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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - shared_ptr requires allocator to have rebind template"
href="https://bugs.llvm.org/show_bug.cgi?id=41930">41930</a>
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<th>Summary</th>
<td>shared_ptr requires allocator to have rebind template
</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>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>z.zoelec2@gmail.com
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</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
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<p>
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<pre>shared_ptr requires the allocator type in constructor overload 9
(<a href="http://eel.is/c++draft/util.smartptr.shared#const-9">http://eel.is/c++draft/util.smartptr.shared#const-9</a>) to implement a rebind
template. I am not sure if this is a bug because the standard specifies that
the allocator must conform to "Cpp17Allocator", but the standard also
deprecates and removes rebind from std::allocator making it unable to be used
with shared_ptr. Here is an example:
// std::allocator no longer has `rebind` type
struct IntAlloc : std::allocator<int>
{};
{
int* ptr = new int;
std::shared_ptr<int> p(ptr, test_deleter<int>(3), IntAlloc());
}
The above code produces the error:
error: 'rebind' following the 'template' keyword does not refer to a template
typedef typename _Tp::template rebind<_Up>::other type;
^~~~~~</pre>
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