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POHow to design around lack of multiple inheritance?
 

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  1. POHow to design around lack of multiple inheritance?
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    <p>Using interfaces won't work because I want a single implementation. Using <a href="https://stackoverflow.com/questions/3849097/how-to-simulate-multiple-inheritance-without-interfaces">this</a> solution would end in a lot of redundant code because I plan on having quite a few sub classes (composition vs inheritance). I've decided that a problem-specific design solution is what I'm looking for, and I can't think of anything elegant.</p> <p>Basically I want classes to have separate properties, and for those properties to be attached at design time to any sub class I choose. Say, I have class 'ninja'. I would like to be able to make arbitrary sub classes such as 'grayNinja' where a gray ninja will always have a sword and throwing stars. Then possibly 'redNinja' who will always have a sword and a cape. Obviously swords, stars, and capes will each have their own implementation - and this is where I can't use interfaces. The closest solution I could find was the <a href="http://en.wikipedia.org/wiki/Decorator_pattern" rel="nofollow noreferrer">decorator pattern</a>, but I don't want that functionality at runtime. Is the best solution an offshoot of that? Where inside the Black Ninja class constructor, I pass it through the constructors of sword and throwingStar? (those being abstract classes)</p> <p>haven't coded in a while and reading hasn't gotten me too far - forgive me if the answer is simple.</p> <p><strong>Edit:</strong> Answered my own question. I can't mark it as 'answer' until tomorrow. Please let me know if there's a problem with it that I didn't catch. All the reading this problem forced me to do has been awesome. Learned quite a bit.</p>
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    1. COIt's not clear to me why you don't like composition.
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    2. CO(+1) Because some O.O. languages support single inheritance, and no interfaces at all.
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    3. CO@Beta - Composition requires you to retype the method every single time. I plan on not only having a lot of properties, but a lot of sub classes. The redundant code seems extremely messy and unnecessary.
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