#ifndef BOOST_METAPARSE_V1_FAIL_AT_FIRST_CHAR_EXPECTED_HPP #define BOOST_METAPARSE_V1_FAIL_AT_FIRST_CHAR_EXPECTED_HPP // Copyright Abel Sinkovics (abel@sinkovics.hu) 2015. // 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/impl/void_.hpp> #include <boost/metaparse/v1/accept.hpp> #include <boost/metaparse/v1/reject.hpp> #include <boost/metaparse/v1/is_error.hpp> #include <boost/metaparse/v1/get_position.hpp> #include <boost/metaparse/v1/error/expected_to_fail.hpp> #include <boost/mpl/eval_if.hpp> #include <boost/mpl/equal_to.hpp> namespace boost { namespace metaparse { namespace v1 { template <class P> struct fail_at_first_char_expected { private: template <class S, class Pos> struct apply_err : boost::mpl::eval_if< typename boost::mpl::equal_to< Pos, typename get_position<typename P::template apply<S, Pos> >::type >::type, accept<impl::void_, S, Pos>, typename P::template apply<S, Pos> > {}; public: typedef fail_at_first_char_expected type; template <class S, class Pos> struct apply : boost::mpl::eval_if< typename is_error<typename P::template apply<S, Pos> >::type, apply_err<S, Pos>, reject<error::expected_to_fail, Pos> > {}; }; } } } #endif