<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Issue 1113: bitset::to_string could be simplified</title>
<meta property="og:title" content="Issue 1113: bitset::to_string could be simplified">
<meta property="og:description" content="C++ library issue. Status: C++11">
<meta property="og:url" content="https://cplusplus.github.io/LWG/issue1113.html">
<meta property="og:type" content="website">
<meta property="og:image" content="http://cplusplus.github.io/LWG/images/cpp_logo.png">
<meta property="og:image:alt" content="C++ logo">
<style>
  p {text-align:justify}
  li {text-align:justify}
  pre code.backtick::before { content: "`" }
  pre code.backtick::after { content: "`" }
  blockquote.note
  {
    background-color:#E0E0E0;
    padding-left: 15px;
    padding-right: 15px;
    padding-top: 1px;
    padding-bottom: 1px;
  }
  ins {background-color:#A0FFA0}
  del {background-color:#FFA0A0}
  table.issues-index { border: 1px solid; border-collapse: collapse; }
  table.issues-index th { text-align: center; padding: 4px; border: 1px solid; }
  table.issues-index td { padding: 4px; border: 1px solid; }
  table.issues-index td:nth-child(1) { text-align: right; }
  table.issues-index td:nth-child(2) { text-align: left; }
  table.issues-index td:nth-child(3) { text-align: left; }
  table.issues-index td:nth-child(4) { text-align: left; }
  table.issues-index td:nth-child(5) { text-align: center; }
  table.issues-index td:nth-child(6) { text-align: center; }
  table.issues-index td:nth-child(7) { text-align: left; }
  table.issues-index td:nth-child(5) span.no-pr { color: red; }
  @media (prefers-color-scheme: dark) {
     html {
        color: #ddd;
        background-color: black;
     }
     ins {
        background-color: #225522
     }
     del {
        background-color: #662222
     }
     a {
        color: #6af
     }
     a:visited {
        color: #6af
     }
     blockquote.note
     {
        background-color: rgba(255, 255, 255, .10)
     }
  }
</style>
</head>
<body>
<hr>
<p><em>This page is a snapshot from the LWG issues list, see the <a href="lwg-active.html">Library Active Issues List</a> for more information and the meaning of <a href="lwg-active.html#C++11">C++11</a> status.</em></p>
<h3 id="1113"><a href="lwg-defects.html#1113">1113</a>. <code>bitset::to_string</code> could be simplified</h3>
<p><b>Section:</b> 22.9.2 <a href="https://wg21.link/template.bitset">[template.bitset]</a> <b>Status:</b> <a href="lwg-active.html#C++11">C++11</a>
 <b>Submitter:</b> Alisdair Meredith <b>Opened:</b> 2009-05-09 <b>Last modified:</b> 2016-01-28</p>
<p><b>Priority: </b>Not Prioritized
</p>
<p><b>View other</b> <a href="lwg-index-open.html#template.bitset">active issues</a> in [template.bitset].</p>
<p><b>View all other</b> <a href="lwg-index.html#template.bitset">issues</a> in [template.bitset].</p>
<p><b>View all issues with</b> <a href="lwg-status.html#C++11">C++11</a> status.</p>
<p><b>Discussion:</b></p>
<p>
In <a href="lwg-defects.html#853" title="to_string needs updating with zero and one (Status: C++11)">853</a><sup><a href="https://cplusplus.github.io/LWG/issue853" title="Latest snapshot">(i)</a></sup> our resolution is changing the signature by adding two
defaulting arguments to 3 calls.  In principle, this means that ABI breakage
is not an issue, while API is preserved.
</p>
<p>
With that observation, it would be very nice to use the new ability to
supply default template parameters to function templates to collapse all 3
signatures into 1.  In that spirit, this issue offers an alternative resolution
than that of <a href="lwg-defects.html#853" title="to_string needs updating with zero and one (Status: C++11)">853</a><sup><a href="https://cplusplus.github.io/LWG/issue853" title="Latest snapshot">(i)</a></sup>.
</p>

<p><i>[
Batavia (2009-05):
]</i></p>

<blockquote><p>
Move to Open,
and look at the issue again after <a href="lwg-defects.html#853" title="to_string needs updating with zero and one (Status: C++11)">853</a><sup><a href="https://cplusplus.github.io/LWG/issue853" title="Latest snapshot">(i)</a></sup> has been accepted.
We further recommend this be deferred until after the next Committee Draft.
</p></blockquote>

<p><i>[
2009-10 post-Santa Cruz:
]</i></p>


<blockquote><p>
Move to Tentatively Ready.
</p></blockquote>



<p id="res-1113"><b>Proposed resolution:</b></p>

<ol style="list-style-type:upper-alpha">
<li>
<p>
In 22.9.2 <a href="https://wg21.link/template.bitset">[template.bitset]</a>/1 (class bitset) ammend:
</p>
<blockquote><pre>
template &lt;class charT <ins>= char</ins>,
            class traits <ins>= char_traits&lt;charT&gt;</ins>,
            class Allocator <ins>= allocator&lt;charT&gt;</ins>&gt; 
  basic_string&lt;charT, traits, Allocator&gt;
  to_string(charT zero = charT('0'), charT one = charT('1')) const;
<del>template &lt;class charT, class traits&gt; 
  basic_string&lt;charT, traits, allocator&lt;charT&gt; &gt; to_string() const; 
template &lt;class charT&gt; 
  basic_string&lt;charT, char_traits&lt;charT&gt;, allocator&lt;charT&gt; &gt; to_string() const; 
basic_string&lt;char, char_traits&lt;char&gt;, allocator&lt;char&gt; &gt; to_string() const;</del>
</pre></blockquote>
</li>
<li>
<p>
In 22.9.2.3 <a href="https://wg21.link/bitset.members">[bitset.members]</a> prior to p35 ammend:
</p>
<blockquote><pre>
template &lt;class charT <ins>= char</ins>,
            class traits <ins>= char_traits&lt;charT&gt;</ins>,
            class Allocator <ins>= allocator&lt;charT&gt;</ins>&gt; 
  basic_string&lt;charT, traits, Allocator&gt;
  to_string(charT zero = charT('0'), charT one = charT('1')) const;
</pre></blockquote>
</li>
<li>
Strike 22.9.2.3 <a href="https://wg21.link/bitset.members">[bitset.members]</a> paragraphs 37 -> 39 (including signature
above 37)
</li>
</ol>






</body>
</html>
