Re: [Boost-users] future<>.then and promises

Le 28/06/13 20:39, Klaim - Joël Lamotte a écrit :

On Fri, Jun 28, 2013 at 7:48 PM, Vicente J. Botet Escriba mailto:vicente.botet@wanadoo.fr> wrote:

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. "

Ah yes, ok, so it will be called at least when future.get() will be called, if I understood correctly?

Yes.

...

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.

I thought the original standard proposition was moving the future into the callback, or is this point under discussion?

You are right. I will fix this soon. best, Vicente