I don't understand why these pointers don't work as I'm expecting

xuanbao · · 398 次点击    
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<p>I am the most confused.</p> <p>I pass a pointer of an int to a function. I dereference it into another variable, increment variable and assign the address of that variable to the original pointer.</p> <p>But the change is lost.</p> <p><a href="https://play.golang.org/p/b5cAMv1hIG" rel="nofollow">https://play.golang.org/p/b5cAMv1hIG</a></p> <p>I have the dumb today and I don&#39;t see where this is failing</p> <p>*EDIT: I didn&#39;t understand pointers, I get it now. Thanks to <a href="/u/chrj" rel="nofollow">/u/chrj</a> </p> <hr/>**评论:**<br/><br/>janderssen: <pre><p>Also, you could simply do the following :</p> <pre><code>func alter(a *int) { *a++ } </code></pre> <p>Basically deferences the pointer to its value and increments it.</p></pre>chrj: <pre><p>Change the last line to:</p> <pre><code>*a = b </code></pre> <p>You want to change what <code>a</code> is pointing to.</p></pre>Smokey_Circles: <pre><p>Oh...</p> <p>I don&#39;t know why I thought I could change the address of the pointer. Evidently I hadn&#39;t internalised what was going on under the scenes of things like <code>json.Unmarshal</code> and it felt like I was re-assigning the address.</p> <p>Thanks though, this clears up a lot of uncertainties I had :) </p></pre>

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