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<title>Issue 2416: [fund.ts] std::experimental::any allocator support is unimplementable</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="2416"><a href="lwg-defects.html#2416">2416</a>. [fund.ts] <code>std::experimental::any allocator</code> support is unimplementable</h3>
<p><b>Section:</b> 6.3 <a href="https://cplusplus.github.io/fundamentals-ts/v1.html#any.class">[fund.ts::any.class]</a> <b>Status:</b> <a href="lwg-active.html#Resolved">Resolved</a>
 <b>Submitter:</b> Jonathan Wakely <b>Opened:</b> 2014-06-16 <b>Last modified:</b> 2015-10-26</p>
<p><b>Priority: </b>Not Prioritized
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<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: fund.ts</b></p>
<p>
The allocator-extended copy constructor for <code>any</code> requires an
arbitrary template parameter to be available in a type-erased context
where the dynamic type of the contained object is known. This is not
believed to be possible in C++.
<p/>
If the allocator-extended copy constructor cannot be defined it
questions the usefulness of the other allocator-extended constructors.
</p>

<p><i>[Urbana, 2014-11]</i></p>

<p>
Resolved by paper <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4270">N4270</a>.
</p>



<p id="res-2416"><b>Proposed resolution:</b></p>





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