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### Header <boost/xpressive/regex_traits.hpp>

Includes the C regex traits or the CPP regex traits header file depending on the BOOST_XPRESSIVE_USE_C_TRAITS macro.

    namespace boost {
      namespace xpressive {
        struct regex_traits_version_1_tag;
        struct regex_traits_version_2_tag;
        template<typename Traits> struct has_fold_case;
        template<typename Char, typename Impl> struct regex_traits;
      }
    }