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<title>Issue 2060: unique_ptr&lt;T[]&gt;(nullptr_t) missing noexcept</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#NAD_Editorial">NAD Editorial</a> status.</em></p>
<h3 id="2060"><a href="lwg-closed.html#2060">2060</a>. <code>unique_ptr&lt;T[]&gt;(nullptr_t)</code> missing <code>noexcept</code></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#NAD_Editorial">NAD Editorial</a>
 <b>Submitter:</b> Howard Hinnant, Paolo Carlini <b>Opened:</b> 2011-05-27 <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#NAD Editorial">NAD Editorial</a> status.</p>
<p><b>Discussion:</b></p>
<p>
The synopsis in 20.3.1.3 <a href="https://wg21.link/unique.ptr.single">[unique.ptr.single]</a> specifies:
</p><blockquote><pre>
constexpr unique_ptr(nullptr_t) noexcept
</pre></blockquote><p>
which looks correct to me.  However the corresponding constructor in 20.3.1.4 <a href="https://wg21.link/unique.ptr.runtime">[unique.ptr.runtime]</a> is missing <code>noexcept</code>:
</p><blockquote><pre>
constexpr unique_ptr(nullptr_t) : unique_ptr() { }
</pre></blockquote>

<p><i>[Bloomington, 2011]</i></p>

<p>
Closed as NAD Editorial.
</p>



<p id="res-2060"><b>Proposed resolution:</b></p>
<p>This wording is relative to the FDIS.</p>
<ol>
<li><p>Modify the synopsis in 20.3.1.4 <a href="https://wg21.link/unique.ptr.runtime">[unique.ptr.runtime]</a>:</p>
<blockquote><pre>
namespace std {
  template &lt;class T, class D&gt; class unique_ptr&lt;T[], D&gt; {
  public:
    typedef see below pointer;
    typedef T element_type;
    typedef D deleter_type;

    // 20.7.1.3.1, constructors
    constexpr unique_ptr() noexcept;
    [&hellip;]
    constexpr unique_ptr(nullptr_t) <ins>noexcept</ins> : unique_ptr() { }
	
    [&hellip;]
  };
}
</pre></blockquote>
</li>
</ol>





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