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 
operator ()boost::xpressive::grammar_detail::as_matcher::impl35             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
49