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      1 
      2 #ifndef BOOST_MPL_FOLD_HPP_INCLUDED
      3 #define BOOST_MPL_FOLD_HPP_INCLUDED
      4 
      5 // Copyright Aleksey Gurtovoy 2001-2004
      6 // Copyright David Abrahams 2001-2002
      7 //
      8 // Distributed under the Boost Software License, Version 1.0.
      9 // (See accompanying file LICENSE_1_0.txt or copy at
     10 // http://www.boost.org/LICENSE_1_0.txt)
     11 //
     12 // See http://www.boost.org/libs/mpl for documentation.
     13 
     14 // $Id: fold.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
     15 // $Date: 2008-10-10 23:19:02 -0700 (Fri, 10 Oct 2008) $
     16 // $Revision: 49267 $
     17 
     18 #include <boost/mpl/begin_end.hpp>
     19 #include <boost/mpl/O1_size.hpp>
     20 #include <boost/mpl/aux_/fold_impl.hpp>
     21 #include <boost/mpl/aux_/na_spec.hpp>
     22 #include <boost/mpl/aux_/lambda_support.hpp>
     23 
     24 namespace boost { namespace mpl {
     25 
     26 template<
     27       typename BOOST_MPL_AUX_NA_PARAM(Sequence)
     28     , typename BOOST_MPL_AUX_NA_PARAM(State)
     29     , typename BOOST_MPL_AUX_NA_PARAM(ForwardOp)
     30     >
     31 struct fold
     32 {
     33     typedef typename aux::fold_impl<
     34           ::boost::mpl::O1_size<Sequence>::value
     35         , typename begin<Sequence>::type
     36         , typename end<Sequence>::type
     37         , State
     38         , ForwardOp
     39         >::state type;
     40 
     41     BOOST_MPL_AUX_LAMBDA_SUPPORT(3,fold,(Sequence,State,ForwardOp))
     42 };
     43 
     44 BOOST_MPL_AUX_NA_SPEC(3, fold)
     45 
     46 }}
     47 
     48 #endif // BOOST_MPL_FOLD_HPP_INCLUDED
     49