diff options
Diffstat (limited to 'boost/metaparse/v1/impl/concat.hpp')
-rw-r--r-- | boost/metaparse/v1/impl/concat.hpp | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/boost/metaparse/v1/impl/concat.hpp b/boost/metaparse/v1/impl/concat.hpp new file mode 100644 index 0000000000..d866ae42b1 --- /dev/null +++ b/boost/metaparse/v1/impl/concat.hpp @@ -0,0 +1,106 @@ +#ifndef BOOST_METAPARSE_V1_IMPL_CONCAT_HPP +#define BOOST_METAPARSE_V1_IMPL_CONCAT_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/preprocessor/arithmetic/dec.hpp> +#include <boost/preprocessor/arithmetic/inc.hpp> +#include <boost/preprocessor/arithmetic/mul.hpp> +#include <boost/preprocessor/arithmetic/sub.hpp> +#include <boost/preprocessor/cat.hpp> +#include <boost/preprocessor/punctuation/comma_if.hpp> +#include <boost/preprocessor/repetition/enum.hpp> +#include <boost/preprocessor/repetition/enum_params.hpp> + +namespace boost +{ + namespace metaparse + { + namespace v1 + { + namespace impl + { + template <class A, class B> + struct concat; + +#ifdef BOOST_METAPARSE_VARIADIC_STRING + template <char... As, char... Bs> + struct concat<string<As...>, string<Bs...>> : string<As..., Bs...> {}; +#else + template <class A, class B> + struct concat_impl; + + #ifdef BOOST_METAPARSE_ARG + # error BOOST_METAPARSE_ARG already defined + #endif + #define BOOST_METAPARSE_ARG(z, n, unused) \ + BOOST_PP_CAT(B, BOOST_PP_INC(n)) + + #ifdef BOOST_METAPARSE_CONCAT + # error BOOST_METAPARSE_CONCAT already defined + #endif + #define BOOST_METAPARSE_CONCAT(z, n, unused) \ + template < \ + BOOST_PP_ENUM_PARAMS(n, int A) BOOST_PP_COMMA_IF(n) \ + BOOST_PP_ENUM_PARAMS(BOOST_METAPARSE_LIMIT_STRING_SIZE, int B) \ + > \ + struct \ + concat_impl< \ + string< \ + BOOST_PP_ENUM_PARAMS(n, A) \ + BOOST_PP_COMMA_IF( \ + BOOST_PP_MUL( \ + BOOST_PP_SUB(BOOST_METAPARSE_LIMIT_STRING_SIZE, n), \ + n \ + ) \ + ) \ + BOOST_PP_ENUM( \ + BOOST_PP_SUB(BOOST_METAPARSE_LIMIT_STRING_SIZE, n), \ + BOOST_NO_CHAR BOOST_PP_TUPLE_EAT(3), \ + ~ \ + ) \ + >, \ + string< \ + BOOST_PP_ENUM_PARAMS(BOOST_METAPARSE_LIMIT_STRING_SIZE, B) \ + > \ + > : \ + concat< \ + string<BOOST_PP_ENUM_PARAMS(n, A) BOOST_PP_COMMA_IF(n) B0>, \ + string< \ + BOOST_PP_ENUM( \ + BOOST_PP_DEC(BOOST_METAPARSE_LIMIT_STRING_SIZE), \ + BOOST_METAPARSE_ARG, \ + ~ \ + ) \ + > \ + > \ + {}; + + BOOST_PP_REPEAT( + BOOST_METAPARSE_LIMIT_STRING_SIZE, + BOOST_METAPARSE_CONCAT, + ~ + ) + + #undef BOOST_METAPARSE_ARG + #undef BOOST_METAPARSE_CONCAT + + template <class S> + struct concat<S, string<> > : S {}; + + template <class A, class B> + struct concat : concat_impl<A, B> {}; +#endif + } + } + } +} + +#endif + |