ceph/src/boost/libs/xpressive/include/boost/xpressive/detail/static/transforms/as_matcher.hpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // as_matcher.hpp
   3 //
   4 //  Copyright 2008 Eric Niebler. Distributed under the Boost
   5 //  Software License, Version 1.0. (See accompanying file
   6 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   7
   8 #ifndef BOOST_XPRESSIVE_DETAIL_STATIC_TRANSFORMS_AS_MATCHER_HPP_EAN_04_01_2007
   9 #define BOOST_XPRESSIVE_DETAIL_STATIC_TRANSFORMS_AS_MATCHER_HPP_EAN_04_01_2007
  10
  11 // MS compatible compilers support #pragma once
  12 #if defined(_MSC_VER)
  13 # pragma once
  14 #endif
  15
  16 #include <boost/mpl/assert.hpp>
  17 #include <boost/xpressive/detail/detail_fwd.hpp>
  18 #include <boost/xpressive/detail/static/static.hpp>
  19
  20 namespace boost { namespace xpressive { namespace grammar_detail
  21 {
  22     struct as_matcher : proto::transform<as_matcher>
  23     {
  24         template<typename Expr, typename State, typename Data>
  25         struct impl : proto::transform_impl<Expr, State, Data>
  26         {
  27             typedef typename impl::data data_type;
  28
  29             typedef
  30                 typename data_type::template apply<
  31                     typename proto::result_of::value<typename impl::expr>::type
  32                 >::type
  33             result_type;
  34
  35             result_type operator ()(
  36                 typename impl::expr_param expr
  37               , typename impl::state_param
  38               , typename impl::data_param data
  39             ) const
  40             {
  41                 return data.call(proto::value(expr));
  42             }
  43         };
  44     };
  45
  46 }}}
  47
  48 #endif