| 1 | /*! |
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| 2 | @file |
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| 3 | Defines generally useful preprocessor macros. |
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| 4 | |
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| 5 | Copyright Louis Dionne 2013-2022 |
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| 6 | Distributed under the Boost Software License, Version 1.0. |
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| 7 | (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) |
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| 8 | */ |
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| 9 | |
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| 10 | #ifndef BOOST_HANA_DETAIL_PREPROCESSOR_HPP |
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| 11 | #define BOOST_HANA_DETAIL_PREPROCESSOR_HPP |
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| 12 | |
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| 13 | //! @ingroup group-details |
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| 14 | //! Expands to the concatenation of its two arguments. |
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| 15 | #define BOOST_HANA_PP_CONCAT(x, y) BOOST_HANA_PP_CONCAT_PRIMITIVE(x, y) |
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| 16 | #define BOOST_HANA_PP_CONCAT_PRIMITIVE(x, y) x ## y |
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| 17 | |
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| 18 | //! @ingroup group-details |
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| 19 | //! Expands to the stringized version of its argument. |
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| 20 | #define BOOST_HANA_PP_STRINGIZE(...) BOOST_HANA_PP_STRINGIZE_PRIMITIVE(__VA_ARGS__) |
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| 21 | #define BOOST_HANA_PP_STRINGIZE_PRIMITIVE(...) #__VA_ARGS__ |
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| 22 | |
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| 23 | //! @ingroup group-details |
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| 24 | //! Expands to its first argument. |
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| 25 | #ifdef BOOST_HANA_WORKAROUND_MSVC_PREPROCESSOR_616033 |
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| 26 | #define BOOST_HANA_PP_FRONT(...) BOOST_HANA_PP_FRONT_IMPL_I(__VA_ARGS__) |
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| 27 | #define BOOST_HANA_PP_FRONT_IMPL_I(...) BOOST_HANA_PP_CONCAT(BOOST_HANA_PP_FRONT_IMPL(__VA_ARGS__, ),) |
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| 28 | #else |
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| 29 | #define BOOST_HANA_PP_FRONT(...) BOOST_HANA_PP_FRONT_IMPL(__VA_ARGS__, ) |
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| 30 | #endif |
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| 31 | #define BOOST_HANA_PP_FRONT_IMPL(e0, ...) e0 |
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| 32 | |
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| 33 | //! @ingroup group-details |
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| 34 | //! Expands to all of its arguments, except for the first one. |
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| 35 | //! |
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| 36 | //! This macro may not be called with less than 2 arguments. |
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| 37 | #define BOOST_HANA_PP_DROP_FRONT(e0, ...) __VA_ARGS__ |
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| 38 | |
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| 39 | #endif // !BOOST_HANA_DETAIL_PREPROCESSOR_HPP |
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| 40 | |
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