220 29617 <5876fa59-f31f-4b93-969a-8ab0437f2f55@isocpp.org> article Path: news.gmane.org!.POSTED!not-for-mail From: Nicol Bolas Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: compiler should infer last semicolon of culy brace block... it makes lambas look better.... Date: Fri, 2 Dec 2016 08:34:29 -0800 (PST) Lines: 122 Approved: news@gmane.org Message-ID: <5876fa59-f31f-4b93-969a-8ab0437f2f55@isocpp.org> References: <99df401b-562e-424f-9c17-01575f8b47e1@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_884_1915619394.1480696469605" X-Trace: blaine.gmane.org 1480696471 782 195.159.176.226 (2 Dec 2016 16:34:31 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 2 Dec 2016 16:34:31 +0000 (UTC) Cc: wm2015email@gmail.com To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCEKFTV6ZUMBBFWFQ3BAKGQEC3QOX2A@isocpp.org Fri Dec 02 17:34:27 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-qk0-f199.google.com ([209.85.220.199]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cCqn5-0007s4-34 for gclcip-std-proposals@m.gmane.org; Fri, 02 Dec 2016 17:34:27 +0100 Original-Received: by mail-qk0-f199.google.com with SMTP id q128sf208963401qkd.3 for ; Fri, 02 Dec 2016 08:34:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:message-id:in-reply-to:references:subject :mime-version: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=UYuUJ3StGLRg0DJDnk+yH1+kfGJqrLtZNwTTLO8dSag=; b=L2C55FVLP7b40ohthENZgf4AHjBb1kP5tFI7Z1SFbBTLr4kDKwma9xYkjhpIF060dH 28X4WhPfgxflmtmCj2+YYsO/D5s3jZmj2we94ISH+i2RPKK9Lf9PMAajYQq5yJRPPwIR vSfW2+RKJbKgJqjBG76CW/HvffdsLc7IIAR5+2lTf3xJHt85PQhdc7H1gERIosu306Px WSVDjRfsesfHlMhOmesGuCsxKnfmrkSLjgx6hN2ihkJhFUGwBTgZl5Xx3CruV8ToH/vD gKvohIc7Xc6e7mzagQr0dC0Dmi7MaPKQJtulFOZPSxdW52X8OFD5jqzhQkak1HKBNTpg IlKA== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to:cc:message-id:in-reply-to:references:subject :mime-version: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=UYuUJ3StGLRg0DJDnk+yH1+kfGJqrLtZNwTTLO8dSag=; b=vRIyCMMHMSK2+HrhFhzi3gcCtzAqz3Eyz23pQH6KSpQsfo+AZl4o++uRsNCwELAZyP 7dTAHcufT4Z71si4PStG2De3cKZ4ulZYYbu4KCbUFIfd20XSd5LHjSOAcXYLDnpZylLM P8nLBNDgHn8U/lECWcPYIxkxtJsqEzi1yHv5d2gd2LyCYLEFGbQR34tmPUsalvdgTgSN QfS2S6+UwyAHvyMmI701Tjh3uZ1956qQ9EdEPEeMn0hUJ+t1+3ctwdpWgywkwauk2zwF Q0sWDCRIQuww+JvH+EW5amGhzeDACeFfs0c37dn7gbHr7FiYjIqSZvgHTmYXKtWYe1ZA EkdQ== 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:cc:message-id:in-reply-to :references:subject:mime-version: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=UYuUJ3StGLRg0DJDnk+yH1+kfGJqrLtZNwTTLO8dSag=; b=XNVe0gPWmjuZca0QH2wejdTcf4b7vEC6orfjkr0BFe7Z0QXUI4IBYJ7I29CJ++AWjG YGlcOFcCVojLVs5fbitQnGyGWkI3hIWftJ0BKofhzzeoPbAXBvcXs9k6U2lHDomxhtNg rYJvsUCWDNRbjT8tgo9qOu3t8BM6n5K7oP3PPHKxS0nbUUHKjjvLok1WgNF/cqPKhaH1 LWd7t41haD0cl+y+rc5J0RHpc6M0AjNszG/396wzyQswx7SdrWm4LZLxkk0IKmw/fGEr K8uc9UzFROo5ym+8hW4hoYcOH5XMy0r3uc73sXjpscgY+mK/90h9X7vfc4isoJBF1qy9 MMsA== X-Gm-Message-State: AKaTC00moTpJ8PGZUqUeKjnXe5cQ+y+okCJWmzQdmEwSAnkZVKkvL1Fyq8y1OUXT1qiL1Q== X-Received: by 10.200.45.170 with SMTP id p39mr9305224qta.38.1480696470793; Fri, 02 Dec 2016 08:34:30 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.157.41.209 with SMTP id g17ls20668765otd.46.gmail; Fri, 02 Dec 2016 08:34:30 -0800 (PST) X-Received: by 10.157.4.119 with SMTP id 110mr3063347otc.11.1480696470114; Fri, 02 Dec 2016 08:34:30 -0800 (PST) In-Reply-To: X-Original-Sender: jmckesson@gmail.com Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: 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:29617 Archived-At: ------=_Part_884_1915619394.1480696469605 Content-Type: multipart/alternative; boundary="----=_Part_885_2086958458.1480696469606" ------=_Part_885_2086958458.1480696469606 Content-Type: text/plain; charset=UTF-8 On Friday, December 2, 2016 at 10:14:20 AM UTC-5, Jakob Riedle wrote: > > A comma is allowed there > > > Truly... > > *Concerning your Idea:* > I like it! > > > Another Idea: How about making the "return" stmt obsolete, *when there is > no semicolon *(only within a lambda)? How about being able to write > > transform(begin(str), end(str), [](auto c){ toupper(c) } ); > > *Why I said it: *Because making "return" optional when there is no > semicolon makes it a backwards-compatible change! > > Just an idea... > Look at how it conflicts with what the OP wanted: menu1.callback("Log->Clear", [=]() {dosomething1(); dosomthing2()}); With his feature, this is still a `void` function. With what you want, it's equivalent to `return dosomething2()`. That might be `void` or it might not. There's no way to tell. There are already some ideas around for making lambda-as-single-expression easier to write. -- You received this message because you are subscribed to the Google Groups "ISO C++ Standard - Future Proposals" group. To unsubscribe from this group and stop receiving emails from it, send an email to std-proposals+unsubscribe@isocpp.org. To post to this group, send email to std-proposals@isocpp.org. To view this discussion on the web visit https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/5876fa59-f31f-4b93-969a-8ab0437f2f55%40isocpp.org. ------=_Part_885_2086958458.1480696469606 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable


On Friday, December 2, 2016 at 10:14:20 AM UTC-5, = Jakob Riedle wrote:
A comma is allowed = there

Truly...

= Concerning your Idea:
I like it!

Another Idea: How about making the "return" stmt obso= lete, when there is no semicolon (only within a lambda)? How about b= eing able to write

transfo= rm(begi= n(str), end(str), [](auto c){ toupper(c) } );

Why I said it: Because making "return&q= uot; optional when there is no semicolon makes it a backwards-compatible ch= ange!

Just an idea...

Look at how it conflicts with what the OP wanted:

menu1.callback("Log->Clear", [=3D]() {dosomething1(); dosomthing2()});

With his feature, this is still a `vo= id` function. With what you want, it's equivalent to `return dosomethin= g2()`. That might be `void` or it might not. There's no way to tell.
There are already some ideas around for making lambda-as-single-expres= sion easier to write.

--
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To unsubscribe from this group and stop receiving emails from it, send an e= mail to std-proposa= ls+unsubscribe@isocpp.org.
To post to this group, send email to std-proposals@isocpp.org.
To view this discussion on the web visit https://groups.google.= com/a/isocpp.org/d/msgid/std-proposals/5876fa59-f31f-4b93-969a-8ab0437f2f55= %40isocpp.org.
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