Re: Sql.FutureResult, an Sql.Connection Concurrent.Promise interface

Stephen R. van den Berg wrote:

On second thought, the better interface probably would be:

Concurrent.Promise p = Concurrent.Promise(); Concurrent.Future f;

f = p->depend( future1 ); f = f->depend( future2 ); f->on_success(...);

Wouldn't it?

I don't see what that gives you.

Also I would like to make this possible:

void depend(Future f); variant Future depend();

That allows you to very easily synchronize across multiple call back based APIs.

Promise p = Promise(); call_out(666, lambda(Future f) { f->success(1); }, p->depend()); call_out(123, lambda(Future f) { f->success(1); }, p->depend()); call_out(42, lambda(Future f) { f->success(1); }, p->depend()); p->on_success(...);