107 lines
3.2 KiB
C++
107 lines
3.2 KiB
C++
#ifndef BOOST_METAPARSE_V1_IMPL_CONCAT_HPP
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#define BOOST_METAPARSE_V1_IMPL_CONCAT_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/preprocessor/arithmetic/dec.hpp>
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#include <boost/preprocessor/arithmetic/inc.hpp>
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#include <boost/preprocessor/arithmetic/mul.hpp>
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#include <boost/preprocessor/arithmetic/sub.hpp>
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#include <boost/preprocessor/cat.hpp>
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#include <boost/preprocessor/punctuation/comma_if.hpp>
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#include <boost/preprocessor/repetition/enum.hpp>
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#include <boost/preprocessor/repetition/enum_params.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 A, class B>
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struct concat;
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#ifdef BOOST_METAPARSE_VARIADIC_STRING
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template <char... As, char... Bs>
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struct concat<string<As...>, string<Bs...>> : string<As..., Bs...> {};
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#else
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template <class A, class B>
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struct concat_impl;
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#ifdef BOOST_METAPARSE_ARG
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# error BOOST_METAPARSE_ARG already defined
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#endif
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#define BOOST_METAPARSE_ARG(z, n, unused) \
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BOOST_PP_CAT(B, BOOST_PP_INC(n))
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#ifdef BOOST_METAPARSE_CONCAT
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# error BOOST_METAPARSE_CONCAT already defined
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#endif
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#define BOOST_METAPARSE_CONCAT(z, n, unused) \
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template < \
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BOOST_PP_ENUM_PARAMS(n, int A) BOOST_PP_COMMA_IF(n) \
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BOOST_PP_ENUM_PARAMS(BOOST_METAPARSE_LIMIT_STRING_SIZE, int B) \
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> \
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struct \
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concat_impl< \
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string< \
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BOOST_PP_ENUM_PARAMS(n, A) \
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BOOST_PP_COMMA_IF( \
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BOOST_PP_MUL( \
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BOOST_PP_SUB(BOOST_METAPARSE_LIMIT_STRING_SIZE, n), \
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n \
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) \
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) \
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BOOST_PP_ENUM( \
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BOOST_PP_SUB(BOOST_METAPARSE_LIMIT_STRING_SIZE, n), \
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BOOST_NO_CHAR BOOST_PP_TUPLE_EAT(3), \
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~ \
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) \
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>, \
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string< \
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BOOST_PP_ENUM_PARAMS(BOOST_METAPARSE_LIMIT_STRING_SIZE, B) \
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> \
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> : \
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concat< \
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string<BOOST_PP_ENUM_PARAMS(n, A) BOOST_PP_COMMA_IF(n) B0>, \
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string< \
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BOOST_PP_ENUM( \
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BOOST_PP_DEC(BOOST_METAPARSE_LIMIT_STRING_SIZE), \
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BOOST_METAPARSE_ARG, \
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~ \
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) \
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> \
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> \
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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_CONCAT,
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~
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)
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#undef BOOST_METAPARSE_ARG
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#undef BOOST_METAPARSE_CONCAT
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template <class S>
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struct concat<S, string<> > : S {};
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template <class A, class B>
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struct concat : concat_impl<A, B> {};
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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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