67 lines
1.7 KiB
C++
67 lines
1.7 KiB
C++
#ifndef BOOST_METAPARSE_V1_IMPL_AT_C_HPP
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#define BOOST_METAPARSE_V1_IMPL_AT_C_HPP
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// Copyright Abel Sinkovics (abel@sinkovics.hu) 2013.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#include <boost/metaparse/config.hpp>
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#include <boost/metaparse/v1/fwd/string.hpp>
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#include <boost/mpl/char.hpp>
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#include <boost/preprocessor/repetition/enum_params.hpp>
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#include <boost/preprocessor/repetition/repeat.hpp>
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namespace boost
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{
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namespace metaparse
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{
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namespace v1
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{
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namespace impl
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{
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template <class S, int N>
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struct at_c;
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#ifdef BOOST_METAPARSE_VARIADIC_STRING
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template <char C, char... Cs, int N>
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struct at_c<string<C, Cs...>, N> : at_c<string<Cs...>, N - 1> {};
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template <char C, char... Cs>
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struct at_c<string<C, Cs...>, 0> : boost::mpl::char_<C> {};
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#else
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#ifdef BOOST_METAPARSE_STRING_CASE
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# error BOOST_METAPARSE_STRING_CASE is already defined
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#endif
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#define BOOST_METAPARSE_STRING_CASE(z, n, unused) \
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template < \
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BOOST_PP_ENUM_PARAMS(BOOST_METAPARSE_LIMIT_STRING_SIZE, int C) \
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> \
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struct \
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at_c< \
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string< \
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BOOST_PP_ENUM_PARAMS(BOOST_METAPARSE_LIMIT_STRING_SIZE, C) \
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>, \
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n \
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> : \
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boost::mpl::char_<BOOST_PP_CAT(C, n)> \
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{};
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BOOST_PP_REPEAT(
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BOOST_METAPARSE_LIMIT_STRING_SIZE,
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BOOST_METAPARSE_STRING_CASE,
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~
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)
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#undef BOOST_METAPARSE_STRING_CASE
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#endif
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}
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}
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}
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}
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#endif
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