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### 1300. Circular definition of `promise::swap`

Section: 33.10.6 [futures.promise] Status: Resolved Submitter: Jonathan Wakely Opened: 2009-12-26 Last modified: 2016-01-28

Priority: Not Prioritized

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Discussion:

33.10.6 [futures.promise]/12 defines the effects of `promise::swap(promise&)` as

>     void swap(promise& other);

> > 12 Effects: `swap(*this, other)`

and 33.10.6 [futures.promise]/25 defines `swap(promise<R&>, promise<R>&)` as

>     template <class R>
>       void swap(promise<R>& x, promise<R>& y);

> > 25 Effects: `x.swap(y)`.

[ 2010-01-13 Daniel added "Throws: Nothing." ]

[ 2010-01-14 Moved to Tentatively Ready after 5 positive votes on c++std-lib. ]

[ 2010 Pittsburgh: ]

> Moved to NAD Editorial Resolved. Rationale added below.

Rationale:

Solved by N3058.

Proposed resolution:

Change 33.10.6 [futures.promise] paragraph 12

>     void swap(promise& other);

> > 12 Effects: `swap(*this, other)` Exchanges the associated states of `*this` and `other`.

> > 13 ...

> > Throws: Nothing.