/Src/Dependencies/Boost/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) && (_MSC_VER >= 1020)
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
20namespace 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