220 8030 <641963d1-19b9-466c-a952-079344e9ff87@isocpp.org> article Path: news.gmane.org!not-for-mail From: "R. Martinho Fernandes" Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: A proposal to add call traits to the Standard Library Date: Thu, 5 Dec 2013 03:01:11 -0800 (PST) Lines: 107 Approved: news@gmane.org Message-ID: <641963d1-19b9-466c-a952-079344e9ff87@isocpp.org> References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_1290_29226541.1386241271742" X-Trace: ger.gmane.org 1386241271 21423 80.91.229.3 (5 Dec 2013 11:01:11 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 5 Dec 2013 11:01:11 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDXL3FEUYQARB6FZQGKQKGQENWR5OUI@isocpp.org Thu Dec 05 12:01:17 2013 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pd0-f197.google.com ([209.85.192.197]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1VoWgF-0000zI-Eq for gclcip-std-proposals@m.gmane.org; Thu, 05 Dec 2013 12:01:15 +0100 Original-Received: by mail-pd0-f197.google.com with SMTP id v10sf47003420pde.0 for ; Thu, 05 Dec 2013 03:01:13 -0800 (PST) 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=KzXmiOQDRqytynLwwbrRTh6S4O9EI+jQcPjQV0MVtHw=; b=jA6wGLHaUHHcl50wZJby2FmVaCA5BQmvmPHp3pwBfNfw94PQZNHj2cLgkcMRuj6F8S rNWZ8c5dHBFMcIhkSlgdsHC3VmHVhR6snvIRs0YAp9Dj9PUW6I2rudPZa3J+kKESFV9G suBJOJnOuxU1YFOK/qnXAs2b6WezivStcTQCKZ/E8eLqsZxVyv8tpTYSrIgA5NcQ8lQ4 Y1RXj/6ffpBtCsWwhi13u7N/CA2+93jgdCdAPDcaZVanWRM51iYrw2ugK92pw3qO1WzC oHJA/enSGhEKUNDhm522mGGDcVpN6cASId8p4+PntPRqCNZhU20CVZMDUkKTuyaknhKE VLsg== 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=KzXmiOQDRqytynLwwbrRTh6S4O9EI+jQcPjQV0MVtHw=; b=EqBMzhO1ZrwtXCnmeWSv/uKN4dYG1J77bFSsh+2m4AJxlAc5gbcCsC9VVH6XsX9JhJ nicjByZuJgFdbm6f2i/nfQuXVdI0O8RLtT26PQdTSFtWgPxZmFHR6Voz7zLOgj5he08I DFy3vhjtRlcP7Rgfy+1iX5Puq1R6eHOlcykPqxpASSpDOjMvQdqGaEOSdOmqpYBmw/pM djs0E6kpKYuFwyzr9gJMExC3OZ4EdXvdbP/lHqkTeWoWWUvRlODcq/xjh+d0HGnURIUU bFm5vJ8Q8HwVKeW4MCLe1yDlZDspjCt4ohiFbDMYg35UxJ1d4zKjzWiB8Hn3s7iSvGPp GLXQ== X-Gm-Message-State: ALoCoQkK+plFmVMiXYymURoXx0PxBryfhXdnQQga3y5kQz0HC2Sa+xgQ4wn1SGZa/nJoLpsLG+iu X-Received: by 10.66.153.137 with SMTP id vg9mr47719pab.43.1386241273340; Thu, 05 Dec 2013 03:01:13 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.49.84.234 with SMTP id c10ls578949qez.50.gmail; Thu, 05 Dec 2013 03:01:12 -0800 (PST) X-Received: by 10.49.25.103 with SMTP id b7mr41099qeg.19.1386241272405; Thu, 05 Dec 2013 03:01:12 -0800 (PST) In-Reply-To: X-Original-Sender: martinho.fernandes@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:8030 Archived-At: ------=_Part_1290_29226541.1386241271742 Content-Type: text/plain; charset=ISO-8859-1 On Thursday, December 5, 2013 4:35:00 AM UTC+1, Joshua Boyce wrote: > > On Wed, Dec 4, 2013 at 9:23 PM, R. Martinho Fernandes < > martinho....@gmail.com > wrote: > >> I have written a lot of generic code that uses callable objects and I >> never needed this, so I got curious about the use cases (i.e. that "I must >> be missing something" feeling). However the proposal document does not >> provide an example. It provides an artificial example of usage, but that >> isn't convincing because "You can use it to demonstrate the feature >> featured in this proposal" is not an interesting example. >> >> > I use my own implementation of something like this in what is effectively > a JIT wrapper. (I take a C++ function pointer plus the args to call it > with, and then inspect the arity/parameter types/return type to generate > assembly code on the fly -- using a JIT library (AsmJit) with a more 'C > with Classes' style interface -- which is then injected into another > process. > To support non-overloaded function pointers there's no need for traits. template void f(R(*)(A...)); -- --- 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_1290_29226541.1386241271742 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
On Thursday, December 5, 2013 4:35:00 AM UTC+1, Joshua Boy= ce wrote:
On Wed, Dec 4, 2013 at 9:23 PM, R. Martinho Fernandes <martinho....@gmail.com> wrote:
I have written a lot of generic code= that uses callable objects and I never needed this, so I got curious about= the use cases (i.e. that "I must be missing something" feeling). However t= he proposal document does not provide an example. It provides an artificial= example of usage, but that isn't convincing because "You can use it to dem= onstrate the feature featured in this proposal" is not an interesting examp= le.

 
<= div>I use my own implementation of something like this in what is effective= ly a JIT wrapper. (I take a C++ function pointer plus the args to call it w= ith, and then inspect the arity/parameter types/return type to generate ass= embly code on the fly -- using a JIT library (AsmJit) with a more 'C with C= lasses' style interface -- which is then injected into another process.

--
 
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