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    <p>If later on you start needing inheritance (i.e. LaserCannon is a subclass of Weapon) you will probably need to use metatables more profoundly.</p> <p>There are lots of libraries that will allow you to do "oop on top of Lua". You can see a very good list here:</p> <p><a href="http://lua-users.org/wiki/ObjectOrientedProgramming" rel="noreferrer">http://lua-users.org/wiki/ObjectOrientedProgramming</a></p> <p>I'm the author of <a href="https://github.com/kikito/middleclass" rel="noreferrer">middleclass</a>. With my lib, you would have to do something like this:</p> <pre><code>local Weapon = class('Weapon') function Weapon:initialize(a,b,c) self.x,self.y,self.z = a,b,c end function Weapon:fire(x,y) ... end </code></pre> <p>LaserCannon would be easy to implement - you just pass a second parameter to class:</p> <pre><code>local LaserCannon = class('LaserCannon', Weapon) function LaserCannon:initialize(a,b,c,d) self.w = d Weapon.initialize(self, a,b,c) -- superclass' constructor end function LaserCannon:foo() ... end </code></pre> <p>You could use it like this:</p> <pre><code>require 'middleclass' -- so you can use "class" LaserCannon = require 'laser_cannon' local playerWeapon = LaserCannon:new() -- a laser local opponentWeapon = Weapon:new() -- a regular generic weapon opponentWeapon:fire(100,200) -- typical use playerWeapon:fire(100, 200) -- LaserCannon inherits fire from Weapon playerWeapon:foo() -- LaserCannon-exclusive </code></pre> <p>This is with middleclass, which is the one I prefer, since I made it. Other libraries on the page I mentioned before offer similar features.</p>
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    1. COI've been looking at your library and do like it a lot. I may switch over to that soon. I have been doing some tests but ran into a huge issue. I'm using it for Corona SDK and ran into a situation when I need to set an onCollision function to be called. Typically I'd just do: self.canonBall.collision = onWeaponCollision self.canonBall:addEventListener ("collision", self.canonBall ) However, onWeaponCollision won't work. Is there a way to still do this with your library? Read more at: http://stackoverflow.com/questions/6363671/middleclass-problems
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    2. COanswered on that question :)
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