220 11470 article Path: news.gmane.org!not-for-mail From: Douglas Boffey Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Named function parameters using anonymous structs for C and C++ Date: Tue, 17 Jun 2014 06:43:29 -0700 (PDT) Lines: 135 Approved: news@gmane.org Message-ID: References: <72c49240-547b-4bf6-8b27-aff6a61c1272@isocpp.org> <36D3B24B-7F24-4ED5-A27C-F4EF71CF244C@gmail.com> <29C6D83B-BD31-42A9-B7BD-2C797E3FE58C@gmail.com> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_63_29705748.1403012609765" X-Trace: ger.gmane.org 1403012620 28016 80.91.229.3 (17 Jun 2014 13:43:40 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 17 Jun 2014 13:43:40 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDSIZVXVVUFBBAUMQGOQKGQEFW4MEMY@isocpp.org Tue Jun 17 15:43:33 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-yh0-f72.google.com ([209.85.213.72]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Wwtfg-00033l-Q2 for gclcip-std-proposals@m.gmane.org; Tue, 17 Jun 2014 15:43:33 +0200 Original-Received: by mail-yh0-f72.google.com with SMTP id f10sf32190069yha.11 for ; Tue, 17 Jun 2014 06:43:31 -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 :x-original-sender:reply-to:precedence:mailing-list:list-id :list-post:list-help:list-archive:list-subscribe:list-unsubscribe :content-type; bh=tKBPpTUPKXaWIvox+nJTYnpGnXOWSBj0YeSMBC8kd1k=; b=wGljEjWcnvdgBZy/N1X6FbbgXH5vdKAQ+OfdYXi2ahlnWbnYAVhEk8d/VWQkkDXf0i 5hOtfpuRvx2L9x8n0efRLjKm2ls2eiasrZ20g7FK5fMH6KP2UQrUl0B8xMkhPGEj4Ic6 J2BvfNREtTDhLWxvqepS2b20KP7fpcqmDIbfy8ec01JOvwiOUXPMQJorFnMYCPnVnY65 aPcZDcCcO0h3hKs2GouVD6xumBH+mSrx9Voj5JqFj8C3GQ7V4W9Ax86ML5/q3BdWsk4J B6aYBWxVN1epIYMeJll9CJcv9wws/yCmXNHZ9nPxHCkUvxctUamBaiLVY3LlRiKk29a+ AudA== 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:x-original-sender:reply-to:precedence :mailing-list:list-id:list-post:list-help:list-archive :list-subscribe:list-unsubscribe:content-type; bh=tKBPpTUPKXaWIvox+nJTYnpGnXOWSBj0YeSMBC8kd1k=; b=XDe7d7SEj41MYpPRTYOjv68aKDv+R9PaMyYQh918UGXzRjY8pp/XRACXgAtTr4umMW f+SQlASR1/bJ5y1j8nWQ/oa322L+s85edfmUQ9HiUHQSxZXqHjXVpBkmGeJ2BhfGYXqS LQcDhxzWYwQ9r3vfM5XqlvK+d7aNLV1Uql7KhLLRal2J3PGcpAVn41BvPvVtku5qdoAK ZCuQsktGCq1EDcYBDgVd5lBCU6+tnm5NTzOkQ7KnEpyEHrbCyFEVMA5PF7p/E8rtgNry wBId748vCKIbd7vNK9Vj5TeyEAsi2c02neHyFYpcar9q9u6/xuWx7jBKrKfM2guSrdht SJiA== X-Gm-Message-State: ALoCoQkSgtNPhR+yFqsAiAv3vRwQ4PTImCS3c90s86MgGBH+NzYQFoY1eckY7Ht19Eiyd1RXxFTe X-Received: by 10.58.34.47 with SMTP id w15mr1083003vei.20.1403012611593; Tue, 17 Jun 2014 06:43:31 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.182.81.38 with SMTP id w6ls1930410obx.17.gmail; Tue, 17 Jun 2014 06:43:30 -0700 (PDT) X-Received: by 10.182.220.232 with SMTP id pz8mr78201obc.13.1403012610546; Tue, 17 Jun 2014 06:43:30 -0700 (PDT) In-Reply-To: <29C6D83B-BD31-42A9-B7BD-2C797E3FE58C@gmail.com> X-Original-Sender: douglas.boffey@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:11470 Archived-At: ------=_Part_63_29705748.1403012609765 Content-Type: text/plain; charset=UTF-8 On Tuesday, 17 June 2014 05:43:28 UTC+1, David Krauss wrote: > struct point { > int top, left; > }; > > struct rect { > point top_left, bottom_right; > float angle; > > rect( /* struct */ { int top, left, bottom, right; }, float in_angle = > 0 ) > : top( top ), left( left ), bottom( bottom ), right( right ), > angle( in_angle ) {} > > rect( /* struct */ { int top, left, height, width; }, float in_angle = > 0 ) > : top( in_top ), left( in_left ) > , bottom( in_top + in_width ), right( in_left + in_width ) > , angle( in_angle ) {} > > rect( /* struct */ { point top_left, point bottom_right; }, float > in_angle = 0 ) > : top_left( top_left ), bottom_right( bottom_right ), angle( > in_angle ) {} > }; > > rect a( .top = 4, .height = 43, .left = 10, .width = 100 ); // OK > rect b( .top_left = { 4, 43 }, .bottom_right = { 10, 100 } ); // OK > rect c( .top_left = 4, 43, .bottom_right = 10, 100 ); // OK: (additional) > brace elision > Please, no. That could only cause confusion, as the number of actual parameters (2) is not the number of apparent parameters (4). > rect d( .top = 4, 43, .bottom = 10, 100 ); // OK: initialize successive > members. > rect e( .top = 4, 43, 10, 100 ); // Error: ambiguous. > rect f( 4, 43, .bottom = 10, 100 ); // OK, if poor style, the user is > asking for it. > rect g( .top = 4, .bottom = 47, .left = 10, .right = 110, 35_degrees ); // > Error: mixed named and unnamed > rect h( { .top = 4, .bottom = 47, .left = 10, .right = 110 }, 35_degrees > ); // OK > > > -- --- 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. Visit this group at http://groups.google.com/a/isocpp.org/group/std-proposals/. ------=_Part_63_29705748.1403012609765 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

On Tuesday, 17 June 2014 05:43:28 UTC+1, David Kr= auss wrote:
 
<snip>
 
struct point {
    int top, left;
};

struct rect {
    point top_left, bo= ttom_right;
    float angle;

    r= ect( /* struct */ { int top, left, bottom, right; }, float in_angle =3D 0 )=
        : top( top ), left( left ), bottom( bottom = ), right( right ), angle( in_angle ) {}

    rect( /* struct */ { int top, left,= height, width; }, float in_angle =3D 0 )
        : = top( in_top ), left( in_left )
        , bottom( in_= top + in_width ), right( in_left + in_width )
        , angle( in_angle ) {= }

    rect( /* struct */ { point top_left, point bottom_ri= ght; }, float in_angle =3D 0 )
        : top_left( t= op_left ), bottom_right( bottom_right ), angle( in_angle ) {}
= };

rect a( .top =3D 4, .height =3D 43, .left =3D 10, .width =3D 100 = ); // OK
rect b( .top_left =3D { 4, 43 }, .bottom_right =3D { 10, 100 } = ); // OK
rect c( .top_left =3D 4, 43, .bottom_right =3D 10, 100 ); // OK= : (additional) brace elision
Please, no.  That could only cause confusion, as the number of ac= tual parameters (2) is not the number of apparent parameters (4).
 
rect d( .top =3D 4, 43, .bottom = =3D 10, 100 ); // OK: initialize successive members.
rect e( .top =3D 4, 43, 10, 100 ); = // Error: ambiguous.
rect f(= 4, 43, .bottom =3D 10, 100 ); // OK, if poor style, the user is asking for= it.
rect g( = ..top =3D 4, .bottom =3D 47, .left =3D 10, .right =3D 110, 35_degrees ); // = Error: mixed named and unnamed
rect h( { .top =3D 4, .bottom =3D 47, .le= ft =3D 10, .right =3D 110 }, 35_degrees ); // OK


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