boost/mpl/fold.hpp

   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