1 #ifndef BOOST_METAPARSE_V1_UTIL_IS_DIGIT_HPP
2 #define BOOST_METAPARSE_V1_UTIL_IS_DIGIT_HPP
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)
9 #include <boost/metaparse/v1/util/in_range_c.hpp>
11 #include <boost/mpl/vector.hpp>
21 template <class C = boost::mpl::na>
22 struct is_digit : in_range_c<char, '0', '9'>::apply<C> {};
25 struct is_digit<boost::mpl::na>
27 typedef is_digit type;
29 template <class C = boost::mpl::na>
30 struct apply : is_digit<C> {};