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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"><blockquote>
<p>A literal doesn’t have a type on its own. Instead, a literal is parsed as having infinite precision and Swift’s type inference attempts to infer a type for the literal.</p>
<p><a href="https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html">Source</a></p>
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<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_1479750457810663936" 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 21. November 2016 um 18:46:32, Kenny Leung 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>This is so confusing. "Literals are untyped", but there’s a “BooleanLiteral”, which is obviously of type Boolean.<br><br>-Kenny<br><br><br>> On Nov 21, 2016, at 2:49 AM, Adrian Zubarev via swift-users <swift-users@swift.org> wrote:<br>> <br>> In general this is a correct behaviour, because literals in Swift are untyped. Int does not have any initializer for a Bool so the compiler tries to find a type that might conforms to ExpressibleByBooleanLiteral for all possible initializer of Int (Int.init(_: TYPE)). This resolution decides to go with NSNumber in your case?!<br>> <br>> The thing is, when you write Int(a > b), you’re passing a Bool and not a literal anymore. Here the compiler does not fallback to NSNumber anymore and reports you an error, because Int.init(_: Bool) does not exist. <br>> <br>> <br>> <br>> <br>> -- <br>> Adrian Zubarev<br>> Sent with Airmail<br>> <br>> Am 21. November 2016 um 04:48:35, Rick Mann via swift-users (swift-users@swift.org) schrieb:<br>> <br>>> It seems I can't do this:<br>>> <br>>> let r = Int(a > b)<br>>> <br>>> but I can do it with a literal:<br>>> <br>>> let r = Int(true)<br>>> <br>>> I'd like to do this to implement signum without branching, but perhaps that's not possible.<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>> <br>> _______________________________________________<br>> swift-users mailing list<br>> swift-users@swift.org<br>> https://lists.swift.org/mailman/listinfo/swift-users<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></div><div class="bloop_markdown"><p></p></div></body></html>