[boost] [future] direct construct from value

From: Frank Mori Hess (frank.hess_at_[hidden])
Date: 2008-05-15 09:15:24

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I've just noticed that neither Anthony's or Braddock's future libraries seem 
to support construction of a future directly from a value, like

future<int> fut_int(5);

Adding such a constructor gives support for implicit conversion of a value of 
type T to a future<T>.  So a function which takes futures as arguments can 
also seamlessly accept values:

future<void> my_func(future<int> f1, future<int> f2);

my_func(fut_int, 3);

This is important for the usability of poet::active_function, which takes all 
parameters as futures.

- -- 
Frank
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