Comments on: More Evil Inheritance http://pathfindersoftware.com/2007/10/more-evil-inher/ The Fastest Way to Launch Successful Software Thu, 19 Jan 2012 16:36:03 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Brian Dillard http://pathfindersoftware.com/2007/10/more-evil-inher/#comment-7141 Brian Dillard Tue, 02 Oct 2007 21:38:57 +0000 http://www.pathf.com/blogs/?p=237#comment-7141 <p>Douglas Crockford wrote a witty post about .extends a couple of years back. Check it out here:</p> <p><a href="http://blog.360.yahoo.com/blog-TBPekxc1dLNy5DOloPfzVvFIVOWMB0li?p=440" rel="nofollow">http://blog.360.yahoo.com/blog-TBPekxc1dLNy5DOloPfzVvFIVOWMB0li?p=440</a></p> Douglas Crockford wrote a witty post about .extends a couple of years back. Check it out here:

http://blog.360.yahoo.com/blog-TBPekxc1dLNy5DOloPfzVvFIVOWMB0li?p=440

]]> By: Thomas Hansen http://pathfindersoftware.com/2007/10/more-evil-inher/#comment-7140 Thomas Hansen Tue, 02 Oct 2007 00:03:06 +0000 http://www.pathf.com/blogs/?p=237#comment-7140 <p>As far as I am concerned I must congratulate you both on having re-invented LSP about 30 years after it first saw daylight...<br /> Nothing new here except that the author has completely overlooked MI...!<br /> Imagine this;<br /> class DarkPowers {}<br /> class Android {}<br /> class DardkAndroid : extends Android _&&_ DarkPowers {}</p> <p>Fact is for everybody that's done more than slightly advanced C++ MI solves most of the IS A/HAS A problems that Java and C# suffers from...<br /> So does also JavaScript...<br /> Look at this one for instance; <a href="http://smartwin.cvs.sourceforge.net/smartwin/SmartWin/include/smartwin/widgets/WidgetTextBox.h?revision=1.39&view=markup" rel="nofollow">http://smartwin.cvs.sourceforge.net/smartwin/SmartWin/include/smartwin/widgets/WidgetTextBox.h?revision=1.39&view=markup</a><br /> The above class is an extremley beautiful example of using IS A in a Multiple Inheritance environment without ever even being CLOSE to breaking Mrs. Liskow Substitution Principle what-so-ever...!<br /> I'm doing the exact same thing in JavaScript too in fact...!<br /> So unless you want to type out forward methods to a gazillion methods using "HAS A" you can easily utilize MI to inherit from a truckload off classes...<br /> Though from a single inheritance view I must confess I kind of agree...<br /> MI though goes completely ballistic with your entire thesis...</p> <p>.t</p> As far as I am concerned I must congratulate you both on having re-invented LSP about 30 years after it first saw daylight…
Nothing new here except that the author has completely overlooked MI…!
Imagine this;
class DarkPowers {}
class Android {}
class DardkAndroid : extends Android _&&_ DarkPowers {}

Fact is for everybody that’s done more than slightly advanced C++ MI solves most of the IS A/HAS A problems that Java and C# suffers from…
So does also JavaScript…
Look at this one for instance; http://smartwin.cvs.sourceforge.net/smartwin/SmartWin/include/smartwin/widgets/WidgetTextBox.h?revision=1.39&view=markup
The above class is an extremley beautiful example of using IS A in a Multiple Inheritance environment without ever even being CLOSE to breaking Mrs. Liskow Substitution Principle what-so-ever…!
I’m doing the exact same thing in JavaScript too in fact…!
So unless you want to type out forward methods to a gazillion methods using “HAS A” you can easily utilize MI to inherit from a truckload off classes…
Though from a single inheritance view I must confess I kind of agree…
MI though goes completely ballistic with your entire thesis…

.t

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