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Diffstat (limited to 'boost/metaparse/v1/impl/at_c.hpp')
-rw-r--r-- | boost/metaparse/v1/impl/at_c.hpp | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/boost/metaparse/v1/impl/at_c.hpp b/boost/metaparse/v1/impl/at_c.hpp new file mode 100644 index 0000000000..af7177410e --- /dev/null +++ b/boost/metaparse/v1/impl/at_c.hpp @@ -0,0 +1,66 @@ +#ifndef BOOST_METAPARSE_V1_IMPL_AT_C_HPP +#define BOOST_METAPARSE_V1_IMPL_AT_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/config.hpp> +#include <boost/metaparse/v1/fwd/string.hpp> + +#include <boost/mpl/char.hpp> + +#include <boost/preprocessor/repetition/enum_params.hpp> +#include <boost/preprocessor/repetition/repeat.hpp> + +namespace boost +{ + namespace metaparse + { + namespace v1 + { + namespace impl + { + template <class S, int N> + struct at_c; + +#ifdef BOOST_METAPARSE_VARIADIC_STRING + template <char C, char... Cs, int N> + struct at_c<string<C, Cs...>, N> : at_c<string<Cs...>, N - 1> {}; + + template <char C, char... Cs> + struct at_c<string<C, Cs...>, 0> : boost::mpl::char_<C> {}; +#else + #ifdef BOOST_METAPARSE_STRING_CASE + # error BOOST_METAPARSE_STRING_CASE is already defined + #endif + #define BOOST_METAPARSE_STRING_CASE(z, n, unused) \ + template < \ + BOOST_PP_ENUM_PARAMS(BOOST_METAPARSE_LIMIT_STRING_SIZE, int C) \ + > \ + struct \ + at_c< \ + string< \ + BOOST_PP_ENUM_PARAMS(BOOST_METAPARSE_LIMIT_STRING_SIZE, C) \ + >, \ + n \ + > : \ + boost::mpl::char_<BOOST_PP_CAT(C, n)> \ + {}; + + BOOST_PP_REPEAT( + BOOST_METAPARSE_LIMIT_STRING_SIZE, + BOOST_METAPARSE_STRING_CASE, + ~ + ) + + #undef BOOST_METAPARSE_STRING_CASE +#endif + } + } + } +} + +#endif + |