[Boost-bugs] [Boost C++ Libraries] #6618: boost::container::flat_map not transparently accepting move-only values

Subject: [Boost-bugs] [Boost C++ Libraries] #6618: boost::container::flat_map not transparently accepting move-only values
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-02-25 23:28:54

#6618: boost::container::flat_map not transparently accepting move-only values
---------------------------------------------------------+------------------
 Reporter:  Charles David Tallman <DaveTallman@…>        |       Owner:  igaztanaga
     Type:  Bugs                                         |      Status:  new       
Milestone:  To Be Determined                             |   Component:  container 
  Version:  Boost 1.48.0                                 |    Severity:  Problem   
 Keywords:  flat_map, moveable not copyable              |  
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 I would have expected to be able to store move-only values in a
 boost::container::flat_map, and to have no code changes except in the
 header files, since it is supposed to be a drop-in replacement for
 std::map. However, I cannot create a key-value pair of a type it will
 accept, because of const errors. The attached program shows the problem.

 Perhaps allowing a non-const std::pair reference to be passed to insert
 would help, or even a new make_pair helper function that returned a
 BOOST_RV_REF(value_type)?

 The same thing happens with boost::container::map.

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Ticket URL: <https://svn.boost.org/trac/boost/ticket/6618>
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