Re: [Boost-bugs] [Boost C++ Libraries] #2240: Move placeholders into the boost::placeholders namespace

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #2240: Move placeholders into the boost::placeholders namespace
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-12-17 14:58:29

#2240: Move placeholders into the boost::placeholders namespace
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  Reporter:  pdimov                   |       Owner:  pdimov 
      Type:  Tasks                    |      Status:  new    
 Milestone:  To Be Determined         |   Component:  bind   
   Version:  Boost Development Trunk  |    Severity:  Problem
Resolution:                           |    Keywords:         
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Comment (by anonymous):

 +1
 They are actually worse than global, they are in an unnamed namespace, so
 even bringing the std::placeholders to the local workspace doesn't work.
 The only sensible workaround is to overload std::is_placeholder so that it
 works with boost placeholders, then use boost::placeholders everywhere. Do
 you think we could have this overload in boost itself? The following works
 great:
 {{{
 namespace std {

 template<int n> struct is_placeholder<boost::arg<n>> : public
 integral_constant<int,n> {};
 template<int n> struct is_placeholder<const boost::arg<n>> : public
 integral_constant<int,n> {};

 /*namespace std*/ }
  }}}

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/2240#comment:10>
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