Why the callback is special ?<br><br>The compiler should has a warning for unused parameters of function.<br><br>I think this is enough. More works should be leaved for a lint tool.<br><br><br><div class="gmail_quote"><div dir="ltr">James Campbell via swift-evolution <<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a>>于2016年8月17日 周三06:39写道：<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;color:rgb(0,0,0)">I'm not sure about that last question, I guess someone who knows more about it than me could answer.</div></div><div class="gmail_extra"></div><div class="gmail_extra"><br clear="all"><div><div data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr">
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<br></div><div class="gmail_extra"><div class="gmail_quote">On 16 August 2016 at 23:37, James Campbell <span dir="ltr"><<a href="mailto:james@supmenow.com" target="_blank">james@supmenow.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;color:#000000">@noescape is a hint that the callback will only be called once and allows compiler to optimise, we may or may not be able to combine @required functionality into that but it looks like it was rejected for now.</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;color:#000000"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;color:#000000">@required is a compiler hint / sanity check to enforce that the callback is actually called once by the developer. There is no focus on any compiler enhancements other than that. </div></div>
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