<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>On 28 Mar 2013, at 17:50, Benito van der Zander wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: Monaco; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div><blockquote type="cite">What's the benefit?<br></blockquote>Same benefit as += to := ... +<br><br>You do not need to rewrite/compute the left side</div></span></blockquote><br></div><div>+= does *not* prevent re-evaluating the left side. It is internally translated to "x:=x+y" and then evaluated like normal. So if "x" contains a function call with side effects, these side effects are still triggered twice.</div><div><br></div><div><br></div><div>Jonas</div></body></html>