<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">NSDecimal conforms to the ExpressibleBy(Float|Integer)Literal, but that just means it can be created from a literal value, not the other way around:</div><div class=""><br class=""></div><div class=""><a href="https://github.com/apple/swift-corelibs-foundation/blob/108a5b0006912c6cf6b59e4954255237bf01b67a/Foundation/NSDecimal.swift#L319-L329" class="">https://github.com/apple/swift-corelibs-foundation/blob/108a5b0006912c6cf6b59e4954255237bf01b67a/Foundation/NSDecimal.swift#L319-L329</a></div><div class=""><br class=""></div><div class=""><table class="js-file-line-container highlight tab-size" data-tab-size="8" style="box-sizing: border-box; border-spacing: 0px; border-collapse: collapse; tab-size: 8; color: rgb(51, 51, 51); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; font-size: 14.000000953674316px;"><tbody style="box-sizing: border-box;" class=""><tr style="box-sizing: border-box;" class=""></tr><tr style="box-sizing: border-box;" class=""><td id="LC317" class="js-file-line blob-code-inner blob-code" style="box-sizing: border-box; padding: 0px 10px; position: relative; line-height: 20px; vertical-align: top; overflow: visible; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 12px; word-wrap: normal; white-space: pre;"><br class=""></td></tr><tr style="box-sizing: border-box;" class=""><td id="L318" class="blob-num js-line-number" data-line-number="318" style="box-sizing: border-box; padding: 0px 10px; width: 50px; min-width: 50px; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 12px; line-height: 20px; color: rgba(0, 0, 0, 0.298039); text-align: right; white-space: nowrap; vertical-align: top; cursor: pointer; -webkit-user-select: none; border-style: solid; border-color: rgb(238, 238, 238); border-width: 0px 1px 0px 0px;"></td><td id="LC318" class="js-file-line blob-code-inner blob-code" style="box-sizing: border-box; padding: 0px 10px; position: relative; line-height: 20px; vertical-align: top; overflow: visible; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 12px; word-wrap: normal; white-space: pre;">
</td></tr><tr style="box-sizing: border-box;" class=""><td id="L319" class="blob-num js-line-number" data-line-number="319" style="box-sizing: border-box; padding: 0px 10px; width: 50px; min-width: 50px; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 12px; line-height: 20px; color: rgba(0, 0, 0, 0.298039); text-align: right; white-space: nowrap; vertical-align: top; cursor: pointer; -webkit-user-select: none; border-style: solid; border-color: rgb(238, 238, 238); border-width: 0px 1px 0px 0px;"></td><td id="LC319" class="js-file-line blob-code-inner blob-code" style="box-sizing: border-box; padding: 0px 10px; position: relative; line-height: 20px; vertical-align: top; overflow: visible; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 12px; word-wrap: normal; white-space: pre; background-color: rgb(248, 238, 199);"><span class="pl-k" style="box-sizing: border-box; color: rgb(167, 29, 93);">extension</span> <span class="pl-en" style="box-sizing: border-box; color: rgb(121, 93, 163);">Decimal</span> : <span class="pl-e" style="box-sizing: border-box; color: rgb(121, 93, 163);"><span class="pl-c1" style="box-sizing: border-box; color: rgb(0, 134, 179);">ExpressibleByFloatLiteral</span> </span>{</td></tr><tr style="box-sizing: border-box;" class=""><td id="L320" class="blob-num js-line-number" data-line-number="320" style="box-sizing: border-box; padding: 0px 10px; width: 50px; min-width: 50px; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 12px; line-height: 20px; color: rgba(0, 0, 0, 0.298039); text-align: right; white-space: nowrap; vertical-align: top; cursor: pointer; -webkit-user-select: none; border-style: solid; border-color: rgb(238, 238, 238); border-width: 0px 1px 0px 0px;"></td><td id="LC320" class="js-file-line blob-code-inner blob-code" style="box-sizing: border-box; padding: 0px 10px; position: relative; line-height: 20px; vertical-align: top; overflow: visible; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 12px; word-wrap: normal; white-space: pre; background-color: rgb(248, 238, 199);"> <span class="pl-k" style="box-sizing: border-box; color: rgb(167, 29, 93);">public</span> <span class="pl-k" style="box-sizing: border-box; color: rgb(167, 29, 93);">init</span>(<span class="pl-en" style="box-sizing: border-box; color: rgb(121, 93, 163);">floatLiteral</span> <span class="pl-smi" style="box-sizing: border-box;">value</span>: <span class="pl-c1" style="box-sizing: border-box; color: rgb(0, 134, 179);">Double</span>) {</td></tr><tr style="box-sizing: border-box;" class=""><td id="L321" class="blob-num js-line-number" data-line-number="321" style="box-sizing: border-box; padding: 0px 10px; width: 50px; min-width: 50px; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 12px; line-height: 20px; color: rgba(0, 0, 0, 0.298039); text-align: right; white-space: nowrap; vertical-align: top; cursor: pointer; -webkit-user-select: none; border-style: solid; border-color: rgb(238, 238, 238); border-width: 0px 1px 0px 0px;"></td><td id="LC321" class="js-file-line blob-code-inner blob-code" style="box-sizing: border-box; padding: 0px 10px; position: relative; line-height: 20px; vertical-align: top; overflow: visible; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 12px; word-wrap: normal; white-space: pre; background-color: rgb(248, 238, 199);"> <span class="pl-v" style="box-sizing: border-box; color: rgb(237, 106, 67);">self</span>.<span class="pl-k" style="box-sizing: border-box; color: rgb(167, 29, 93);">init</span>(value)</td></tr><tr style="box-sizing: border-box;" class=""><td id="L322" class="blob-num js-line-number" data-line-number="322" style="box-sizing: border-box; padding: 0px 10px; width: 50px; min-width: 50px; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 12px; line-height: 20px; color: rgba(0, 0, 0, 0.298039); text-align: right; white-space: nowrap; vertical-align: top; cursor: pointer; -webkit-user-select: none; border-style: solid; border-color: rgb(238, 238, 238); border-width: 0px 1px 0px 0px;"></td><td id="LC322" class="js-file-line blob-code-inner blob-code" style="box-sizing: border-box; padding: 0px 10px; position: relative; line-height: 20px; vertical-align: top; overflow: visible; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 12px; word-wrap: normal; white-space: pre; background-color: rgb(248, 238, 199);"> }</td></tr><tr style="box-sizing: border-box;" class=""><td id="L323" class="blob-num js-line-number" data-line-number="323" style="box-sizing: border-box; padding: 0px 10px; width: 50px; min-width: 50px; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 12px; line-height: 20px; color: rgba(0, 0, 0, 0.298039); text-align: right; white-space: nowrap; vertical-align: top; cursor: pointer; -webkit-user-select: none; border-style: solid; border-color: rgb(238, 238, 238); border-width: 0px 1px 0px 0px;"></td><td id="LC323" class="js-file-line blob-code-inner blob-code" style="box-sizing: border-box; padding: 0px 10px; position: relative; line-height: 20px; vertical-align: top; overflow: visible; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 12px; word-wrap: normal; white-space: pre; background-color: rgb(248, 238, 199);">}</td></tr><tr style="box-sizing: border-box;" class=""><td id="L324" class="blob-num js-line-number" data-line-number="324" style="box-sizing: border-box; padding: 0px 10px; width: 50px; min-width: 50px; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 12px; line-height: 20px; color: rgba(0, 0, 0, 0.298039); text-align: right; white-space: nowrap; vertical-align: top; cursor: pointer; -webkit-user-select: none; border-style: solid; border-color: rgb(238, 238, 238); border-width: 0px 1px 0px 0px;"></td><td id="LC324" class="js-file-line blob-code-inner blob-code" style="box-sizing: border-box; padding: 0px 10px; position: relative; line-height: 20px; vertical-align: top; overflow: visible; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 12px; word-wrap: normal; white-space: pre; background-color: rgb(248, 238, 199);">
</td></tr><tr style="box-sizing: border-box;" class=""><td id="L325" class="blob-num js-line-number" data-line-number="325" style="box-sizing: border-box; padding: 0px 10px; width: 50px; min-width: 50px; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 12px; line-height: 20px; color: rgba(0, 0, 0, 0.298039); text-align: right; white-space: nowrap; vertical-align: top; cursor: pointer; -webkit-user-select: none; border-style: solid; border-color: rgb(238, 238, 238); border-width: 0px 1px 0px 0px;"></td><td id="LC325" class="js-file-line blob-code-inner blob-code" style="box-sizing: border-box; padding: 0px 10px; position: relative; line-height: 20px; vertical-align: top; overflow: visible; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 12px; word-wrap: normal; white-space: pre; background-color: rgb(248, 238, 199);"><span class="pl-k" style="box-sizing: border-box; color: rgb(167, 29, 93);">extension</span> <span class="pl-en" style="box-sizing: border-box; color: rgb(121, 93, 163);">Decimal</span> : <span class="pl-e" style="box-sizing: border-box; color: rgb(121, 93, 163);"><span class="pl-c1" style="box-sizing: border-box; color: rgb(0, 134, 179);">ExpressibleByIntegerLiteral</span> </span>{</td></tr><tr style="box-sizing: border-box;" class=""><td id="L326" class="blob-num js-line-number" data-line-number="326" style="box-sizing: border-box; padding: 0px 10px; width: 50px; min-width: 50px; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 12px; line-height: 20px; color: rgba(0, 0, 0, 0.298039); text-align: right; white-space: nowrap; vertical-align: top; cursor: pointer; -webkit-user-select: none; border-style: solid; border-color: rgb(238, 238, 238); border-width: 0px 1px 0px 0px;"></td><td id="LC326" class="js-file-line blob-code-inner blob-code" style="box-sizing: border-box; padding: 0px 10px; position: relative; line-height: 20px; vertical-align: top; overflow: visible; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 12px; word-wrap: normal; white-space: pre; background-color: rgb(248, 238, 199);"> <span class="pl-k" style="box-sizing: border-box; color: rgb(167, 29, 93);">public</span> <span class="pl-k" style="box-sizing: border-box; color: rgb(167, 29, 93);">init</span>(<span class="pl-en" style="box-sizing: border-box; color: rgb(121, 93, 163);">integerLiteral</span> <span class="pl-smi" style="box-sizing: border-box;">value</span>: <span class="pl-c1" style="box-sizing: border-box; color: rgb(0, 134, 179);">Int</span>) {</td></tr><tr style="box-sizing: border-box;" class=""><td id="L327" class="blob-num js-line-number" data-line-number="327" style="box-sizing: border-box; padding: 0px 10px; width: 50px; min-width: 50px; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 12px; line-height: 20px; color: rgba(0, 0, 0, 0.298039); text-align: right; white-space: nowrap; vertical-align: top; cursor: pointer; -webkit-user-select: none; border-style: solid; border-color: rgb(238, 238, 238); border-width: 0px 1px 0px 0px;"></td><td id="LC327" class="js-file-line blob-code-inner blob-code" style="box-sizing: border-box; padding: 0px 10px; position: relative; line-height: 20px; vertical-align: top; overflow: visible; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 12px; word-wrap: normal; white-space: pre; background-color: rgb(248, 238, 199);"> <span class="pl-v" style="box-sizing: border-box; color: rgb(237, 106, 67);">self</span>.<span class="pl-k" style="box-sizing: border-box; color: rgb(167, 29, 93);">init</span>(value)</td></tr><tr style="box-sizing: border-box;" class=""><td id="L328" class="blob-num js-line-number" data-line-number="328" style="box-sizing: border-box; padding: 0px 10px; width: 50px; min-width: 50px; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 12px; line-height: 20px; color: rgba(0, 0, 0, 0.298039); text-align: right; white-space: nowrap; vertical-align: top; cursor: pointer; -webkit-user-select: none; border-style: solid; border-color: rgb(238, 238, 238); border-width: 0px 1px 0px 0px;"></td><td id="LC328" class="js-file-line blob-code-inner blob-code" style="box-sizing: border-box; padding: 0px 10px; position: relative; line-height: 20px; vertical-align: top; overflow: visible; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 12px; word-wrap: normal; white-space: pre; background-color: rgb(248, 238, 199);"> }</td></tr><tr style="box-sizing: border-box;" class=""><td id="L329" class="blob-num js-line-number" data-line-number="329" style="box-sizing: border-box; padding: 0px 10px; width: 50px; min-width: 50px; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 12px; line-height: 20px; color: rgba(0, 0, 0, 0.298039); text-align: right; white-space: nowrap; vertical-align: top; cursor: pointer; -webkit-user-select: none; border-style: solid; border-color: rgb(238, 238, 238); border-width: 0px 1px 0px 0px;"></td><td id="LC329" class="js-file-line blob-code-inner blob-code" style="box-sizing: border-box; padding: 0px 10px; position: relative; line-height: 20px; vertical-align: top; overflow: visible; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 12px; word-wrap: normal; white-space: pre; background-color: rgb(248, 238, 199);">}</td></tr><tr style="box-sizing: border-box;" class=""><td id="L330" class="blob-num js-line-number" data-line-number="330" style="box-sizing: border-box; padding: 0px 10px; width: 50px; min-width: 50px; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 12px; line-height: 20px; color: rgba(0, 0, 0, 0.298039); text-align: right; white-space: nowrap; vertical-align: top; cursor: pointer; -webkit-user-select: none; border-style: solid; border-color: rgb(238, 238, 238); border-width: 0px 1px 0px 0px;"></td></tr></tbody></table><br class=""></div><div class="">It would be relatively simple for the NSDecimal to add an extension initialiser to Double to allow construction directly from an NSDecimal, but it would have to be done for both the Linux and Darwin implementations.</div><div class=""><br class=""></div><div class="">Alex</div><br class=""><div><blockquote type="cite" class=""><div class="">On 28 Nov 2016, at 17:15, David Sweeris <<a href="mailto:davesweeris@mac.com" class="">davesweeris@mac.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="content-type" content="text/html; charset=utf-8" class=""><div dir="auto" class=""><div class=""><br class=""></div><div class="">On Nov 28, 2016, at 09:48, Philippe Hausler via swift-users <<a href="mailto:swift-users@swift.org" class="">swift-users@swift.org</a>> wrote:<br class=""><br class=""></div><blockquote type="cite" class=""><div class=""><meta http-equiv="Content-Type" content="text/html charset=utf-8" class=""><div class="">This might be a bit nicer since that is relying on NSNumber bridges. You can bridge to NSDecimalNumber directly like this: </div><div class=""><br class=""></div><div class=""><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(112, 61, 170);" class=""><span style="font-variant-ligatures: no-common-ligatures;" class="">(</span><span style="font-variant-ligatures: no-common-ligatures" class="">Decimal</span><span style="font-variant-ligatures: no-common-ligatures;" class="">(</span><span style="font-variant-ligatures: no-common-ligatures; color: #272ad8" class="">1.0</span><span style="font-variant-ligatures: no-common-ligatures;" class="">) </span><span style="font-variant-ligatures: no-common-ligatures; color: #ba2da2" class="">as</span><span style="font-variant-ligatures: no-common-ligatures;" class=""> </span><span style="font-variant-ligatures: no-common-ligatures" class="">NSDecimalNumber</span><span style="font-variant-ligatures: no-common-ligatures;" class="">).</span><span style="font-variant-ligatures: no-common-ligatures" class="">doubleValue</span></div></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(112, 61, 170);" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""><br class=""></span></div><div style="margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures;" class="">(but perhaps we should consider adding initializers that follow the same pattern as Double that don’t have to bridge to solve the problem)</span></div><br class=""><div class=""><blockquote type="cite" class=""><div class="">On Nov 28, 2016, at 2:40 AM, Alex Blewitt via swift-users <<a href="mailto:swift-users@swift.org" class="">swift-users@swift.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html charset=us-ascii" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">You can wrap it with an NSDecimalNumber, and then cast it to a Double from there:<div class=""><br class=""></div><div class=""><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">Double(NSDecimalNumber(decimal:Decimal(1.0)))</span></div><div class=""><br class=""></div><div class=""><span style="font-variant-ligatures: no-common-ligatures" class="">Alex</span></div><div class=""><span style="font-variant-ligatures: no-common-ligatures" class=""><br class=""></span></div><div class=""><blockquote type="cite" class=""><div class="">On 28 Nov 2016, at 10:13, Rick Mann via swift-users <<a href="mailto:swift-users@swift.org" class="">swift-users@swift.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">How do I get a Double from a Decimal?<br class=""><br class="">TIA,<br class=""><br class="">-- <br class="">Rick Mann<br class=""><a href="mailto:rmann@latencyzero.com" class="">rmann@latencyzero.com</a><br class=""><br class=""><br class="">_______________________________________________<br class="">swift-users mailing list<br class=""><a href="mailto:swift-users@swift.org" class="">swift-users@swift.org</a><br class=""><a href="https://lists.swift.org/mailman/listinfo/swift-users" class="">https://lists.swift.org/mailman/listinfo/swift-users</a><br class=""></div></div></blockquote></div><br class=""></div></div>_______________________________________________<br class="">swift-users mailing list<br class=""><a href="mailto:swift-users@swift.org" class="">swift-users@swift.org</a><br class=""><a href="https://lists.swift.org/mailman/listinfo/swift-users" class="">https://lists.swift.org/mailman/listinfo/swift-users</a><br class=""></div></blockquote></div><br class=""></div></blockquote><blockquote type="cite" class=""><div class=""><span class="">_______________________________________________</span><br class=""><span class="">swift-users mailing list</span><br class=""><span class=""><a href="mailto:swift-users@swift.org" class="">swift-users@swift.org</a></span><br class=""><span class=""><a href="https://lists.swift.org/mailman/listinfo/swift-users" class="">https://lists.swift.org/mailman/listinfo/swift-users</a></span><br class=""></div></blockquote><div class=""><br class=""></div><div class="">Does NSDecimalNumber conform to the floating point literal whosywhatsit protocol? If not, wouldn't both of those examples just covert a Double to a decimal and back again? Would there be a purpose to that? Like maybe it'd get rounded differently or something?</div><div class=""><br class=""></div><div class="">Once you have an NSDecimalNumber variable, though, I don't know of any better way than that '.doubleValue' property you and Alex mentioned.</div><div class=""><br class=""></div><div class="">- Dave Sweeris</div></div></div></blockquote></div><br class=""></body></html>