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<title>Issue 1006: operator delete in garbage collected implementation</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="1006"><a href="lwg-defects.html#1006">1006</a>. <code>operator delete</code> in garbage collected implementation</h3>
<p><b>Section:</b> 17.6.3 <a href="https://wg21.link/new.delete">[new.delete]</a> <b>Status:</b> <a href="lwg-active.html#C++11">C++11</a>
 <b>Submitter:</b> Alisdair Meredith <b>Opened:</b> 2009-03-11 <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">issues</a> in [new.delete].</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><b>Addresses UK 190</b></p>

<p>
It is not entirely clear how the current specification acts in the
presence of a garbage collected implementation.
</p>

<p><i>[
Summit:
]</i></p>

 
<blockquote><p>
Agreed.
</p></blockquote>

<p><i>[
2009-05-09 Alisdair adds:
]</i></p>


<blockquote><p>
Proposed wording is too strict for implementations that do not support
garbage collection.  Updated wording supplied.
</p></blockquote>

<p><i>[
Batavia (2009-05):
]</i></p>

<blockquote><p>
We recommend advancing this to Tentatively Ready
with the understanding that it will not be moved for adoption
unless and until the proposed resolution to Core issue #853 is adopted.
</p></blockquote>


<p id="res-1006"><b>Proposed resolution:</b></p>

<p>
(Editorial note: This wording ties into the proposed
resolution for Core #853)
</p>

<p>
Add paragraphs to 17.6.3.2 <a href="https://wg21.link/new.delete.single">[new.delete.single]</a>:
</p>

<blockquote><pre>
void operator delete(void* ptr) throw();
<del>void operator delete(void* ptr, const std::nothrow_t&amp;) throw();</del>
</pre>

<p><i>[
The second signature deletion above is editorial.
]</i></p>


<blockquote>
<p><ins>
<i>Requires:</i> If an implementation has strict pointer safety
( [basic.stc.dynamic.safety]) then <code>ptr</code> shall
be a safely-derived pointer.
</ins></p>

<p>-10- ...</p>
</blockquote>

<pre>
void operator delete(void* ptr, const std::nothrow_t&amp;) throw();
</pre>

<blockquote>
<p><ins>
<i>Requires:</i> If an implementation has strict pointer safety
( [basic.stc.dynamic.safety]) then <code>ptr</code> shall
be a safely-derived pointer.
</ins></p>

<p>-15- ...</p>
</blockquote>

</blockquote>

<p>
Add paragraphs to 17.6.3.3 <a href="https://wg21.link/new.delete.array">[new.delete.array]</a>:
</p>

<blockquote><pre>
void operator delete[](void* ptr) throw();
<del>void operator delete[](void* ptr, const std::nothrow_t&amp;) throw();</del>
</pre>

<p><i>[
The second signature deletion above is editorial.
]</i></p>


<blockquote>
<p><ins>
<i>Requires:</i> If an implementation has strict pointer safety
( [basic.stc.dynamic.safety]) then <code>ptr</code> shall
be a safely-derived pointer.
</ins></p>

<p>-9- ...</p>
</blockquote>

<pre>
void operator delete[](void* ptr, const std::nothrow_t&amp;) throw();
</pre>

<blockquote>
<p><ins>
<i>Requires:</i> If an implementation has strict pointer safety
( [basic.stc.dynamic.safety]) then <code>ptr</code> shall
be a safely-derived pointer.
</ins></p>

<p>-13- ...</p>
</blockquote>

</blockquote>


<p>
Add paragraphs to 17.6.3.4 <a href="https://wg21.link/new.delete.placement">[new.delete.placement]</a>:
</p>

<blockquote><pre>
void operator delete(void* ptr, void*) throw();
</pre>

<blockquote>
<p><ins>
<i>Requires:</i> If an implementation has strict pointer safety
( [basic.stc.dynamic.safety]) then <code>ptr</code> shall
be a safely-derived pointer.
</ins></p>

<p>-7- ...</p>
</blockquote>

<pre>
void operator delete[](void* ptr, void*) throw();
</pre>

<blockquote>
<p><ins>
<i>Requires:</i> If an implementation has strict pointer safety
( [basic.stc.dynamic.safety]) then <code>ptr</code> shall
be a safely-derived pointer.
</ins></p>

<p>-9- ...</p>
</blockquote>

</blockquote>






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