Re: [Boost-bugs] [Boost C++ Libraries] #11875: Boost.Phoenix should not forward-declare std::unordered_set / map

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #11875: Boost.Phoenix should not forward-declare std::unordered_set / map
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2016-02-10 21:28:52

#11875: Boost.Phoenix should not forward-declare std::unordered_set / map
-------------------------------------------------+-------------------------
  Reporter:  Jean-Michaël Celerier               |      Owner:  theller
  <jeanmichael.celerier@…>                       |     Status:  new
      Type:  Bugs                                |  Component:  phoenix
 Milestone:  To Be Determined                    |   Severity:  Problem
   Version:  Boost 1.60.0                        |   Keywords:
Resolution:                                      |
-------------------------------------------------+-------------------------
Changes (by Braden McDaniel <braden@…>):

 * cc: braden@… (added)

Comment:

 There are other problems with this, as well, using gcc/libstdc++ (4.9, at
 least). For instance, this template specialization fails to compile if the
 problem Phoenix header gets included:
 {{{#!c++
 template <typename T, typename TypeT, typename KeyT, typename HashT,
 typename KeyEqualT, typename AllocatorT>
 class foo<T, std::unordered_map<KeyT, TypeT, HashT, KeyEqualT, AllocatorT>
 >
 {};
 }}}

 For the time being, I'm simply compiling my code with
 `BOOST_PHOENIX_USING_LIBCPP` defined, as this disables the forward
 declarations. But this is obviously undesirable if that macro ever gets
 used for something that is actually libc++-specific.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/11875#comment:1>
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