diff options
Diffstat (limited to 'boost/metaparse/v1/impl/pop_front.hpp')
-rw-r--r-- | boost/metaparse/v1/impl/pop_front.hpp | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/boost/metaparse/v1/impl/pop_front.hpp b/boost/metaparse/v1/impl/pop_front.hpp new file mode 100644 index 0000000000..ac02d35aa1 --- /dev/null +++ b/boost/metaparse/v1/impl/pop_front.hpp @@ -0,0 +1,62 @@ +#ifndef BOOST_METAPARSE_V1_IMPL_POP_FRONT_HPP +#define BOOST_METAPARSE_V1_IMPL_POP_FRONT_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/repetition/enum_params.hpp> +#include <boost/preprocessor/repetition/repeat_from_to.hpp> + +namespace boost +{ + namespace metaparse + { + namespace v1 + { + namespace impl + { + template <class S> + struct pop_front; + +#ifdef BOOST_METAPARSE_VARIADIC_STRING + template <char C, char... Cs> + struct pop_front<string<C, Cs...>> : string<Cs...> {}; +#else + #ifdef BOOST_METAPARSE_POP_FRONT + # error BOOST_METAPARSE_POP_FRONT already defined + #endif + #define BOOST_METAPARSE_POP_FRONT(z, n, unused) \ + BOOST_PP_COMMA_IF(BOOST_PP_DEC(n)) BOOST_PP_CAT(C, n) + + template < \ + BOOST_PP_ENUM_PARAMS(BOOST_METAPARSE_LIMIT_STRING_SIZE, int C) \ + > + struct + pop_front< + string<BOOST_PP_ENUM_PARAMS(BOOST_METAPARSE_LIMIT_STRING_SIZE, C)> + > : + string< + BOOST_PP_REPEAT_FROM_TO( + 1, + BOOST_METAPARSE_LIMIT_STRING_SIZE, + BOOST_METAPARSE_POP_FRONT, + ~ + ), + BOOST_NO_CHAR + > + {}; + + #undef BOOST_METAPARSE_POP_FRONT +#endif + } + } + } +} + +#endif + |