Re: [boost] [futures] Request for Comments

From: Martin Wille (mw8329_at_[hidden])
Date: 2005-08-17 09:06:42

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.

Regards,
m
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