220 19946 <3868cc40-7a3c-4502-891a-50dd952e8196@isocpp.org> article Path: news.gmane.org!not-for-mail From: robinsfr@gmail.com Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: default arguments Date: Thu, 20 Aug 2015 20:13:22 -0700 (PDT) Lines: 122 Approved: news@gmane.org Message-ID: <3868cc40-7a3c-4502-891a-50dd952e8196@isocpp.org> References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_183_1689897880.1440126802365" X-Trace: ger.gmane.org 1440126806 8722 80.91.229.3 (21 Aug 2015 03:13:26 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 21 Aug 2015 03:13:26 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCQ5LBULYYOBBU5O3KXAKGQEAK5GZZI@isocpp.org Fri Aug 21 05:13:26 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pa0-f69.google.com ([209.85.220.69]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1ZSclh-0000zi-SP for gclcip-std-proposals@m.gmane.org; Fri, 21 Aug 2015 05:13:26 +0200 Original-Received: by paom9 with SMTP id m9sf53507610pao.0 for ; Thu, 20 Aug 2015 20:13:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to:message-id:in-reply-to:references: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=oP+s53jCWGBJ91bt048jMOXtHM1CcOAVL13H0BmswW4=; b=nYC0pgqpIg4Pb08WBLJViyMqjYA6HCOHn3ELAJfn49Rn/ovNguGXby/hKILUTXSvTT cFr/qEr/dIVHvHPx8fP3EKaJxLhGjhst/2u/L2isJSUpw9jelUh80B9JtKyjnv83xD0J TD/k/JYLnf3KlFrTGstWHhu4t5H7jOUGxvQ8uXOaeU/PnGoMxC+R47XXvwZ4ATNyPQLO lHWxH0R4wte6jYgtbcx+FGFjhOSjPBRHlKsYnlc1VVVDIBVpFS1GGpLp5R9dtHYqOjL5 UXZgr8iyL6QN/HZ7UVuib2kK/oUwkkvEGxHHgUNFBwdy1ug9tc1ERVkGJKP3RfEPg5Ok ic1g== 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:in-reply-to:references :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=oP+s53jCWGBJ91bt048jMOXtHM1CcOAVL13H0BmswW4=; b=Uuq//7lxu46Jw/GZBpw0QuvuIFRr+ewzniZ5VZgTWgS1jojnA0X9JHqeXJ3vA+dUaw h8CGIMF125L+ay2EkiZRiBJrsCO/x8dEF1zbbtTL7CWzvx5ZMGl6x7zVfFyFjCd9oE+u vaTHleftTCgX/K+A2KTS/KO0D5ZTaKXRBRrn9+9z+Jyt3CYbLCtvNV2pdllVPbc2TSwb OOEU4F4z+IhP6BU/dIQszTdFAhQODhExGPc9+0CrHomBcuTD9G/9UHFKev7rJcNt+SOM gIobUq1Q5hfwQwe64RU2JGEQC5YZb7LGdtrfcdLc0siKRD+gr66Hain/W6dBr7eRr8+h 51QQ== X-Gm-Message-State: ALoCoQnVkTCuqWPs9mtH1pGfzVfrKgmaump+k5IIzXrlUcZC/pyy4j65AvrUHWHw+JUigMpVZaSX X-Received: by 10.68.233.100 with SMTP id tv4mr4908236pbc.0.1440126804576; Thu, 20 Aug 2015 20:13:24 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.50.25.130 with SMTP id c2ls399473igg.12.gmail; Thu, 20 Aug 2015 20:13:23 -0700 (PDT) X-Received: by 10.50.153.79 with SMTP id ve15mr21385igb.9.1440126803572; Thu, 20 Aug 2015 20:13:23 -0700 (PDT) In-Reply-To: X-Original-Sender: robinsfr@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:19946 Archived-At: ------=_Part_183_1689897880.1440126802365 Content-Type: multipart/alternative; boundary="----=_Part_184_522610569.1440126802365" ------=_Part_184_522610569.1440126802365 Content-Type: text/plain; charset=UTF-8 Elegant. I'm tired of function overload permutations and work-around tricks like chained setters or passing structures, when all I really want sometimes is the default value of a defaultable parameter which isn't the last parameter. It's nice to see that two other people have independently come to the same idea, you and Daniel Gutson (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1466.pdf). While named parameters may be *even* nicer in general, the two proposals are not mutually exclusive. For example, when I need to update the formatting where most of the parameters are defaultable, I can just say: ChangeFormat( L"Segoe UI" ); But that one time I actually need to set an explicit stretch, then I need to specify all the parameters before it: :/ ChangeFormat( L"Segoe UI", DWRITE_FONT_WEIGHT_NORMAL, DWRITE_FONT_STYLE_NORMAL, DWRITE_FONT_STRETCH_CONDENSED ); When what I really want is simply: ChangeFormat( L"Segoe UI", default, default, DWRITE_FONT_STRETCH_CONDENSED ); You could even combine named parameters with default values (again, they are not mutually exclusive proposals): ChangeFormat( fontFamily: L"Segoe UI", fontWeight: default, fontSlope: default, fontStretch: DWRITE_FONT_STRETCH_CONDENSED ); -- --- 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. 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Elegant. I'm tired of function overload permutati= ons and work-around tricks like chained setters or passing structures, when= all I really want sometimes is the default value of a defaultable paramete= r which isn't the last parameter. It's nice to see that two other p= eople have independently come to the same idea, you and Daniel Gutson (http= ://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1466.pdf). While named= parameters may be even nicer in general, the two proposals are not = mutually exclusive.

For example, when I need to up= date the formatting where most of the parameters are defaultable, I can jus= t say:

= =C2=A0=C2=A0=C2=A0 ChangeFormat(
=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 L= "Segoe UI"
=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 );

But that one time I actually need to set an explicit stretch, then I need= to specify all the parameters before it: :/

=C2=A0=C2=A0=C2=A0 ChangeFormat(
= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 L"Segoe UI",
=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 DWRITE_FONT_WEIGHT_NORMAL,
=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 DWRITE_FONT_STYLE_NORMAL,
=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 DWRITE_FONT_STRETCH_CONDENSED
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 );

When what I really want= is simply:

=C2=A0=C2=A0=C2=A0 ChangeFormat(
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 L"Segoe UI",
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 default,
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 default,
=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 DWRITE_FONT_STRETCH_CONDENSED
=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0 );

=
You could even=C2=A0combine named parameters with default= values (again, they are not mutually exclusive proposals):

<= /div>
=C2=A0=C2=A0=C2=A0 Chan= geFormat(
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 fontFamily: L"= Segoe UI",
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 fontWeight: d= efault,
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 fontSlope: default,=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 fontStretch: DWRITE_FONT_STRET= CH_CONDENSED
=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 );

--

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