<p>Is there a way to define an event that fires when the value of a variable changes?</p>
<hr/>**评论：**<br/><br/>tv64738: <pre><p><a href="https://golang.org/pkg/sync/#Cond" rel="nofollow">https://golang.org/pkg/sync/#Cond</a></p></pre>Sythe2o0: <pre><p>If you only allow the variable to be changed via functions that send such events, yes. Alternatively, you could spawn a goroutine that spun on the variable not changing, but that wouldn't be a good use of resources, and would have potential synchronization problems.</p></pre>madman2233: <pre><p>I think it would be cool if they implemented this for error. Instead of having a bunch of if err != nil blocks, just a quick one liner like watch err return. Kind of like defer</p></pre>chmikes: <pre><p>Yeah. Another idea would be to call them exception. </p></pre>
