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<title>Issue 1227: &lt;bitset&gt; synopsis overspecified</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="1227"><a href="lwg-defects.html#1227">1227</a>. <code>&lt;bitset&gt;</code> synopsis overspecified</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> Bo Persson <b>Opened:</b> 2009-10-05 <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>
The resolutions to some library defect reports, like <a href="lwg-defects.html#1178" title="Header dependencies (Status: C++11)">1178</a><sup><a href="https://cplusplus.github.io/LWG/issue1178" title="Latest snapshot">(i)</a></sup>
requires that <code>#includes</code> in each synopsis should be taken
literally. This means that the <code>&lt;bitset&gt;</code> header now
<em>must</em> include <code>&lt;stdexcept&gt;</code>, even though none of the
exceptions are mentioned in the <code>&lt;bitset&gt;</code> header.
</p>
<p>
Many other classes are required to throw exceptions like
<code>invalid_argument</code> and <code>out_of_range</code>, without explicitly
including <code>&lt;stdexcept&gt;</code> in their synopsis. It is totally
possible for implementations to throw the needed exceptions from utility
functions, whose implementations are not visible in the headers.
</p>
<p>
I propose that <code>&lt;stdexcept&gt;</code> is removed from the
<code>&lt;bitset&gt;</code> header.
</p>

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


<blockquote><p>
Moved to Ready.
</p></blockquote>



<p id="res-1227"><b>Proposed resolution:</b></p>
<p>
Change 22.9.2 <a href="https://wg21.link/template.bitset">[template.bitset]</a>:
</p>

<blockquote><pre>
#include &lt;cstddef&gt;        // for size_t
#include &lt;string&gt;
<del>#include &lt;stdexcept&gt;      // for invalid_argument,</del>
                          <del>// out_of_range, overflow_error</del>
#include &lt;iosfwd&gt;         // for istream, ostream
namespace std {
...
</pre></blockquote>





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