Proposed resolution:

1. In [futures.task], immediately after the definition of class template packaged_task add:

   
   template<class R, class... Argtypes>
   void swap(packaged_task<R(ArgTypes...)>&, packaged_task<R(ArgTypes...)>&);
   
   

2. At the end of [futures.task] (after p. 20), add the following prototype description:

   
   template<class R, class... Argtypes>
   void swap(packaged_task<R(ArgTypes...)>& x, packaged_task<R(ArgTypes...)>& y);
   

   Effects: x.swap(y)

   Throws: Nothing.

Rationale:

Solved by N3058.

[ 2010 Pittsburgh: ]

Moved to NAD EditorialResolved. Rationale added below.

[ 2009-10 post-Santa Cruz: ]

Move to Tentatively Ready, removing bullet 3 from the proposed resolution but keeping the other two bullets.

[ 2009-05-24 Daniel removed part 2 of the proposed resolution. ]

[ Batavia (2009-05): ]

Alisdair notes that paragraph 2 of the proposed resolution has already been applied in the current Working Draft.

We note a pending future-related paper by Detlef; we would like to wait for this paper before proceeding.

Move to Open.

Class template packaged_task in [futures.task] shows a member swap declaration, but misses to document it's effects (No prototype provided). Further on this class misses to provide a non-member swap.