Re: [Boost-bugs] [Boost C++ Libraries] #9711: future continuation called twice

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #9711: future continuation called twice
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-02-26 09:27:19

#9711: future continuation called twice
---------------------------+----------------------
  Reporter:  anonymous     |      Owner:  viboes
      Type:  Bugs          |     Status:  assigned
 Milestone:  Boost 1.56.0  |  Component:  thread
   Version:  Boost 1.55.0  |   Severity:  Problem
Resolution:                |   Keywords:  futures
---------------------------+----------------------

Comment (by anonymous):

 If you want to start the continuation in the get() of futr2 that would
 mean that this will not start the continuation at all:

 {{{
 auto futr1 = promise1.get_future();

 auto futr2 = futr1.then({});

 promise1.set_value();
 }}}

 Is this intended?
 (Please note that the only get() call here is inside the continuation
 itself.)
 What about this:

 {{{
 auto futr1 = promise1.get_future();

 auto futrLast = futr1.then({}).then({}).then({});

 promise1.set_value();
 }}}

 Do I always have to keep track which future is at the end of the line and
 call its get()?
 My main use-case would be to not block at all, but this way I am forced to
 call get() and thus block in it.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/9711#comment:7>
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