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<title>Issue 2019: isblank not supported by std::locale</title>
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<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="2019"><a href="lwg-defects.html#2019">2019</a>. <code>isblank</code> not supported by <code>std::locale</code></h3>
<p><b>Section:</b> 28.3.3.3.1 <a href="https://wg21.link/classification">[classification]</a> <b>Status:</b> <a href="lwg-active.html#C++11">C++11</a>
 <b>Submitter:</b> Jonathan Wakely <b>Opened:</b> 2010-11-16 <b>Last modified:</b> 2016-01-28</p>
<p><b>Priority: </b>Not Prioritized
</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>C99 added <code>isblank</code> and <code>iswblank</code> to <code>&lt;locale.h&gt;</code> but <code>&lt;locale&gt;</code> does not
provide any equivalent.</p>

<p><i>[2011-02-24 Reflector discussion]</i></p>

<p>
Moved to Tentatively Ready after 6 votes.
</p> 


<p id="res-2019"><b>Proposed resolution:</b></p>
<p>Add to 28.3.3.3.1 <a href="https://wg21.link/classification">[classification]</a> synopsis:</p>
<blockquote><pre>
template &lt;class charT&gt; bool isgraph (charT c, const locale&amp; loc);
<ins>template &lt;class charT&gt; bool isblank (charT c, const locale&amp; loc);</ins>
</pre></blockquote>

<p>Add to 28.3.4.2 <a href="https://wg21.link/category.ctype">[category.ctype]</a> synopsis:</p>

<blockquote><pre>
static const mask xdigit = 1 &lt;&lt; 8;
<ins>static const mask blank = 1 &lt;&lt; 9;</ins>
static const mask alnum = alpha | digit;
static const mask graph = alnum | punct;
</pre></blockquote>






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