MESSAGE
| DATE | 2016-11-16 |
| FROM | Ruben Safir
|
| SUBJECT | Subject: [Learn] Fwd: Re: ref use
|
From learn-bounces-at-nylxs.com Wed Nov 16 23:52:42 2016
Return-Path:
X-Original-To: archive-at-mrbrklyn.com
Delivered-To: archive-at-mrbrklyn.com
Received: from www.mrbrklyn.com (www.mrbrklyn.com [96.57.23.82])
by mrbrklyn.com (Postfix) with ESMTP id 49854161312;
Wed, 16 Nov 2016 23:52:42 -0500 (EST)
X-Original-To: learn-at-nylxs.com
Delivered-To: learn-at-nylxs.com
Received: from mailbackend.panix.com (mailbackend.panix.com [166.84.1.89])
by mrbrklyn.com (Postfix) with ESMTP id 59576160020
for ; Wed, 16 Nov 2016 23:52:38 -0500 (EST)
Received: from [10.0.0.62] (www.mrbrklyn.com [96.57.23.82])
by mailbackend.panix.com (Postfix) with ESMTPSA id 6DB22132C3
for ; Wed, 16 Nov 2016 23:52:38 -0500 (EST)
References: <8DBB6D36-D434-4EB9-BC1F-A4F26FD41DEE-at-liu.edu>
To: learn-at-nylxs.com
From: Ruben Safir
X-Forwarded-Message-Id: <8DBB6D36-D434-4EB9-BC1F-A4F26FD41DEE-at-liu.edu>
Message-ID:
Date: Wed, 16 Nov 2016 23:52:37 -0500
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101
Thunderbird/45.4.0
MIME-Version: 1.0
In-Reply-To: <8DBB6D36-D434-4EB9-BC1F-A4F26FD41DEE-at-liu.edu>
Subject: [Learn] Fwd: Re: ref use
X-BeenThere: learn-at-nylxs.com
X-Mailman-Version: 2.1.17
Precedence: list
List-Id:
List-Unsubscribe: ,
List-Archive:
List-Post:
List-Help:
List-Subscribe: ,
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Errors-To: learn-bounces-at-nylxs.com
Sender: "Learn"
-------- Forwarded Message --------
Subject: Re: [Learn] ref use
Date: Wed, 16 Nov 2016 12:14:00 +0000
From: Jose A. Rodriguez
To: Ruben Safir
I'm not really up to date with the latest C++ stuff. But it seems to me
you should be able to pass just a regular reference. From what I read
reference wrappers are used mainly to store references in containers
(e.g. vectors) that cannot normally hold references.
> On Nov 16, 2016, at 5:40 AM, Ruben Safir wrote:
>
> any chance your up to date on this? I need a C++ mentor ;)
>
> Reuvain
>
> PS - I hope you are feeling well.
>
>
> -------- Forwarded Message --------
> Subject: [Learn] ref use
> Date: Wed, 16 Nov 2016 05:38:18 -0500
> From: Ruben Safir
> To: learn-at-nylxs.com
>
> [This mail was also posted to comp.lang.c++.]
>
> I'm reading up on concurrency with the thread libraryis C++ Concurrency
> in action by Anthony Williams and I'm puzzled by one example having to
> do with sending references of objects through the threads. If you own
> the text, it is one page 24 where he is callable functions is
> void update_data_for_widget(widget_id w, widget_data& data);
>
> the call for the thread is
> std::thread t (update_data_for_widget, w, data); where data is an
> object, of data I suppose ;)
>
> to do this correctly he says we need to use ref and a reference wrapper
>
> std::thread t(update_data_for_widget, w, std::ref(data) );
>
> Why can't you just send a reference?
>
> std::thread t(update_data_for_widget, w, &data );
>
>
> --
> So many immigrant groups have swept through our town
> that Brooklyn, like Atlantis, reaches mythological
> proportions in the mind of the world - RI Safir 1998
> http://www.mrbrklyn.com
>
> DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002
> http://www.nylxs.com - Leadership Development in Free Software
> http://www2.mrbrklyn.com/resources - Unpublished Archive
> http://www.coinhangout.com - coins!
> http://www.brooklyn-living.com
>
> Being so tracked is for FARM ANIMALS and and extermination camps,
> but incompatible with living as a free human being. -RI Safir 2013
> _______________________________________________
> Learn mailing list
> Learn-at-nylxs.com
> http://lists.mrbrklyn.com/mailman/listinfo/learn
>
>
_______________________________________________
Learn mailing list
Learn-at-nylxs.com
http://lists.mrbrklyn.com/mailman/listinfo/learn
|
|
