When I fix it, the continuation would not be called immediately but as the doc states it should

"- If the parent was created with promise<< or with a packaged_task<> (has no associated launch policy), the continuation behaves the same as the third overload with a policy argument of launch::async | launch::deferred and the same argument for func.
"

1.

   ft.then( []( future<T> f ) { return 42; } ); 

This will not compile (VS2012U3) because there is an attempt to copy future<T> (which looks like a bug I reported where returning a future would

trigger copy instead of moving the future, bug fixed since then so I'm a bit surprise about this one)

Currently the prototype of a continuation takes a future by reference, but I could change it to by value (which need to move the future.