Re: [Boost-bugs] [Boost C++ Libraries] #1403: Enable copying boost::array to const

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #1403: Enable copying boost::array to const
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2007-11-09 03:40:33

#1403: Enable copying boost::array to const
---------------------------------+------------------------------------------
  Reporter:  pop.atry_at_[hidden]  |       Owner:         
      Type:  Feature Requests    |      Status:  new    
 Milestone:  To Be Determined    |   Component:  None   
   Version:  Boost 1.34.1        |    Severity:  Problem
Resolution:                      |    Keywords:         
---------------------------------+------------------------------------------
Comment (by steven_watanabe):

 The only easy way I can see of implementing this feature
 is to add a constructor.  This breaks aggregate-ness.

 There is one other way to do it, which I would rather not contemplate.

 {{{

 template<class Dest, class T>
 Dest array_cast(const boost::array<T, 0>&) {
     Dest result = {};
     return(result);
 }

 template<class Dest, class T>
 Dest array_cast(const boost::array<T, 1>& from) {
     Dest result = {from[0]};
     return(result);
 }

 template<class Dest, class T>
 Dest array_cast(const boost::array<T, 2>& from) {
     Dest result = {from[0], from[1]};
     return(result);
 }

 // and so on

 }}}

-- 
Ticket URL: <http://svn.boost.org/trac/boost/ticket/1403#comment:2>
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