<div dir="ltr">Note that the compiler has a poor diagnostic for this case. I created <a href="https://bugs.swift.org/browse/SR-430">https://bugs.swift.org/browse/SR-430</a> a few weeks ago when I found this issue myself.</div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Jan 15, 2016 at 1:35 AM, Jo Albright via swift-users <span dir="ltr"><<a href="mailto:swift-users@swift.org" target="_blank">swift-users@swift.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">Hi Diego,<div><br></div><div>Since you have not given the x & y variables initial values, it requires them to be set inside the init. You can write it like below instead of calling the other self.init<br><div><br></div><div><span class=""><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"><span style="color:#bb2ca2">struct</span> Vector {</div><p style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo;min-height:13px"> <br></p><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"> <span style="color:#bb2ca2">var</span> x: <span style="color:#703daa">Double</span></div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"> <span style="color:#bb2ca2">var</span> y: <span style="color:#703daa">Double</span></div><p style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo;min-height:13px"> <br></p><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"> <span style="color:#bb2ca2">init</span>() {</div></span><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"> <span style="color:#4f8187">x</span> = <span style="color:#272ad8">0</span></div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"> <span style="color:#4f8187">y</span> = <span style="color:#272ad8">0</span></div><span class=""><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"> }</div><p style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo;min-height:13px"> <br></p><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"> <span style="color:#bb2ca2">init</span>(x: <span style="color:#703daa">Double</span>, y: <span style="color:#703daa">Double</span>) {</div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"> <span style="color:#bb2ca2">self</span>.<span style="color:#4f8187">x</span> = y</div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"> <span style="color:#bb2ca2">self</span>.<span style="color:#4f8187">y</span> = y</div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"> }</div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo"><br></div><div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo">}</div></span></div><div><br><div>
<div style="color:rgb(0,0,0);letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word"><br><span style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;float:none;display:inline!important"><font color="#8d8d8d">Designer . Developer . Nerd </font></span><font color="#464646"><br style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><span style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;float:none;display:inline!important">Jo Albright</span></font><br style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"></div>
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<br><div><blockquote type="cite"><div><div class="h5"><div>On Jan 14, 2016, at 11:48 PM, Diego Barros via swift-users <<a href="mailto:swift-users@swift.org" target="_blank">swift-users@swift.org</a>> wrote:</div><br></div></div><div><div><div class="h5"><div dir="ltr"><div class="gmail_default"><font face="monospace, monospace">Hi all,</font></div><div class="gmail_default"><font face="monospace, monospace"><br></font></div><div class="gmail_default"><font face="monospace, monospace">Given the following example:</font></div><div class="gmail_default"><font face="monospace, monospace"><br></font></div><div class="gmail_default"><div style="margin:0px;font-size:12px;line-height:normal"><font face="monospace, monospace">struct Vector {</font></div><div style="margin:0px;font-size:12px;line-height:normal"><font face="monospace, monospace"><span style="white-space:pre-wrap"> </span>var x: Double</font></div><div style="margin:0px;font-size:12px;line-height:normal"><font face="monospace, monospace"><span style="white-space:pre-wrap"> </span>var y: Double</font></div><p style="margin:0px;font-size:12px;line-height:normal;min-height:17px"><span style="white-space:pre-wrap"><font face="monospace, monospace"> </font></span><br></p><div style="margin:0px;font-size:12px;line-height:normal"><font face="monospace, monospace"><span style="white-space:pre-wrap"> </span>init() {</font></div><div style="margin:0px;font-size:12px;line-height:normal"><font face="monospace, monospace"><span style="white-space:pre-wrap"> </span><b>self.init(x: 0, y: 0)</b></font></div><div style="margin:0px;font-size:12px;line-height:normal"><font face="monospace, monospace"><span style="white-space:pre-wrap"> </span>}</font></div><p style="margin:0px;font-size:12px;line-height:normal;min-height:17px"><span style="white-space:pre-wrap"><font face="monospace, monospace"> </font></span><br></p><div style="margin:0px;font-size:12px;line-height:normal"><font face="monospace, monospace"><span style="white-space:pre-wrap"> </span>init(x: Double, y: Double) {</font></div><div style="margin:0px;font-size:12px;line-height:normal"><font face="monospace, monospace"><span style="white-space:pre-wrap"> </span>self.x = y</font></div><div style="margin:0px;font-size:12px;line-height:normal"><font face="monospace, monospace"><span style="white-space:pre-wrap"> </span>self.y = y</font></div><div style="margin:0px;font-size:12px;line-height:normal"><font face="monospace, monospace"><span style="white-space:pre-wrap"> </span>}</font></div><div style="margin:0px;font-size:12px;line-height:normal"><font face="monospace, monospace">}</font></div><div style="margin:0px;font-size:12px;line-height:normal"><font face="monospace, monospace"><br></font></div><div style="margin:0px;line-height:normal"><font face="monospace, monospace">I'm just curious as to why the <i>self</i> (in bold) is needed in the init() that's calling init(x: Double, y: Double)? Can't the compiler infer from the parameters what should be called?</font></div><div style="margin:0px;line-height:normal"><font face="monospace, monospace"><br></font></div><div style="margin:0px;line-height:normal"><font face="monospace, monospace">- Diego</font></div></div></div>
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