Re: [boost] [future] Early draft of wait for multiple futures interface

From: Johan Torp (johan.torp_at_[hidden])
Date: 2008-05-30 10:49:33

Anthony Williams-4 wrote:
> 
>> is_ready doesn't trigger the callback, so this won't work. 
> 
> That depends on what you mean by "work". 
> 
> It isn't ready, so is_ready() returns false. It just happens to always
> return false until you do something to make it ready.
> 
> If you wait on it, it becomes ready. If you don't wait, it
> doesn't. This is the essential problem with lazy futures.
> 

That is way too strange semantics. A user would not expect having to call
wait() or get() to make a future become ready. I have been thinking about
not type erasing the laziness and instead providing a lazy_future class or
composite future class. But I think inherent, type-erased laziness is a
better idea.

Johan 

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