summaryrefslogtreecommitdiff
path: root/boost/metaparse/v1/if_.hpp
blob: 4c832d8197bb5e97a6fa50508bfdd31807a7f5e0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
#ifndef BOOST_METAPARSE_V1_IF__HPP
#define BOOST_METAPARSE_V1_IF__HPP

// Copyright Abel Sinkovics (abel@sinkovics.hu)  2009 - 2010.
// Distributed under the Boost Software License, Version 1.0.
//    (See accompanying file LICENSE_1_0.txt or copy at
//          http://www.boost.org/LICENSE_1_0.txt)

#include <boost/metaparse/v1/accept.hpp>
#include <boost/metaparse/v1/is_error.hpp>

#include <boost/mpl/if.hpp>

namespace boost
{
  namespace metaparse
  {
    namespace v1
    {
      template <class P, class T, class F>
      struct if_
      {
        typedef if_ type;
        
        template <class S, class Pos>
        struct apply :
          accept<
            typename boost::mpl::if_<
              is_error<typename P::template apply<S, Pos> >,
              F,
              T
            >::type,
            S,
            Pos
          >
        {};
      };
    }
  }
}

#endif