[Boost-bugs] [Boost C++ Libraries] #2656: Change boost::tuple::ignore to initialisation rather than assignment to allow pre-compiled headers

Subject: [Boost-bugs] [Boost C++ Libraries] #2656: Change boost::tuple::ignore to initialisation rather than assignment to allow pre-compiled headers
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2009-01-14 11:24:50

#2656: Change boost::tuple::ignore to initialisation rather than assignment to
allow pre-compiled headers
--------------------------------------------------------------------------------+
 Reporter:  Peter Myerscough-Jackopson <peter.myerscough-jackopson_at_[hidden]>  |       Owner:  djowel      
     Type:  Patches                                                             |      Status:  new         
Milestone:  Boost 1.38.0                                                        |   Component:  tuple       
  Version:  Boost 1.37.0                                                        |    Severity:  Optimization
 Keywords:  tuple::ignore                                                       |  
--------------------------------------------------------------------------------+
 In the boost tuple library, there is a variable called ''ignore'' that can
 be used in calls to boost::tie(...). Under C++Builder 2007 it is not
 possible to generate pre-compiled headers when including the appropriate
 headers to use boost::tie because the ''ignore'' variable is assigned on
 construction using the =operator rather than constructed/initialised.
 Although this may be about optimising build performance, and I am using an
 older compiler, I don't think I am requesting a negative change.


 {{{
 --- boost/tuple/detail/tuple_basic.hpp (Revision 46808)
 +++ boost/tuple/detail/tuple_basic.hpp (working copy)
 @@ -665,7 +665,7 @@
 } // namespace detail

 // "ignore" allows tuple positions to be ignored when using "tie".
 ---detail::swallow_assign const ignore = detail::swallow_assign();
 +++detail::swallow_assign const ignore( detail::swallow_assign() );

 //
 ---------------------------------------------------------------------------
 // The call_traits for make_tuple
 }}}

 I hope this is accepted,

 Yours,

 Peter MJ

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/2656>
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