EQ2EMu/EQ2/source/depends/boost_1_72_0/libs/metaparse/doc/getting_started_19.qbk

[#getting_started_19]

  template <class S, class Item> struct binary_op : eval_binary_op< S, boost::mpl::at_c<Item, 0>::type::value, typename boost::mpl::at_c<Item, 1>::type > {};