220 23939 article Path: news.gmane.org!not-for-mail From: gufideg@gmail.com Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Question about N4447 Date: Fri, 22 Jan 2016 10:52:20 -0800 (PST) Lines: 40 Approved: news@gmane.org Message-ID: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_975_379361640.1453488740671" X-Trace: ger.gmane.org 1453488746 16912 80.91.229.3 (22 Jan 2016 18:52:26 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 22 Jan 2016 18:52:26 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBC23RWMN2YNRBZPURG2QKGQELUX3C5A@isocpp.org Fri Jan 22 19:52:26 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-qk0-f197.google.com ([209.85.220.197]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1aMgor-0003BY-Fi for gclcip-std-proposals@m.gmane.org; Fri, 22 Jan 2016 19:52:25 +0100 Original-Received: by mail-qk0-f197.google.com with SMTP id u128sf128488584qkh.0 for ; Fri, 22 Jan 2016 10:52:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:message-id:subject:mime-version:content-type :x-original-sender:reply-to:precedence:mailing-list:list-id :x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=d1Q3Tmlw/h7JvUvS3gsfucXPwo1+5OCNAIS0POqbV3w=; b=08YS+MCuFrWQsL5xW507TfcY8jMhhDirm+QGxNxXYoiZs6XWNr8XGqYBWxUtGKzisD zhV0VVBX/+HBpbXPyVlVvlXOAs3wxPCJzVsQe2bBqD0e1e8B23AUFpA7CmpAaLIPFyqX 7wrDXvmZ3XjCJ3yM5L0QXSeM6huxUbIaLMx60E4gCFkvq5JdhHwh2eXbfsoZtMgRgjdn 5622/O/g79UQXvV1EEppoMbEQs88ibuGvnDh7dMwWd1FvreZa/gyqjfUIx2pc18y9EVA oinpQsiLw9FJXHrO44j33deUNzGp7pefkyjOmEmKUQ1eJrpTh1b2W3A9yC/5En4/JP72 g6Pg== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to:message-id:subject:mime-version:content-type :x-original-sender:reply-to:precedence:mailing-list:list-id :x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=d1Q3Tmlw/h7JvUvS3gsfucXPwo1+5OCNAIS0POqbV3w=; b=tF1E6yonUllABVx0ogeyeDfWwEeKGSNpT04F5F+4ppDpJUrhcXUNI2hDnnG4a6sh4v E/YRSk/OVcf9kT5rCkeEclQTEcrKMn8sqxlczsE9xzKpny3zN9bKLd8NIuxSfEFmiVf4 oKr8iH73rs9Aj7NSwwXJQ2oysYQ0P4kHYgfaq8nHxzMWjTOM6Ix/TYTbiBXtUbRw0jPW 9SdqEgGQLZ7aw1imDK0wRGiuaCUCTqBN1TquoUmZNybWASJl/mVt81ZGxFvihJfQh3hF 4nFbWp2P8VIl33aMfxzzUtCfV98Q+3lZtZ9W4FKl6F/OgBrdzDVp/uh+vkeebJYUEGBN iYSA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:date:from:to:message-id:subject:mime-version :content-type:x-original-sender:reply-to:precedence:mailing-list :list-id:x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=d1Q3Tmlw/h7JvUvS3gsfucXPwo1+5OCNAIS0POqbV3w=; b=OE52KDALqcxjk26/ILx1WJCmAsQvhnbDUejp1Zubyh3xa59eZW30jBUIGYNEk/wRuf bVBNSqw/BDPBF1OpYfXUzH9y3qD02gDeqvQ4e7zv+uqdKpHhIoonvyYZdttZ1hzSnSf5 jyERndrjD0NFsLICn4KFNqe3v6dr5n2iTSkH27SDOKvYqgbDEqlIe7nXXmGZuZMgCXSD XkJ6EcIygwSwg1kjqNKAdcUIc0Ajfm9xspU3lzmrKRBB6Sq8TBmQJYzPpDILbmVwlvKG YsXycdomntEWk1YLy/97L4ThC+b0Ek1Lr2L2/ge5MREMDTQ1K/gksDyceduxMmdHB9ka ifXQ== X-Gm-Message-State: AG10YOQDzfAC/Bh3mHq/Xwp7zXfNm1Mv8QYDZHR+6hhz9TtC6ZOZ1y74psqV0Lq6nc5IkA== X-Received: by 10.13.227.133 with SMTP id m127mr3940898ywe.1.1453488744039; Fri, 22 Jan 2016 10:52:24 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.107.9.101 with SMTP id j98ls959100ioi.13.gmail; Fri, 22 Jan 2016 10:52:21 -0800 (PST) X-Received: by 10.50.114.132 with SMTP id jg4mr189410igb.1.1453488741714; Fri, 22 Jan 2016 10:52:21 -0800 (PST) X-Original-Sender: gufideg@gmail.com Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Spam-Checked-In-Group: std-proposals@isocpp.org X-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:23939 Archived-At: ------=_Part_975_379361640.1453488740671 Content-Type: text/plain; charset=UTF-8 Hi. I've been thinking about N4447 lately. First, this proposal is wonderful. It's something I dreamt of a long time. Thanks everyone. I have a question about it: the syntax use the `...` To expand the result. Does this mean it follows all the same rules as the parameter pack expansion? Let me explain. Let's say we have this struct: template struct Member { constexpr Memeber(T Class::*aMember, const char* aName) : member{aMember}, name{aName} {} using Type = T; T Class::*member; const char* name; }; template constexpr auto makeMember(T Class::*member, const char* name) { return Member{member, name}; } With the current proposal, is it possible to write something like this? constexpr auto members = std::make_tuple( makeMember(typedef, typeid)... ); Note that I used both `typedef<...>`and `typeid<...>` with the same expansion. -- --- You received this message because you are subscribed to the Google Groups "ISO C++ Standard - Future Proposals" group. 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