ceph/src/boost/boost/metaparse/v1/if_.hpp

   1 #ifndef BOOST_METAPARSE_V1_IF__HPP
   2 #define BOOST_METAPARSE_V1_IF__HPP
   3
   4 // Copyright Abel Sinkovics (abel@sinkovics.hu)  2009 - 2010.
   5 // Distributed under the Boost Software License, Version 1.0.
   6 //    (See accompanying file LICENSE_1_0.txt or copy at
   7 //          http://www.boost.org/LICENSE_1_0.txt)
   8
   9 #include <boost/metaparse/v1/accept.hpp>
  10 #include <boost/metaparse/v1/is_error.hpp>
  11
  12 #include <boost/mpl/if.hpp>
  13
  14 namespace boost
  15 {
  16   namespace metaparse
  17   {
  18     namespace v1
  19     {
  20       template <class P, class T, class F>
  21       struct if_
  22       {
  23         typedef if_ type;
  24
  25         template <class S, class Pos>
  26         struct apply :
  27           accept<
  28             typename boost::mpl::if_<
  29               is_error<typename P::template apply<S, Pos> >,
  30               F,
  31               T
  32             >::type,
  33             S,
  34             Pos
  35           >
  36         {};
  37       };
  38     }
  39   }
  40 }
  41
  42 #endif
  43