220 29701 <54f08727-b6f2-4d8f-9de9-e40d87ecc2cd@isocpp.org> article
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From: Nicol Bolas <jmckesson@gmail.com>
Newsgroups: gmane.comp.lang.c++.isocpp.proposals
Subject: Re: Add a "tuple_slice" function in <tuple>
Date: Thu, 8 Dec 2016 14:46:54 -0800 (PST)
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On Thursday, December 8, 2016 at 12:52:48 PM UTC-5, Matthew Woehlke wrote:
>
> On 2016-12-05 16:21, Vicente J. Botet Escriba wrote: 
> > Maybe you are right. The problem I see is that functions cannot return 
> > parameter packs as them are no types and so this makes composition more 
> > difficult. 
>
> Yes, I can see where composition might make it desirable to have a 
> library feature in addition. This seems similar to the case where the 
> proposed feature does not entirely obviate the need for std::apply; it 
> just means that 90% of the time you will use the language feature, and 
> in some corner cases you will still use std::apply.
>

I don't think I'd use the library feature ever. Better to just use `return 
tuple{[I1:I2]tpl...};`.

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<div dir=3D"ltr"><br><br>On Thursday, December 8, 2016 at 12:52:48 PM UTC-5=
, Matthew Woehlke wrote:<blockquote class=3D"gmail_quote" style=3D"margin: =
0;margin-left: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;">On 201=
6-12-05 16:21, Vicente J. Botet Escriba wrote:
<br>&gt; Maybe you are right. The problem I see is that functions cannot re=
turn
<br>&gt; parameter packs as them are no types and so this makes composition=
 more
<br>&gt; difficult.
<br>
<br>Yes, I can see where composition might make it desirable to have a
<br>library feature in addition. This seems similar to the case where the
<br>proposed feature does not entirely obviate the need for std::apply; it
<br>just means that 90% of the time you will use the language feature, and
<br>in some corner cases you will still use std::apply.<br></blockquote><di=
v><br>I don&#39;t think I&#39;d use the library feature ever. Better to jus=
t use `return tuple{[I1:I2]tpl...};`.<br></div></div>

<p></p>

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