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<title>Issue 1293: unique_ptr&lt;T[], D&gt; needs to get rid of unspecified-pointer-type</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#Resolved">Resolved</a> status.</em></p>
<h3 id="1293"><a href="lwg-defects.html#1293">1293</a>. <code>unique_ptr&lt;T[], D&gt;</code> needs to get rid of <i>unspecified-pointer-type</i></h3>
<p><b>Section:</b> 20.3.1.4 <a href="https://wg21.link/unique.ptr.runtime">[unique.ptr.runtime]</a> <b>Status:</b> <a href="lwg-active.html#Resolved">Resolved</a>
 <b>Submitter:</b> Daniel Kr&uuml;gler <b>Opened:</b> 2009-12-20 <b>Last modified:</b> 2016-01-28</p>
<p><b>Priority: </b>Not Prioritized
</p>
<p><b>View all other</b> <a href="lwg-index.html#unique.ptr.runtime">issues</a> in [unique.ptr.runtime].</p>
<p><b>View all issues with</b> <a href="lwg-status.html#Resolved">Resolved</a> status.</p>
<p><b>Discussion:</b></p>
<p><b>Addresses UK 211</b></p>

<p>
As a response to UK 211 LWG issue <a href="lwg-defects.html#1021" title="Allow nullptr_t assignments to unique_ptr (Status: C++11)">1021</a><sup><a href="https://cplusplus.github.io/LWG/issue1021" title="Latest snapshot">(i)</a></sup> has replaced the
<i>unspecified-pointer-type</i> by <code>nullptr_t</code> to allow assignment of
type-safe null-pointer literals in the non-array form of
<code>unique_ptr::operator=</code>, but did not the same for the specialization for
arrays of runtime length. But without this parallel change of the signature we
have a status quo, where <code>unique_ptr&lt;T[], D&gt;</code> declares a member
function which is completely unspecified.
</p>

<p><i>[
2009-12-21 Moved to Tentatively Ready after 5 positive votes on c++std-lib.
]</i></p>


<p><i>[
2010-03-14 Howard adds:
]</i></p>


<blockquote><p>
We moved
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3073.html">N3073</a>
to the formal motions page in Pittsburgh which should obsolete this issue.  I've
moved this issue to NAD Editorial, solved by N3073.
</p></blockquote>



<p><b>Rationale:</b></p>
<p>
Solved by <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3073.html">N3073</a>.
</p>


<p id="res-1293"><b>Proposed resolution:</b></p>
<p>
In 20.3.1.4 <a href="https://wg21.link/unique.ptr.runtime">[unique.ptr.runtime]</a>, class template <code>unique_ptr&lt;T[],
D&gt;</code> synopsis, change as indicated:
</p>

<blockquote><pre>
// assignment
unique_ptr&amp; operator=(unique_ptr&amp;&amp; u);
unique_ptr&amp; operator=(<del><i>unspecified-pointer-type</i></del><ins>nullptr_t</ins>);
</pre></blockquote>






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