<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=""><br class=""><div><blockquote type="cite" class=""><div class="">On Apr 14, 2016, at 11:01 PM, Chris Lattner via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">On Apr 14, 2016, at 9:49 PM, Stephen Canon <<a href="mailto:scanon@apple.com" class="">scanon@apple.com</a>> wrote:<br class=""><div class=""><blockquote type="cite" class=""><div class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><blockquote type="cite" class=""><div class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">On Apr 14, 2016, at 4:55 PM, Stephen Canon via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:</div><div class=""><blockquote type="cite" class=""><div class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><ul style="box-sizing: border-box; padding-left: 2em; margin-top: 0px; margin-bottom: 16px; color: rgb(51, 51, 51); font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; font-size: 16px; background-color: rgb(255, 255, 255);" class=""><li style="box-sizing: border-box;" class="">Provide basic constants (analogues of C's DBL_MAX, etc.)</li></ul></div></div></blockquote><div class="">Nice, have you considered adding pi/e and other common constants? I’d really really like to see use of M_PI go away… :-)</div></div></div></div></blockquote><div class=""><br class=""></div><div class="">That’s a reasonable suggestion. I’m not sure if FloatingPoint is the right protocol to attach them to, but I’m not sure that it’s wrong either. I’d be interested to hear arguments from the community either way.</div></div></div></div></blockquote><div class=""><br class=""></div>I’m not sure where the right place is either, I just want them :-) Seriously though, the notion of pi seems to make sense for both decimal and binary fp types, it seems base independent.</div></div></div></blockquote><br class=""></div><div>Incidentally, if you make pi and e be static members of the type, we should get a pretty fluent style, along the lines of:</div><div><br class=""></div><div><span class="Apple-tab-span" style="white-space: pre;"> </span>let x = someDouble * 2 * .pi</div><div><br class=""></div><div>I agree that there is a concern about deciding “which” constants to include. I’ll let you and the numeric elite figure that out :-)</div><div><br class=""></div><div>-Chris</div><br class=""></body></html>