#ifndef BOOST_METAPARSE_V1_CPP98_IMPL_IS_NONE_HPP #define BOOST_METAPARSE_V1_CPP98_IMPL_IS_NONE_HPP // Copyright Abel Sinkovics (abel@sinkovics.hu) 2013. // 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/limit_one_char_except_size.hpp> #include <boost/mpl/eval_if.hpp> #include <boost/mpl/bool.hpp> #include <boost/preprocessor/cat.hpp> #include <boost/preprocessor/arithmetic/dec.hpp> #include <boost/preprocessor/repetition/enum_params.hpp> #include <boost/preprocessor/repetition/repeat_from_to.hpp> namespace boost { namespace metaparse { namespace v1 { namespace impl { template <class Stub = int> struct is_none0 { template <class C> struct apply : boost::mpl::true_ {}; }; #ifdef BOOST_METAPARSE_DEFINE_IS_NONE # error BOOST_METAPARSE_DEFINE_IS_NONE already defined #endif #define BOOST_METAPARSE_DEFINE_IS_NONE(z, n, unused) \ template <BOOST_PP_ENUM_PARAMS(n, class T)> \ struct BOOST_PP_CAT(is_none, n) \ { \ template <class C> \ struct apply : \ boost::mpl::eval_if< \ boost::mpl::bool_< \ C::type::value \ == BOOST_PP_CAT(T, BOOST_PP_DEC(n))::type::value \ >, \ boost::mpl::false_, \ typename BOOST_PP_CAT(is_none, BOOST_PP_DEC(n))< \ BOOST_PP_ENUM_PARAMS(BOOST_PP_DEC(n), T) \ >::template apply<C> \ > \ {}; \ }; BOOST_PP_REPEAT_FROM_TO( 1, BOOST_METAPARSE_LIMIT_ONE_CHAR_EXCEPT_SIZE, BOOST_METAPARSE_DEFINE_IS_NONE, ~ ) #undef BOOST_METAPARSE_DEFINE_IS_NONE } } } } #endif