[Bug libstdc++/57440] Memory usage with future and std containers

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57440

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to DrD from comment #0)
>         // ... launch the threads
>         vector<std::future<double> > values;
>         for (uint w=0; w<nThreads; ++w) {
>             values.push_back(std::async(TestFutures));
>         }

One quick comment, without analysing the issue:

No threads are launched in your program.  Currently GCC's std::async always
behaves as std::async(std::launch::deferred, ...) so to run in a new thread you
need to explicitly call std::async(std::launch::async, TestFutures)