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<title>Issue 298: ::operator delete[] requirement incorrect/insufficient</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#CD1">CD1</a> status.</em></p>
<h3 id="298"><a href="lwg-defects.html#298">298</a>. ::operator delete[] requirement incorrect/insufficient</h3>
<p><b>Section:</b> 17.6.3.3 <a href="https://wg21.link/new.delete.array">[new.delete.array]</a> <b>Status:</b> <a href="lwg-active.html#CD1">CD1</a>
 <b>Submitter:</b> John A. Pedretti <b>Opened:</b> 2001-01-10 <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#new.delete.array">issues</a> in [new.delete.array].</p>
<p><b>View all issues with</b> <a href="lwg-status.html#CD1">CD1</a> status.</p>
<p><b>Discussion:</b></p>
<p>
The default behavior of <code>operator delete[]</code> described in 18.5.1.2, p12 -
namely that for non-null value of <i>ptr</i>, the operator reclaims storage
allocated by the earlier call to the default <code>operator new[]</code> - is not
correct in all cases. Since the specified <code>operator new[]</code> default
behavior is to call <code>operator new</code> (18.5.1.2, p4, p8), which can be
replaced, along with <code>operator delete</code>, by the user, to implement their
own memory management, the specified default behavior of<code> operator
delete[]</code> must be to call <code>operator delete</code>.
</p>


<p id="res-298"><b>Proposed resolution:</b></p>
<p>Change 18.5.1.2, p12 from</p>
<blockquote><p>
<b>-12-</b> <b>Default behavior:</b></p>
<ul>
<li>
For a null value of <i><code>ptr</code></i> , does nothing.
</li>
<li>
Any other value of <i><code>ptr</code></i> shall be a value returned
earlier by a call to the default <code>operator new[](std::size_t)</code>.
[Footnote: The value must not have been invalidated by an intervening
call to <code>operator delete[](void*)</code> (16.4.5.9 <a href="https://wg21.link/res.on.arguments">[res.on.arguments]</a>).
--- end footnote]
For such a non-null value of <i><code>ptr</code></i> , reclaims storage
allocated by the earlier call to the default <code>operator new[]</code>.
</li>
</ul>
</blockquote>

<p>to</p>

<blockquote><p>
<b>-12-</b> <b>Default behavior: </b>Calls <code>operator
delete(</code><i>ptr</i>)
or <code>operator delete(<i>ptr</i>, std::nothrow)</code> respectively.
</p></blockquote>
<p>and expunge paragraph 13.</p>




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