[Bug c++/51617] [C++0x] async(f) isn't.

[dave at boostpro dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51617

--- Comment #1 from Dave Abrahams <dave at boostpro dot com> 2011-12-19 05:11:20 UTC ---
I should add this (non-normative, but still) note from [futures.async]:

[ Note: If this policy is specified together with other policies, such as when
using a policy value of launch::async | launch::deferred, implementations
should defer invocation or the selection of the policy when no more concurrency
can be effectively exploited. — end note ]