<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div><br></div><div>On Feb 21, 2017, at 20:46, Xiaodi Wu via swift-evolution <<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a>> wrote:<br><br></div><blockquote type="cite"><div>Sign, perhaps, can be thought of as "part of a number," but signum refers to the signum function (<a href="http://en.wikipedia.org/wiki/Sign_function">http://en.wikipedia.org/wiki/Sign_function</a>) defined as:<br><br>-1 if x < 0<br>0 if x = 0<br>1 if x > 0<br><br>1 isn't really "part of" 42, for instance, at least not in the sense that 42 and + are "part of" 42.</div></blockquote><br><div>Should it be a stand-alone function, then?</div><div><br></div><div>- Dave Sweeris </div></body></html>