Phillip Lenhardt
- Interesting EQ rant (very long quote) John Buehler
- Interesting EQ rant (very long quote) Justin Hooper
- Interesting EQ rant (very long quote) John Buehler
- Interesting EQ rant (very long quote) Travis Nixon
- Interesting EQ rant (very long quote) John Buehler
- Interesting EQ rant (very long quote) Dave Rickey
- Interesting EQ rant (very long quote) John Buehler
- Interesting EQ rant (very long quote) J C Lawrence
- Interesting EQ rant (very long quote) John Buehler
- Interesting EQ rant (very long quote) Ananda Dawnsinger
- Interesting EQ rant (very long quote) John Buehler
- Interesting EQ rant (very long quote) Ananda Dawnsinger
- Interesting EQ rant (very long quote) John Buehler
- Interesting EQ rant (very long quote) the_logos@www.achaea.com
- Interesting EQ rant (very long quote) Marian Griffith
- Interesting EQ rant (very long quote) Tamzen Cannoy
- Interesting EQ rant (very long quote) Timothy Dang
- Interesting EQ rant (very long quote) John Buehler
- Interesting EQ rant (very long quote) the_logos@www.achaea.com
- Interesting EQ rant (very long quote) John Buehler
- Interesting EQ rant (very long quote) msew
- Interesting EQ rant (very long quote) Travis Nixon
- Interesting EQ rant (very long quote) Nathan F.Yospe
- Interesting EQ rant (very long quote) Phillip Lenhardt
- Interesting EQ rant (very long quote) Justin Hooper
- Interesting EQ rant (very long quote) John Buehler
- Interesting EQ rant (very long quote) the_logos@www.achaea.com
- Interesting EQ rant (very long quote) Travis Casey
- Interesting EQ rant (very long quote) Justin Hooper
- Interesting EQ rant (very long quote) Travis Casey
- Interesting EQ rant (very long quote) the_logos@www.achaea.com
- Interesting EQ rant (very long quote) John Buehler
- Interesting EQ rant (very long quote) the_logos@www.achaea.com
- Interesting EQ rant (very long quote) John Buehler
- Interesting EQ rant (very long quote) Madrona Tree
- Interesting EQ rant (very long quote) Jeff Freeman
- Interesting EQ rant (very long quote) rayzam
- Interesting EQ rant (very long quote) Jeff Freeman
- Interesting EQ rant (very long quote) the_logos@www.achaea.com
- Interesting EQ rant (very long quote) Koster, Raph
- Interesting EQ rant (very long quote) Jeff Freeman
- Interesting EQ rant (very long quote) Klyde Beattie
- Interesting EQ rant (very long quote) Travis Nixon
- Interesting EQ rant (very long quote) John Buehler
- Interesting EQ rant (very long quote) Hulbert, Leland
- Interesting EQ rant (very long quote) John Buehler
- Interesting EQ rant (very long quote) Vincent Archer
- Interesting EQ rant (very long quote) the_logos@www.achaea.com
- Interesting EQ rant (very long quote) Vincent Archer
- Interesting EQ rant (very long quote) the_logos@www.achaea.com
- Interesting EQ rant (very long quote) Jeff Freeman
- Interesting EQ rant (very long quote) the_logos@www.achaea.com
- Interesting EQ rant (very long quote) Madrona Tree
- Interesting EQ rant (very long quote) Daniel.Harman@barclayscapital.com
- Interesting EQ rant (very long quote) Madrona Tree
- Interesting EQ rant (very long quote) John Buehler
- Interesting EQ rant (very long quote) Justin Hooper
- Interesting EQ rant (very long quote) John Buehler
- Interesting EQ rant (very long quote) Willowreed@aol.com
- Interesting EQ rant (very long quote) Willowreed@aol.com
- Interesting EQ rant (very long quote) the_logos@www.achaea.com
- Interesting EQ rant (very long quote) J C Lawrence
- Interesting EQ rant (very long quote) the_logos@www.achaea.com
- Interesting EQ rant (very long quote) msew
- Interesting EQ rant (very long quote) Dave Rickey
- Interesting EQ rant (very long quote) J C Lawrence
- Interesting EQ rant (very long quote) J C Lawrence
- Interesting EQ rant (very long quote) Zak Jarvis
- Interesting EQ rant (very long quote) Hulbert, Leland
- Interesting EQ rant (very long quote) the_logos@www.achaea.com
- Interesting EQ rant (very long quote) Jeff Freeman
- Interesting EQ rant (very long quote) the_logos@www.achaea.com
- Interesting EQ rant (very long quote) Jeff Freeman
- Interesting EQ rant (very long quote) the_logos@www.achaea.com
- Interesting EQ rant (very long quote) J. Coleman
- Interesting EQ rant (very long quote) the_logos@www.achaea.com
- Interesting EQ rant (very long quote) Travis Nixon
- Interesting EQ rant (very long quote) msew
- Interesting EQ rant (very long quote) Chris Lloyd
- Interesting EQ rant (very long quote) msew
- Interesting EQ rant (very long quote) the_logos@www.achaea.com
- Interesting EQ rant (very long quote) Chris Lloyd
- Interesting EQ rant (very long quote) Travis Nixon
- Interesting EQ rant (very long quote) Marian Griffith
- Interesting EQ rant (very long quote) msew
- Interesting EQ rant (very long quote) Jon Lambert
- Interesting EQ rant (very long quote) Koster, Raph
- Interesting EQ rant (very long quote) the_logos@www.achaea.com
- Interesting EQ rant (very long quote) Chris Lloyd
- Interesting EQ rant (very long quote) John Buehler
- Interesting EQ rant (very long quote) the_logos@www.achaea.com
- Interesting EQ rant (very long quote) Daniel.Harman@barclayscapital.com
- Interesting EQ rant (very long quote) Dan Shiovitz
- Interesting EQ rant (very long quote) shren
- Interesting EQ rant (very long quote) Dave Rickey
- Interesting EQ rant (very long quote) the_logos@www.achaea.com
- Interesting EQ rant (very long quote) shren
- Interesting EQ rant (very long quote) the_logos@www.achaea.com
- Interesting EQ rant (very long quote) Travis Casey
- Interesting EQ rant (very long quote) the_logos@www.achaea.com
- Interesting EQ rant (very long quote) Travis Casey
- Interesting EQ rant (very long quote) Vincent Archer
- Interesting EQ rant (very long quote) twm139@its.to
- Interesting EQ rant (very long quote) Vincent Archer
- Interesting EQ rant (very long quote) Travis Nixon
- Interesting EQ rant (very long quote) Vincent Archer
- Interesting EQ rant (very long quote) Timothy Dang
- Interesting EQ rant (very long quote) Michael Tresca
- Interesting EQ rant (very long quote) Justin Hooper
- Interesting EQ rant (very long quote) Holly Sommer
- Interesting EQ rant (very long quote) Marian Griffith
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- Interesting EQ rant (very long quote) John Buehler
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- Interesting EQ rant (very long quote) Daniel.Harman@barclayscapital.com
- Interesting EQ rant (very long quote) Joe Andrieu
- Interesting EQ rant (very long quote) S. Patrick Gallaty
- Interesting EQ rant (very long quote) Daniel.Harman@barclayscapital.com
- Interesting EQ rant (very long quote) Brian 'Psychochild' Green
- Interesting EQ rant (very long quote) Zak Jarvis
- Interesting EQ rant (very long quote) John Vanderbeck
- Interesting EQ rant (very long quote) Matthew Mihaly
- Interesting EQ rant (very long quote) Vincent Archer
- Interesting EQ rant (very long quote) McQuaid, Brad
- Interesting EQ rant (very long quote) John Buehler
- Interesting EQ rant (very long quote) Brian 'Psychochild' Green
- Interesting EQ rant (very long quote) Vincent Archer
- Interesting EQ rant (very long quote) Richard Tew
- Interesting EQ rant (very long quote) Dave Rickey
- Interesting EQ rant (very long quote) J C Lawrence
- Interesting EQ rant (very long quote) John Buehler
- Interesting EQ rant (very long quote) Jon Lambert
- Dynamic Timelines Lord Ashon
- Dynamic Timelines |Eric|
- Dynamic Timelines Bruce
- Dynamic Timelines James Thomas
- Dynamic Timelines Travis Casey
- Neopets Matthew Mihaly
- Threads Ben Chambers
- Consistent Characters Jeremy Hovance
- Consistent Characters Travis Casey