220 31507 <538fc521-2e25-4788-b3cd-a065d1151671@isocpp.org> article
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From: Nicol Bolas <jmckesson@gmail.com>
Newsgroups: gmane.comp.lang.c++.isocpp.proposals
Subject: Re: Re: compressed std::bitset<N>
Date: Wed, 8 Mar 2017 06:38:55 -0800 (PST)
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On Wednesday, March 8, 2017 at 7:29:33 AM UTC-5, Vicente J. Botet Escriba=
=20
wrote:
>
> Le 21/02/2017 =C3=A0 21:40, rick...@hotmail.com <javascript:> a =C3=A9cri=
t :
>
> Hi Vicente,=20
>
> I think the Bitset2 <https://github.com/ClaasBontus/bitset2>library by=20
> Claas Bontus provides what you are looking for. It's like std::bitset but=
=20
> with enhanced functionality. It let's you set the underlying integral typ=
e=20
> of the bitset. In fact, it defaults to uint8_t, uint16_t, or uint32_t if =
N bits=20
> fit into those integers. I would like this functionality added to=20
> std::bitset but, as you said, it would probably be a breaking change.
>
> Thanks for the link. Yes, this is close to what I need and in addition=20
> generalize well to more than 64 bits.
>
> As we would have span soon,  the data() function should IMO return a span=
..
>

In which case it should not be called `data`. The current uses of that=20
function return a pointer, not a `span` or a range.

--=20
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<div dir=3D"ltr"><br><br>On Wednesday, March 8, 2017 at 7:29:33 AM UTC-5, V=
icente J. Botet Escriba wrote:<blockquote class=3D"gmail_quote" style=3D"ma=
rgin: 0;margin-left: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;">
 =20
   =20
 =20
  <div bgcolor=3D"#FFFFFF" text=3D"#000000">
    <div>Le 21/02/2017 =C3=A0 21:40,
      <a href=3D"javascript:" target=3D"_blank" gdf-obfuscated-mailto=3D"ou=
wQDnPPCwAJ" rel=3D"nofollow" onmousedown=3D"this.href=3D&#39;javascript:&#3=
9;;return true;" onclick=3D"this.href=3D&#39;javascript:&#39;;return true;"=
>rick...@hotmail.com</a> a =C3=A9crit=C2=A0:<br>
    </div>
    <blockquote type=3D"cite">
      <div dir=3D"ltr">Hi Vicente,
        <div><br>
        </div>
        <div><font size=3D"2" face=3D"arial, sans-serif">I think the <a hre=
f=3D"https://github.com/ClaasBontus/bitset2" target=3D"_blank" rel=3D"nofol=
low" onmousedown=3D"this.href=3D&#39;https://www.google.com/url?q\x3dhttps%=
3A%2F%2Fgithub.com%2FClaasBontus%2Fbitset2\x26sa\x3dD\x26sntz\x3d1\x26usg\x=
3dAFQjCNGK_wFmX3DVScYeyAQGywgQn25crA&#39;;return true;" onclick=3D"this.hre=
f=3D&#39;https://www.google.com/url?q\x3dhttps%3A%2F%2Fgithub.com%2FClaasBo=
ntus%2Fbitset2\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNGK_wFmX3DVScYeyAQGyw=
gQn25crA&#39;;return true;">Bitset2 </a>library
            by Claas Bontus provides what you are looking for. It&#39;s lik=
e
            std::bitset but with enhanced functionality. It let&#39;s you
            set the underlying integral type of the bitset. In fact, it=C2=
=A0<span style=3D"color:rgb(51,51,51)">defaults to uint8_t,
              uint16_t, or uint32_t=C2=A0</span><span style=3D"color:rgb(51=
,51,51)">if N</span><span style=3D"color:rgb(51,51,51)">=C2=A0bits
              fit into those integers.</span>=C2=A0I would like this
            functionality added to std::bitset but, as you said, it
            would probably be a breaking change.</font></div>
        <div><br>
        </div>
      </div>
    </blockquote>
    Thanks for the link. Yes, this is close to what I need and in
    addition generalize well to more than 64 bits.<br>
    <br>
    As we would have span soon,=C2=A0 the data() function should IMO return=
 a
    span.<br></div></blockquote><div><br>In which case it should not be cal=
led `data`. The current uses of that function return a pointer, not a `span=
` or a range.</div><br></div>

<p></p>

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