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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Cannot create shared_ptr to const derived from enable_shared_from_this"
href="http://llvm.org/bugs/show_bug.cgi?id=18843">18843</a>
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<th>Summary</th>
<td>Cannot create shared_ptr to const derived from enable_shared_from_this
</td>
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<th>Product</th>
<td>libc++
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>All Bugs
</td>
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<th>Assignee</th>
<td>hhinnant@apple.com
</td>
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<th>Reporter</th>
<td>w.shane.grant@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu, mclow.lists@gmail.com
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Using the latest svn checkout of libc++ with clang 3.3, the following code does
not compile, although it does compile under libstdc++:
--------------
#include <memory>
struct A : std::enable_shared_from_this<A>
{};
int main()
{
std::shared_ptr<A const>( new A() );
};
--------------
It seems that internally this tries to assign a shared_ptr<const A> to a
weak_ptr<A>, which obviously isn't valid, but it seems like very strange
behavior to be unable to create shared_ptr to constant classes derived from
enable_shared_from_this. In libstdc++ they seem to use const_cast to get
around this.</pre>
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