220 10449 <567223bf-127c-4d55-8be4-5c5915e1f561@isocpp.org> article Path: news.gmane.org!not-for-mail From: maksimpustovoyt@gmail.com Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Add compiler time attributes like c# Date: Wed, 30 Apr 2014 09:38:30 -0700 (PDT) Lines: 216 Approved: news@gmane.org Message-ID: <567223bf-127c-4d55-8be4-5c5915e1f561@isocpp.org> References: <85900e94-bdc6-45eb-87ec-d3fd9e43d4cd@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_1384_8877558.1398875910719" X-Trace: ger.gmane.org 1398875919 15923 80.91.229.3 (30 Apr 2014 16:38:39 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 30 Apr 2014 16:38:39 +0000 (UTC) Cc: gmisocpp@gmail.com To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCRP3Q4MT4MRBB6OQSNQKGQEAFAQOPI@isocpp.org Wed Apr 30 18:38:34 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-yh0-f71.google.com ([209.85.213.71]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1WfXWj-0005v3-6T for gclcip-std-proposals@m.gmane.org; Wed, 30 Apr 2014 18:38:33 +0200 Original-Received: by mail-yh0-f71.google.com with SMTP id i57sf7118508yha.2 for ; Wed, 30 Apr 2014 09:38:32 -0700 (PDT) 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:list-post:list-help:list-archive:list-subscribe :list-unsubscribe:content-type; bh=4jLuNBQETjunI8ipAj07HOj0wqOYObIByaGNGMth0Jg=; b=TSqmqP4GktL4uwQIVCjmFa+jUUhBTPC+oFZSukcRPYQyIV0EKxvVXFmIXvH3bBF+d+ 1ZYHCNgtWrh5Wosz6HHrC2MQpaVct/Rk+g73DZLu1jgFkkmgj2nuL4qGtJd7B+S6cfp8 OoVJC7NiTc4DsJJXzdi5IZVu2xcirRvYA+lAJTI3Hlt4UFnQy/6bEGq/MC/BOHFqzNb8 DMTHy5WV3CrZwfjAmylyV1PMSkVPg74rX5QLbKCwxye/LfHd4pVqwsxDBlBlVfm7Fbn/ VGC2rhFCzYOZwk6t89pr5DJd9NMVnzMrzpY1KIDZgWuRGy8/p3b2iV5BpVb16cXBYBOB bDmw== 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:list-post:list-help:list-archive :list-subscribe:list-unsubscribe:content-type; bh=4jLuNBQETjunI8ipAj07HOj0wqOYObIByaGNGMth0Jg=; b=m+dLVaeAlo5i66h+D15weNDKCG0uRa30H24lvYqxEMP1D+/Ks8v5ZSDoUCJljTq9+/ 7JWzeqHxxdlZHJt1n+wqexzsRL4hp5hKNoexzdDtZxHilzrlmVxoIbap/jyG72HJ2HZF OLgQ7/gUtCScQfw5zf9uMjc/KfQNzpBEg848VbQf22Q6ZlzJvwBYCprwNnysUytfwdc0 ZfaEJPsaZUilxjYSaKk5LuBzhgfU/BLZa5TIOArGptjC9+raXDTcknbY8mKMGxySjhwR hj8BDym0sTvQ6GdHabwQBPvzEdY5QLVDxnt2dcnXPp3OzB8NWdcyVPWcqVz+jfCAIHmi iccQ== X-Gm-Message-State: ALoCoQkchcef8SyMAF7i+vRicpu3HOAs41ju3lK7+4NHeiVvFBFbGARIfnx7OHAUBoTW4mcitG6P X-Received: by 10.236.209.130 with SMTP id s2mr2466102yho.18.1398875912106; Wed, 30 Apr 2014 09:38:32 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.182.142.102 with SMTP id rv6ls335963obb.48.gmail; Wed, 30 Apr 2014 09:38:31 -0700 (PDT) X-Received: by 10.182.220.232 with SMTP id pz8mr38896obc.13.1398875911081; Wed, 30 Apr 2014 09:38:31 -0700 (PDT) In-Reply-To: <85900e94-bdc6-45eb-87ec-d3fd9e43d4cd@isocpp.org> X-Original-Sender: maksimpustovoyt@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:10449 Archived-At: ------=_Part_1384_8877558.1398875910719 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable This is different than C++11 attributes. This is extendable Metadata about class which you can use in real time. For example, I want to print my object in nice format. I can do something= =20 like that: [AttributeExtension] //This predefine attribute "AttributeExtension" tells= =20 compiler that this class can be used as Attribute for other classes: struct MyAttribute { string Name; string Description; MyAttribute(string name; string description=3D "") : Name(name),=20 Description(description) {} } [AttributeExtension] // This predefine attribute "AttributeExtension" tells= =20 compiler that this class can be used as Attribute for other classes: struct AgeRange {=20 int Minum; int Maximum; AgeRange(int minum; int maximum) Minum(minum), Maximum(maximum) {} } .... some time later in code... [METADATA(true)] // tells compiler to geneate meta data about my class [MyAttribute("Person", "This this class 'Person' description")] // called= =20 MyAttribute::MyAttribute("class A", "This this class 'A' description") struct Person { [MyAttribute("Fist Name")] // called MyAttribute::MyAttribute("class A",= =20 "This this class 'A' description") string FirstName; [MyAttribute("Last Name", "Person's last name")] // called=20 MyAttribute::MyAttribute("class A", "This this class 'A' description")=20 string LastName; [AgeRange(18,50)] int ValidAge; } .... some time later in code... bool CanRegisterPerson(Person &person) {=20 if (person.ValidAge < Person::Member::ValidAge::AgeRange::Minimum) return= =20 false; if (person.ValidAge > Person::Member::ValidAge::AgeRange::Maximum) return= =20 false; return true; } bool RegisterPerson(Person &person) {=20 if (!CanRegisterPerson(person)) { printf("Cannot register person %s:%s, %s:%s because age %d must be in=20 between %d and %d\n" ,person::Member::FirstName::MyAttribute::Name.c_str() ,person.FistName.c_str() ,person::Member::LastName::MyAttribute::Name.c_str() ,person.LastName.c_str() =20 ,person.Age ,Person::Member::ValidAge::AgeRange::Minimum ,Person::Member::ValidAge::AgeRange::Maximum return false; ); return true; =20 } } On Wednesday, April 30, 2014 8:59:51 AM UTC-4, gmis...@gmail.com wrote: > > This is fun. > On Thursday, May 1, 2014 12:13:44 AM UTC+12, Klaim - Jo=C3=ABl Lamotte wr= ote: >> >> C++11 already have =E2=80=8Battributes. See:=20 >> en.cppreference.com/w/cpp/language/attributes >> > Yes sadly, it's true.=20 > =20 > >> Or are you suggesting specific attributes to be standardised? >> If yes, then your example is not clear at all to me. >> >> I'd quite like to see [[warn_unused_result]] become standard. > > http://stackoverflow.com/questions/2042780/how-to-raise-warning-if-return= -value-is-disregarded-gcc-or-static-code-check > > btw. anyone think we're ready to add things like [[unused_arg]] yet? > > Thanks > --=20 ---=20 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 e= mail 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-proposa= ls/. ------=_Part_1384_8877558.1398875910719 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
This is different than C++11 attributes.
Th= is is extendable Metadata about class which you can use in real time.
=
For example, I want to print my object in nice format. I can do someth= ing like that:
[AttributeExtension]  //This predefine attribute "AttributeExtension" tells compiler that this c= lass can be used as Attribute for other classes:
struct MyAttribu= te {
    string Name;
    string Descri= ption;
    MyAttribute(string name; string description=3D= "") : Name(name), Description(description) {}
}
[AttributeExtension]= // This predefine attribute "AttributeExtension" t= ells compiler that this class can be used as Attribute for other classes:
struct AgeRange { 
    int Minum;
 = int Maximum;
 AgeRange(int minum; int maximum)  Minum(minum), = Maximum(maximum) {}
}

.= ... some time later in code...

[METADATA(true)] // tells compiler to geneat= e meta data about my class
[MyAttribute("Person", "This this clas= s 'Person' description")] // called MyAttribute::MyAttribute("class A", "Th= is this class 'A' description")
struct Person {
 [MyAttribute("F= ist Name")] // called MyAttribute::MyAttribute("class A", "This this class = 'A' description")
 string FirstName;
 [MyAttribute("Last Na= me", "Person's last name")] // called MyAttribute::MyAttribute("class A", "= This this class 'A' description") 
 string LastName;
 = [AgeRange(18,50)]
 int ValidAge;
}

... some time later in code...

bool CanRegisterPerson(Person &person) {&nb= sp;
 if (person.ValidAge < Person::Member::ValidAge::AgeRange::M= inimum) return false;
 if (person.ValidAge > Person::Member::Val= idAge::AgeRange::Maximum) return false;
 return true;
}

bool RegisterPerson(Person &person) { 
 i= f (!CanRegisterPerson(person)) {
  printf("Cannot register per= son %s:%s, %s:%s because age %d must be in between %d and %d\n"
 &n= bsp; ,person::Member::FirstName::MyAttribute::Name.c_str()
 &n= bsp; ,person.FistName.c_str()
   ,person::Member::La= stName::MyAttribute::Name.c_str()
   ,person.LastName.c_s= tr()   
   ,person.Age
  &nbs= p;,Person::Member::ValidAge::AgeRange::Minimum
   ,Person= ::Member::ValidAge::AgeRange::Maximum
   return false;  );
  return true;  
 }
}



On Wednesday, Ap= ril 30, 2014 8:59:51 AM UTC-4, gmis...@gmail.com wrote:

This is fun.
On Thursday, May 1, 201= 4 12:13:44 AM UTC+12, Klaim - Jo=C3=ABl Lamotte wrote:
C++11 already have =E2=80=8Battributes. See:&= nbsp;en.cppreference.com/w/cpp/la= nguage/attributes
Yes sadly, it's true. 
&n= bsp;
Or are you sug= gesting specific attributes to be standardised?
If yes, then your example is not clear at all to me.

I'd quite like to see [[warn_unused_result= ]] become standard.

btw. anyone think= we're ready to add things like [[unused_arg]] yet?

Thanks

--

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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.
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