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POSynchronizing arbitrary properties in an object transparently in D
 

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    <p>Let's say I have a class like so:</p> <pre><code>class Gerbil{ int id; float x,y,z; } </code></pre> <p>Let's further say this is part of a real-time simulation where I have a server/client setup and I change a property on the server-side:</p> <pre><code>//... gerbil.x = 9.0; //... </code></pre> <p>Now I want to send over this change to the client to synchronize the world state. However, the problem is I have potentially vast amounts of gerbils, and these gerbils also potentially have long lists of properties—not just x,y,z as depicted here. </p> <p>My question is: <strong>Is there a way we can intercept these property assignments, transparently, and compile a diff from them?</strong></p> <p>From reading the D reference I got the impression <code>opAssign</code> might be the right thing, only there's actually no examples of how to use it? (<a href="http://www.digitalmars.com/d/2.0/operatoroverloading.html#Assignment" rel="nofollow">D Ref. / opAssign</a>) I suppose it would look something like this, but I'm just shooting from the hip:</p> <pre><code>void opAssign(string name)(float val){ //Just guessing here if(name in floatProps){ if(isServer){ changedProps.push(this.id, name, val); } floatProps[name] = val; } } </code></pre> <p>And then opAssign would be called when we do:</p> <pre><code>gerbil.x = 9.0; //Same as gerbil.opAssign!("x")(9.0) ?? </code></pre> <p>Apart from possibly wrong syntax, is this a step in the right direction? What is the right syntax? What about performance? It looks like it could be quite slow? Is there a faster, more "direct" way of this?</p> <p>What I'd really like to avoid here are elaborate setups like:</p> <pre><code>gerbil.incProp(Prop.X, 9.0); </code></pre> <p>Thanks for your time.</p>
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