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Showing content from https://cplusplus.github.io/LWG/issue2000 below:

Missing definition of packaged_task specialization of uses_allocator

This page is a snapshot from the LWG issues list, see the Library Active Issues List for more information and the meaning of C++11 status.

Section: 32.10.10.3 [futures.task.nonmembers] Status: C++11 Submitter: Howard Hinnant Opened: 2010-08-29 Last modified: 2016-01-28

Priority: Not Prioritized

View all issues with C++11 status.

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 {};

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