<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="" dir="auto"><div class="">Right. @available doesn't do anything at run time; it just lets the compiler enforce availability restrictions. Additionally, it's attached to a particular declaration, so it fits in the existing attribute model.</div><div class=""><br class=""></div><div class="">#available, on the other hand, can turn into a dynamic check, and it can happen anywhere in code. It's not <i class="">just</i> a dynamic check, though; it also participates in the compiler's availability model. So we needed a new kind of thing that could handle this use case.</div><div class=""><br class=""></div><div class="">Hope that helps clear things up.</div><div class="">Jordan</div><div class=""><br class=""></div><br class=""><div><blockquote type="cite" class=""><div class="">On Feb 4, 2016, at 8:02 , Jean-Daniel Dupas 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=""><div class=""># as seen a convention for compiler generated code. #line expands to a String, #available expands to a runtime check that represent a bool.</div><div class=""><br class=""></div><div class="">I don’t see what’s wrong with that.</div><div class=""><br class=""></div><div class=""><blockquote type="cite" class=""><div class="">Le 4 févr. 2016 à 16:53, James Campbell via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> a écrit :</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">Just in general. I've been told that # is being seen as a convention for the compiler to treat it like a macro but we have @avaliable and you're saying #avaliable isn't even a compiler check.</div><div class="gmail_extra"><br clear="all" class=""><div class=""><div class="gmail_signature"><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><p class=""><b class=""><font color="#cc0000" class="">___________________________________</font></b></p><p class=""><b class="">James⎥Lead Engineer</b></p><p class=""><b class=""><font color="#cc0000" class=""><a href="mailto:james@supmenow.com" target="_blank" class="">james@supmenow.com</a>⎥<a href="http://supmenow.com/" target="_blank" class="">supmenow.com</a></font></b></p><p class=""><b class=""><font size="2" class="">Sup</font></b></p><p class=""><b class=""><font size="2" class="">Runway East
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<br class=""><div class="gmail_quote">On Thu, Feb 4, 2016 at 3:48 PM, Jean-Daniel Dupas <span dir="ltr" class=""><<a href="mailto:mailing@xenonium.com" target="_blank" class="">mailing@xenonium.com</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word" class="">It depends it you talk about the @vailable attribute used to annotate methods, or the #available runtime check used to choose a code path depending the OS version.<div class=""><br class=""><div class=""><blockquote type="cite" class=""><div class=""><div class="h5"><div class="">Le 4 févr. 2016 à 16:05, James Campbell via swift-evolution <<a href="mailto:swift-evolution@swift.org" target="_blank" class="">swift-evolution@swift.org</a>> a écrit :</div><br class=""></div></div><div class=""><div class=""><div class="h5"><div dir="ltr" class="">How come avaliable sometimes has a @ and a #<br clear="all" class=""><div class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><p class=""><b class=""><font color="#cc0000" class="">___________________________________</font></b></p><p class=""><b class="">James⎥Lead Engineer</b></p><p class=""><b class=""><font color="#cc0000" class=""><a href="mailto:james@supmenow.com" target="_blank" class="">james@supmenow.com</a>⎥<a href="http://supmenow.com/" target="_blank" class="">supmenow.com</a></font></b></p><p class=""><b class=""><font size="2" class="">Sup</font></b></p><p class=""><b class=""><font size="2" class="">Runway East
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