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    <p>Initializing a pointer (or array) <code>A * a</code> inside a method is a particular case of modifying your variable <code>a</code> (which is a pointer/array in this case). Modifying a variable inside a method can be done either by passing a pointer to it, or a reference to it. So in the case your variable is already a pointer, these two options are the following.</p> <p>By passing a pointer to your pointer <code>a</code>:</p> <pre><code>void init(A * *a) { *a = new A(); // or "new A[n]" if "a" is an array } void main() { A * a; init(&amp;a); } </code></pre> <p>Or passing a reference to your pointer:</p> <pre><code>void init(A * &amp;a) { a = new A(); // or "new A[n]" if "a" is an array } void main() { A * a; init(a); } </code></pre> <p>So in your case, <code>a</code> is an array of <code>unit*</code> (which I think is a bad design by the way, it would be better to simply use an array of <code>unit</code> and save you from this loop to dynamically allocate separately all units), so basically <code>a</code> is of type <code>unit **</code> so your <code>A</code> is actually the type <code>unit*</code>. Using the second method would lead to:</p> <pre><code>void init(unit* * &amp;units) </code></pre> <p>But as I said, it is probably better to simply use an array of <code>unit</code> instead, and your whole code would look like:</p> <pre><code>void initialize(unit * &amp;units /* etc */) { // note that I use unit instead of unit* here units = new unit[n]; for(register int i = 0; i&lt;n; i++) { // note that I remove the "new unit;" here // note that I use "." instead of "-&gt;" units[i].hunger = 5; units[i].locationX = (rand()%((grids-&gt;gridWidth)-0)); units[i].locationY = (rand()%((grids-&gt;gridHeight)-0)); //etc, etc } } void main() { unit * units; initialize(units); } </code></pre>
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