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New Re: Polymorphism relies on a lie
But that assumes that the world devides nicely up into a single "subtype" taxonomy.
No, it doesn't. Stop confusing inheritance with polymorphism.You've been told this time and time again.

Further, in Smalltalk and the like such dispatching is still made at run-time.
And this is different from your "eval" how, exactly? Smalltalk optimizes its runtime dispatch to an extreme level that is possible only because of the meta-information provided by the classes. This is impossible with simple evals.
Regards,

-scott anderson

"Welcome to Rivendell, Mr. Anderson..."
New Mostly, it is
Stop confusing inheritance with polymorphism.

In MOST cases, or at least in the comparisons being made here, polymorphism assumes a tree or tree-like taxonomy, or at least a single-dimensional list of mutually-exclusive choices. The "taxonomy" may not be explicitly given to the language, but it is there.

And this is different from your "eval" how

I thought we were comparing mostly case statements here.
________________
oop.ismad.com
New To the naive programmer, perhaps.
Of C++, Smalltalk, Python, Perl, and Java, just C++ uses implementation inheritance only. C++ has multiple inheritance, however, which can mitigate the issue by using mix-ins or strictly virtual classes inherited to simulate interfaces.
Regards,

-scott anderson

"Welcome to Rivendell, Mr. Anderson..."
     Lines of code in a Java method ... - (bluke) - (73)
         I don't know of studies of this with OO languages - (ben_tilly) - (64)
             I remember that when I read Code Complete ... - (bluke) - (60)
                 Hence my speculation about how and why to change that for OO -NT - (ben_tilly) - (59)
                     In OO code many of the decision points ... - (bluke) - (58)
                         Quibble - (ben_tilly) - (57)
                             Okay, thought it was just me - (drewk) - (46)
                                 Not really missing anything. - (FuManChu) - (1)
                                     VMT in C++ - (Arkadiy)
                                 The superclass decides nothing - (ben_tilly) - (43)
                                     Once again, it's the terminology - (drewk) - (40)
                                         That's not multiple inheritance - (ben_tilly)
                                         Ramble ramble ramble - (FuManChu)
                                         Yes and No - (bluke) - (37)
                                             I mis-read Ben - (drewk) - (36)
                                                 You misunderstand interfaces and factories ... - (bluke) - (2)
                                                     Drew is right. - (FuManChu) - (1)
                                                         My point was - (bluke)
                                                 I'm actually on the fence - (ben_tilly) - (32)
                                                     That is with implementation inheritance - (bluke) - (2)
                                                         That is both with interface and implementation inheritance - (ben_tilly) - (1)
                                                             With interfaces it is less of a concern - (bluke)
                                                     Hadn't heard of LSP - (drewk) - (28)
                                                         Huh? - (tuberculosis) - (27)
                                                             Don't get all religious on me - (drewk) - (26)
                                                                 Going to disagreed on this point - (JimWeirich) - (1)
                                                                     agreed - (deSitter)
                                                                 Re: Don't get all religious on me - (JimWeirich) - (23)
                                                                     And that's the key point - (ben_tilly) - (22)
                                                                         Someday I've got to take a class - (drewk) - (21)
                                                                             ..when I get my inheritance -NT - (deSitter)
                                                                             Yup. No generic substitute for that. -NT - (FuManChu)
                                                                             Good idea in this instance. - (admin) - (14)
                                                                                 I object; it's part of a general pattern -NT - (FuManChu) - (13)
                                                                                     Ah, but I have a cunning strategy... - (admin) - (12)
                                                                                         Bah. Overridden. - (FuManChu) - (1)
                                                                                             Overloaded your capacity for understanding, eh? - (admin)
                                                                                         Ashton, is that you? - (Another Scott) - (7)
                                                                                             Better than the treasurer... - (admin) - (6)
                                                                                                 He'll have to wait - I'm collecting garbage - (ben_tilly) - (5)
                                                                                                     Coincidentally, there's a fellow around here named Mark... - (admin) - (4)
                                                                                                         I'm sorry but that pointer is dangling - (ben_tilly) - (3)
                                                                                                             Some people have too much time on their hands... - (static) - (2)
                                                                                                                 You're a real LALRf riot. - (admin) - (1)
                                                                                                                     So you sed. Personally, I think it's a Perl in the Blinker. -NT - (Another Scott)
                                                                                         Uuuuuhh... - (jb4)
                                                                                         The cun.. er, clever linguist suffers Code 715 - (Ashton)
                                                                             Or an interface - (tuberculosis) - (2)
                                                                                 Yes, and that's what we do - (drewk) - (1)
                                                                                     Language doesn't need to support abstract class - (tuberculosis)
                                                                             That was not what I meant - (bluke)
                                     It's a decision, but it's abstracted out - (Arkadiy) - (1)
                                         Yes, but I don't care how it works - (bluke)
                             DP's are compressed in OO - (tuberculosis) - (6)
                                 Polymorphism relies on a lie - (tablizer) - (5)
                                     Re: Polymorphism relies on a lie - (admin) - (2)
                                         Mostly, it is - (tablizer) - (1)
                                             To the naive programmer, perhaps. - (admin)
                                     Something tells me you'd like prototype OO as a midground -NT - (FuManChu) - (1)
                                         *No-one* can eat that much crow -NT - (pwhysall)
                             We had a big fight over case-vs-poly a few years ago -NT - (tablizer) - (2)
                                 Charley Rock Tree - (ChrisR) - (1)
                                     Ha! :-) -NT - (Another Scott)
             Re: I don't know of studies of this with OO languages - (deSitter)
             Interesting comment by Ron Jeffries - (bluke) - (1)
                 Re: Interesting comment by Ron Jeffries - (deSitter)
         to minimize the damage that these kind of developers wreak - (Arkadiy) - (1)
             Unfortunately I can't - (bluke)
         4. -NT - (FuManChu) - (2)
             In smalltalk that might be realistic - (bluke) - (1)
                 That was my point. Glad someone got the joke :) -NT - (FuManChu)
         1/2 page - (tuberculosis)
         Re: Lines of code in a Java method ... - (dshellman) - (1)
             Agree - (bluke)

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