#ifndef BOOST_METAPARSE_V1_UTIL_IS_DIGIT_HPP #define BOOST_METAPARSE_V1_UTIL_IS_DIGIT_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/util/in_range_c.hpp> #include <boost/mpl/vector.hpp> namespace boost { namespace metaparse { namespace v1 { namespace util { template <class C = boost::mpl::na> struct is_digit : in_range_c<char, '0', '9'>::apply<C> {}; template <> struct is_digit<boost::mpl::na> { typedef is_digit type; template <class C = boost::mpl::na> struct apply : is_digit<C> {}; }; } } } } #endif