text: # /* **************************************************************************
  #  *                                                                          *
  #  *     (C) Copyright Edward Diener 2014.
  #  *     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)
  #  *                                                                          *
  #  ************************************************************************** */
  #
  # /* See http://www.boost.org for most recent version. */
  #
  #ifndef BOOST_PREPROCESSOR_DETAIL_IS_BEGIN_PARENS_HPP
  #define BOOST_PREPROCESSOR_DETAIL_IS_BEGIN_PARENS_HPP
  
  #if BOOST_PP_VARIADICS_MSVC
  
  #include <boost/preprocessor/facilities/empty.hpp>
  
  #define BOOST_PP_DETAIL_VD_IBP_CAT(a, b) BOOST_PP_DETAIL_VD_IBP_CAT_I(a, b)
  #define BOOST_PP_DETAIL_VD_IBP_CAT_I(a, b) BOOST_PP_DETAIL_VD_IBP_CAT_II(a ## b)
  #define BOOST_PP_DETAIL_VD_IBP_CAT_II(res) res
  
  #define BOOST_PP_DETAIL_IBP_SPLIT(i, ...) \
      BOOST_PP_DETAIL_VD_IBP_CAT(BOOST_PP_DETAIL_IBP_PRIMITIVE_CAT(BOOST_PP_DETAIL_IBP_SPLIT_,i)(__VA_ARGS__),BOOST_PP_EMPTY()) \
  /**/
  
  #define BOOST_PP_DETAIL_IBP_IS_VARIADIC_C(...) 1 1
  
  #else
  
  #define BOOST_PP_DETAIL_IBP_SPLIT(i, ...) \
      BOOST_PP_DETAIL_IBP_PRIMITIVE_CAT(BOOST_PP_DETAIL_IBP_SPLIT_,i)(__VA_ARGS__) \
  /**/
  
  #define BOOST_PP_DETAIL_IBP_IS_VARIADIC_C(...) 1
  
  #endif /* BOOST_PP_VARIADICS_MSVC */
  
  #define BOOST_PP_DETAIL_IBP_SPLIT_0(a, ...) a
  #define BOOST_PP_DETAIL_IBP_SPLIT_1(a, ...) __VA_ARGS__
  
  #define BOOST_PP_DETAIL_IBP_CAT(a, ...) BOOST_PP_DETAIL_IBP_PRIMITIVE_CAT(a,__VA_ARGS__)
  #define BOOST_PP_DETAIL_IBP_PRIMITIVE_CAT(a, ...) a ## __VA_ARGS__
  
  #define BOOST_PP_DETAIL_IBP_IS_VARIADIC_R_1 1,
  #define BOOST_PP_DETAIL_IBP_IS_VARIADIC_R_BOOST_PP_DETAIL_IBP_IS_VARIADIC_C 0,
  
  #endif /* BOOST_PREPROCESSOR_DETAIL_IS_BEGIN_PARENS_HPP */
  