<html><head></head><body>From some older evolution-thread:<div><span style="background-color: rgba(255, 255, 255, 0);"><span style="border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px; word-wrap: normal; line-height: normal !important;"><br></span></span></div><div><span style="background-color: rgba(255, 255, 255, 0);"><span style="border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px; word-wrap: normal; line-height: normal !important;">extension SignedNumberType { </span> </span></div><div><span style="background-color: rgba(255, 255, 255, 0);"> var sign: Self { </span></div><div><span style="background-color: rgba(255, 255, 255, 0);"> if self == (0 as Self) { </span></div><div><span style="background-color: rgba(255, 255, 255, 0);"> return (0 as Self) </span></div><div><span style="background-color: rgba(255, 255, 255, 0);"> } else if self > (0 as Self) { </span></div><div><span style="background-color: rgba(255, 255, 255, 0);"> return (1 as Self) </span></div><div><span style="background-color: rgba(255, 255, 255, 0);"> } </span></div><div><span style="background-color: rgba(255, 255, 255, 0);"> return (-1 as Self) </span></div><div><span style="background-color: rgba(255, 255, 255, 0);"> } </span></div><div><span style="background-color: rgba(255, 255, 255, 0);">}</span><div><div><div class="bloop_sign"><div style="font-family:helvetica,arial;font-size:13px">-- <br>Adrian Zubarev<br>Sent with Airmail</div></div> <p class="gmail_quote" style="color:#000;">Am 20. November 2016 um 03:44:04, Rick Mann via swift-users (<a href="mailto:swift-users@swift.org">swift-users@swift.org</a>) schrieb:</p> <blockquote type="cite" class="gmail_quote"><span><div><div></div><div>I'm trying to do this:<br><br>protocol Signumable<br>{<br> func sgn() -> Self<br>}<br><br>extension Signumable<br>{<br> func<br> sgn()<br> -> Self<br> {<br> let pos = 0 < self // Error<br> let neg = self < 0 // Error<br> let p = pos ? Self(1) : Self(0)<br> let n = neg ? Self(1) : Self(0)<br> return p - n<br> }<br>}<br><br><br>extension Double : Signumable {}<br><br>But I get<br><br>Binary operator '<' cannot be applied to operands of type 'Int' and 'Self'<br><br>I figure there should be additional constraints on Signumable.<br><br>Help would be much appreciated!<br><br><br>-- <br>Rick Mann<br>rmann@latencyzero.com<br><br><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>
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