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Diffstat (limited to 'boost/metaparse/v1/impl/nth_of_c.hpp')
-rw-r--r-- | boost/metaparse/v1/impl/nth_of_c.hpp | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/boost/metaparse/v1/impl/nth_of_c.hpp b/boost/metaparse/v1/impl/nth_of_c.hpp new file mode 100644 index 0000000000..d12d164eaa --- /dev/null +++ b/boost/metaparse/v1/impl/nth_of_c.hpp @@ -0,0 +1,61 @@ +#ifndef BOOST_METAPARSE_V1_IMPL_NTH_OF_C_HPP +#define BOOST_METAPARSE_V1_IMPL_NTH_OF_C_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/v1/impl/nth_of_c_impl.hpp> +#include <boost/metaparse/v1/error/index_out_of_range.hpp> +#include <boost/metaparse/v1/fail.hpp> +#include <boost/metaparse/limit_sequence_size.hpp> + +#include <boost/mpl/list.hpp> + +#include <boost/preprocessor/repetition/repeat.hpp> +#include <boost/preprocessor/punctuation/comma_if.hpp> +#include <boost/preprocessor/repetition/enum_params.hpp> +#include <boost/preprocessor/cat.hpp> + +namespace boost +{ + namespace metaparse + { + namespace v1 + { + namespace impl + { + #ifdef BOOST_METAPARSE_NTH_OF_CASE + # error BOOST_METAPARSE_NTH_OF_CASE already defined + #endif + #define BOOST_METAPARSE_NTH_OF_CASE(z, n, unused) \ + template < \ + int K BOOST_PP_COMMA_IF(n) \ + BOOST_PP_ENUM_PARAMS(n, class P) \ + > \ + struct BOOST_PP_CAT(nth_of_c, n) : \ + boost::mpl::if_< \ + boost::mpl::bool_<(0 <= K && K < n)>, \ + nth_of_c_impl< \ + K, \ + boost::mpl::list<BOOST_PP_ENUM_PARAMS(n, P)> \ + >, \ + fail<error::index_out_of_range<0, n - 1, K> > \ + >::type \ + {}; + + BOOST_PP_REPEAT( + BOOST_METAPARSE_LIMIT_SEQUENCE_SIZE, + BOOST_METAPARSE_NTH_OF_CASE, + ~ + ) + + #undef BOOST_METAPARSE_NTH_OF_CASE + } + } + } +} + +#endif + |