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POUsing C-style encapsulation techniques in Clojure?
 

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  1. POUsing C-style encapsulation techniques in Clojure?
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    <p>I am working on my first (non-trivial) <a href="http://code.google.com/p/stacked-crooked/source/browse/trunk/PlayGround/Clojure/Tetris.clj" rel="nofollow noreferrer">Clojure program</a> I don't really feel comfortable with how I am declaring all my mutable state globally. For example:</p> <pre><code>(def next-blocks (atom [])) (def num-next-blocks 1) (def is-game-over (atom false)) (def user-name (atom (str))) (def hs-xml (atom nil)) </code></pre> <p>Since I use C a lot at work I came up with the idea of using common C-style encapsulation techniques. It typically involves struct object that passed as a first argument to any "member functions" that operate on it. See <a href="http://www.kernel.org/pub/linux/utils/kernel/hotplug/libudev/libudev-udev-device.html" rel="nofollow noreferrer">udev</a> for example.</p> <p>Applying this to Clojure would result in functions that look like this (untested):</p> <pre><code>(defstruct gamestate) (defn game-new [] (struct-map gamestate :level (atom 0) :score (atom 0) ;etc... )) (def game-get-score [game] @(game :score)) (defn game-set-score [game new-score] (reset! (game :score) new-score)) (defn game-get-level [game] @(game :level)) (defn game-inc-level [game] (swap! (game :level) inc)) ; etc... </code></pre> <p>I think it would definitely be a step forward to the global defines that I'm using currently.</p> <p>So is this the recommended way to go? Or is there a more standard Clojure way?</p> <h3>Update</h3> <p>I'm currently using Clojure 1.1.0.</p>
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    1. COYou can always use a "let" block at the top of the global function to keep non-public functions local to the scope of what's being defined in your source file. It seems fairly perverted to try to impose a C way of doing things on a functional language like Clojure :-)
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    2. COWhich version of Clojure are you using? It changes which language facilities we can recommend.
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