[PATCH][libstdc++-v3 parallel mode] Enable user-defined swap

[Jonathan Wakely]

On 7 March 2011 20:25, Jonathan Wakely wrote:
>
> 'swap' is a customization point, intended to allow users to provide
> their own versions, found by argument-dependent lookup.

For more details and history of swap as a point of customization, see
http://www.boostpro.com/writing/n1691.html#problem-2-name-reservation
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2001/n1296.asc
and Item 65 in Sutter & Alexandrescu's 'C++ Coding Standards' book