ceph/src/boost/boost/hana/detail/preprocessor.hpp

   1 /*!
   2 @file
   3 Defines generally useful preprocessor macros.
   4
   5 @copyright Louis Dionne 2013-2017
   6 Distributed under the Boost Software License, Version 1.0.
   7 (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
   8  */
   9
  10 #ifndef BOOST_HANA_DETAIL_PREPROCESSOR_HPP
  11 #define BOOST_HANA_DETAIL_PREPROCESSOR_HPP
  12
  13 //! @ingroup group-details
  14 //! Expands to the concatenation of its two arguments.
  15 #define BOOST_HANA_PP_CONCAT(x, y) BOOST_HANA_PP_CONCAT_PRIMITIVE(x, y)
  16 #define BOOST_HANA_PP_CONCAT_PRIMITIVE(x, y) x ## y
  17
  18 //! @ingroup group-details
  19 //! Expands to the stringized version of its argument.
  20 #define BOOST_HANA_PP_STRINGIZE(...) BOOST_HANA_PP_STRINGIZE_PRIMITIVE(__VA_ARGS__)
  21 #define BOOST_HANA_PP_STRINGIZE_PRIMITIVE(...) #__VA_ARGS__
  22
  23 //! @ingroup group-details
  24 //! Expands to its first argument.
  25 #ifdef BOOST_HANA_WORKAROUND_MSVC_PREPROCESSOR_616033
  26 #define BOOST_HANA_PP_FRONT(...) BOOST_HANA_PP_FRONT_IMPL_I(__VA_ARGS__)
  27 #define BOOST_HANA_PP_FRONT_IMPL_I(...) BOOST_HANA_PP_CONCAT(BOOST_HANA_PP_FRONT_IMPL(__VA_ARGS__, ),)
  28 #else
  29 #define BOOST_HANA_PP_FRONT(...) BOOST_HANA_PP_FRONT_IMPL(__VA_ARGS__, )
  30 #endif
  31 #define BOOST_HANA_PP_FRONT_IMPL(e0, ...) e0
  32
  33 //! @ingroup group-details
  34 //! Expands to all of its arguments, except for the first one.
  35 //!
  36 //! This macro may not be called with less than 2 arguments.
  37 #define BOOST_HANA_PP_DROP_FRONT(e0, ...) __VA_ARGS__
  38
  39 #endif // !BOOST_HANA_DETAIL_PREPROCESSOR_HPP