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- /*!
- @file
- Defines generally useful preprocessor macros.
- @copyright Louis Dionne 2013-2017
- Distributed under the Boost Software License, Version 1.0.
- (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
- */
- #ifndef BOOST_HANA_DETAIL_PREPROCESSOR_HPP
- #define BOOST_HANA_DETAIL_PREPROCESSOR_HPP
- //! @ingroup group-details
- //! Expands to the concatenation of its two arguments.
- #define BOOST_HANA_PP_CONCAT(x, y) BOOST_HANA_PP_CONCAT_PRIMITIVE(x, y)
- #define BOOST_HANA_PP_CONCAT_PRIMITIVE(x, y) x ## y
- //! @ingroup group-details
- //! Expands to the stringized version of its argument.
- #define BOOST_HANA_PP_STRINGIZE(...) BOOST_HANA_PP_STRINGIZE_PRIMITIVE(__VA_ARGS__)
- #define BOOST_HANA_PP_STRINGIZE_PRIMITIVE(...) #__VA_ARGS__
- //! @ingroup group-details
- //! Expands to its first argument.
- #ifdef BOOST_HANA_WORKAROUND_MSVC_PREPROCESSOR_616033
- #define BOOST_HANA_PP_FRONT(...) BOOST_HANA_PP_FRONT_IMPL_I(__VA_ARGS__)
- #define BOOST_HANA_PP_FRONT_IMPL_I(...) BOOST_HANA_PP_CONCAT(BOOST_HANA_PP_FRONT_IMPL(__VA_ARGS__, ),)
- #else
- #define BOOST_HANA_PP_FRONT(...) BOOST_HANA_PP_FRONT_IMPL(__VA_ARGS__, )
- #endif
- #define BOOST_HANA_PP_FRONT_IMPL(e0, ...) e0
- //! @ingroup group-details
- //! Expands to all of its arguments, except for the first one.
- //!
- //! This macro may not be called with less than 2 arguments.
- #define BOOST_HANA_PP_DROP_FRONT(e0, ...) __VA_ARGS__
- #endif // !BOOST_HANA_DETAIL_PREPROCESSOR_HPP
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