Re: [Boost-bugs] [Boost C++ Libraries] #12293: boost::future::then lambda called before future is ready.

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #12293: boost::future::then lambda called before future is ready.
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2016-08-09 00:06:12

#12293: boost::future::then lambda called before future is ready.
----------------------------------+-------------------------
  Reporter:  Jeffrey.Gramowski@…  |      Owner:  viboes
      Type:  Bugs                 |     Status:  assigned
 Milestone:  To Be Determined     |  Component:  thread
   Version:  Boost 1.60.0         |   Severity:  Problem
Resolution:                       |   Keywords:  future then
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Comment (by viboes):

 I believe the problem is due to the fact that the continuation returns a
 future<void>.
 You will need to unwrap the returned future<future<void>>


 {{{
     }).unwrap().then([&value, &tmpValue](boost::future<void> future){

 }}}


 However, I would your code to don't compile as the continuation should had
 a boost::future<future<void>>.

 When I change the continuation as follows I get the expected error.


 {{{
     }).then([&value, &tmpValue](boost::future<void>& future){

 }}}


 Note the that the future is passed by reference.

 This mean that the call to the continuation is getting the embedded
 future. I will check this.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/12293#comment:7>
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