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### 2000. Missing definition of `packaged_task` specialization of `uses_allocator`

Section: 33.10.10.3 [futures.task.nonmembers] Status: C++11 Submitter: Howard Hinnant Opened: 2010-08-29 Last modified: 2016-01-28

Priority: Not Prioritized

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Discussion:

[futures.task.nonmembers]/3 says:

>        template <class R, class Alloc>
>          struct uses_allocator<packaged_task<R>, Alloc>;

This is a declaration, but should be a definition.

Proposed resolution:

Change [futures.task.nonmembers]/3:

>        template <class R, class Alloc>
>          struct uses_allocator<packaged_task<R>, Alloc>;
>             : true_type {};