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<title>Issue 2988: Clause 32 cleanup missed one typename</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++20">C++20</a> status.</em></p>
<h3 id="2988"><a href="lwg-defects.html#2988">2988</a>. Clause 32 cleanup missed one <code>typename</code></h3>
<p><b>Section:</b> 32.5.2 <a href="https://wg21.link/atomics.syn">[atomics.syn]</a> <b>Status:</b> <a href="lwg-active.html#C++20">C++20</a>
 <b>Submitter:</b> Jens Maurer <b>Opened:</b> 2017-06-25 <b>Last modified:</b> 2021-02-25</p>
<p><b>Priority: </b>0
</p>
<p><b>View other</b> <a href="lwg-index-open.html#atomics.syn">active issues</a> in [atomics.syn].</p>
<p><b>View all other</b> <a href="lwg-index.html#atomics.syn">issues</a> in [atomics.syn].</p>
<p><b>View all issues with</b> <a href="lwg-status.html#C++20">C++20</a> status.</p>
<p><b>Discussion:</b></p>
<p>
<a href="https://wg21.link/p0558r1">P0558R1</a> missed updating one of the <code>std::atomic_exchange</code> 
signatures to avoid independent deduction for <code>T</code> on the second parameter.
</p>

<p><i>[
2017-06-26 Moved to Tentatively Ready after 6 positive votes on c++std-lib.
]</i></p>




<p id="res-2988"><b>Proposed resolution:</b></p>
<p>
This wording is relative to <a href="https://wg21.link/n4659">N4659</a>.
</p>

<ol>
<li><p>Edit 32.5.2 <a href="https://wg21.link/atomics.syn">[atomics.syn]</a>, header <code>&lt;atomic&gt;</code> synopsis, as indicated:</p>

<blockquote>
<pre>
template&lt;class T&gt;
T atomic_exchange(volatile atomic&lt;T&gt;*, <ins>typename atomic&lt;</ins>T<ins>&gt;::value_type</ins>) noexcept;
</pre>
</blockquote>
</li>
</ol>




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