220 31505 <cba4201d-6ef5-8a89-b144-e849f6de5b06@wanadoo.fr> article
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From: "Vicente J. Botet Escriba" <vicente.botet@wanadoo.fr>
Newsgroups: gmane.comp.lang.c++.isocpp.proposals
Subject: Re: Re: compressed std::bitset<N>
Date: Wed, 8 Mar 2017 13:29:30 +0100
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Le 21/02/2017 =C3=A0 21:40, ricky.65@hotmail.com a =C3=A9crit :
> Hi Vicente,
>
> 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=20
> but with enhanced functionality. It let's you set the underlying=20
> integral type of the bitset. In fact, it defaults to uint8_t,=20
> uint16_t, or uint32_t if N bits fit into those integers. I would like=20
> this functionality added to std::bitset but, as you said, it would=20
> 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.

The template parameter in=20
https://github.com/ClaasBontus/bitset2/blob/master/bitset2.hpp#L50 seam=20
artificial an unnecesary. A static assert should work here.

A would like a trivial type implementation, so that we can use it where=20
we used before an int16_t e.g.

I don't have a use case for
# Additional constexpr operator |+| for adding two bitset2 objects.
# Additional operators |++|, |--|, |+=3D|.

and IMO this is shouldn't be a numeric type.

Vicente

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<html>
  <head>
    <meta content=3D"text/html; charset=3Dutf-8" http-equiv=3D"Content-Type=
">
  </head>
  <body bgcolor=3D"#FFFFFF" text=3D"#000000">
    <div class=3D"moz-cite-prefix">Le 21/02/2017 =C3=A0 21:40,
      <a class=3D"moz-txt-link-abbreviated" href=3D"mailto:ricky.65@hotmail=
..com">ricky.65@hotmail.com</a> a =C3=A9crit=C2=A0:<br>
    </div>
    <blockquote
      cite=3D"mid:06e829ca-417b-470c-95ca-c661e8752f79@isocpp.org"
      type=3D"cite">
      <div dir=3D"ltr">Hi Vicente,
        <div><br>
        </div>
        <div><font face=3D"arial, sans-serif" size=3D"2">I think the <a
              moz-do-not-send=3D"true"
              href=3D"https://github.com/ClaasBontus/bitset2">Bitset2 </a>l=
ibrary
            by Claas Bontus provides what you are looking for. It's like
            std::bitset but with enhanced functionality. It let'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(5=
1,
              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>
    <br>
    The template parameter in
    <a class=3D"moz-txt-link-freetext" href=3D"https://github.com/ClaasBont=
us/bitset2/blob/master/bitset2.hpp#L50">https://github.com/ClaasBontus/bits=
et2/blob/master/bitset2.hpp#L50</a>
    seam artificial an unnecesary. A static assert should work here.<br>
    <br>
    A would like a trivial type implementation, so that we can use it
    where we used before an int16_t e.g.<br>
    <br>
    I don't have a use case for<br>
    <meta http-equiv=3D"content-type" content=3D"text/html; charset=3Dutf-8=
">
    <li>Additional constexpr operator <code>+</code> for adding two
      bitset2 objects.</li>
    <li>Additional operators <code>++</code>, <code>--</code>, <code>+=3D</=
code>.</li>
    <br>
    and IMO this is shouldn't be a numeric type.<br>
    <br>
    Vicente
  </body>
</html>

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