On Wednesday 17 August 2005 16:06, Martin Wille wrote:
Hartmut Kaiser wrote:
Martin Wille wrote:
future<int> f3 = f1 || f2;
We'll probably need more than operator ||.
E.g. consider f1 and f2 implement operations that consume time and may fail, e.g.:
future<whatever> x = query_google_and_check_links_returned || dig_in_local_incomplete_archive;
The local archive is faster than searching something over the internet, but the search may fail. Having an or-operation that waits for the first function to return a *success* would be useful.
Interesting idea! Could we signal that by requesting the function to throw a special exception?
I think that would be viable. Another approach would be to pass a combiner (similar to what Boost.Signals does) and to use optional<whatever> as return types. As I wrote above, I would prefer using optional<T> in this case.
Thorsten