[Boost-bugs] [Boost C++ Libraries] #1623: fusion needs a reverse_fold algorithm

Subject: [Boost-bugs] [Boost C++ Libraries] #1623: fusion needs a reverse_fold algorithm
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2008-02-07 01:57:48

#1623: fusion needs a reverse_fold algorithm
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 Reporter:  eric_niebler             |       Owner:  djowel      
     Type:  Feature Requests         |      Status:  new         
Milestone:  Boost 1.36.0             |   Component:  fusion      
  Version:  Boost Development Trunk  |    Severity:  Optimization
 Keywords:                           |  
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 I can fold a reverse_view, but that's a little awkward, and TMP-heavy.
 That is, it instantiates more templates than are needed. Would be nice if
 Fusion had a reverse_fold algorithm, like MPL.

 This is needed for Proto, which has a reverse_fold transform based in part
 on fusion::fold and reverse_view. I've had to introduce ugly PP
 metaprogramming to avoid calling fusion::fold because of the long compile
 times.

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Ticket URL: <http://svn.boost.org/trac/boost/ticket/1623>
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