Hess, Frank wrote:
To elaborate on Chris's point, the significance of keeping the producer and the consumer interface separate is that it allows future<R> to be made convertible to future<R2> whenever R is convertible to R2 (or R2 is void); this also allows extensions in the spirit of Frank Mori Hess's operator[],
Are you getting me confused with someone else? I don't remember any operator[]?
I needed to go and check the archives; with so much independent development in this area it's easy to make attribution mistakes. My otherwise unreliable memory turned out to be correct in this case; in: http://lists.boost.org/Archives/boost/2007/03/117571.php you say: "You can do things like assign a Future<T> to a Future<U> if T is implicitly converible to U, without blocking. You can also extract elements from future containers and such, like getting a Future<int> from a Future<std::vector<int> > without blocking." Getting a Future<int> from Future< vector<int> > is an application of operator[], although I admit I don't know how it's expressed in your implementation.