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.error { color:#AA0000; }</style></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div class="bloop_markdown"><p>From the Swift book we know this:</p>
<blockquote>
<p>If you assign a value to a property within its own didSet observer, the new value that you assign <strong>replaces the one that was just set</strong>.</p>
</blockquote>
<p>That means that it won’t fire another <code>didSet</code> observer due replacing or in your case mutating. </p>
<p></p></div><div class="bloop_original_html"><style>body{font-family:Helvetica,Arial;font-size:13px}</style><div id="bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px; color: rgba(0,0,0,1.0); margin: 0px; line-height: auto;"><br></div> <br> <div id="bloop_sign_1475856994992038912" class="bloop_sign"><div style="font-family:helvetica,arial;font-size:13px">-- <br>Adrian Zubarev<br>Sent with Airmail</div></div> <br><p class="airmail_on">Am 7. Oktober 2016 um 17:46:37, Седых Александр via swift-users (<a href="mailto:swift-users@swift.org">swift-users@swift.org</a>) schrieb:</p> <blockquote type="cite" class="clean_bq"><span><div><div></div><div>Please look at that code:<br><br>class Mut {<br> <br> var zetstruct = MutStr(z: 5) {<br> didSet {<br> print("struct was change")<br> zetstruct.addZet(num: 10)<br> }<br> }<br> <br> struct MutStr {<br> var z: Int<br> mutating func addZet(num: Int) {<br> z += num<br> }<br> }<br> <br> func work() {<br> zetstruct.addZet(num: 10)<br> }<br>}<br><br>let mut = Mut()<br>mut.work()<br><br>Why in this case we don't have infinity cycle? Because when we change struct's property within mutating function it cause that instance property 'zetstruct' change and didSet invocate.<br><br>-- <br>Седых Александр<br>_______________________________________________<br>swift-users mailing list<br>swift-users@swift.org<br>https://lists.swift.org/mailman/listinfo/swift-users<br></div></div></span></blockquote></div><div class="bloop_markdown"><p></p></div></body></html>