cpp11/impl/at_c.hpp

0001 #ifndef BOOST_METAPARSE_V1_CPP11_IMPL_AT_C_HPP
0002 #define BOOST_METAPARSE_V1_CPP11_IMPL_AT_C_HPP
0003
0004 // Copyright Abel Sinkovics (abel@sinkovics.hu)  2013.
0005 // Distributed under the Boost Software License, Version 1.0.
0006 //    (See accompanying file LICENSE_1_0.txt or copy at
0007 //          http://www.boost.org/LICENSE_1_0.txt)
0008
0009 #include <boost/metaparse/v1/cpp11/fwd/string.hpp>
0010
0011 #include <boost/mpl/char.hpp>
0012
0013 namespace boost
0014 {
0015   namespace metaparse
0016   {
0017     namespace v1
0018     {
0019       namespace impl
0020       {
0021         template <class S, int N>
0022         struct at_c;
0023
0024         template <char C, char... Cs, int N>
0025         struct at_c<string<C, Cs...>, N> : at_c<string<Cs...>, N - 1> {};
0026
0027         template <char C, char... Cs>
0028         struct at_c<string<C, Cs...>, 0> : boost::mpl::char_<C> {};
0029       }
0030     }
0031   }
0032 }
0033
0034 #endif
0035