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boost::xpressive::op::first — first
is a PolymorphicFunctionObject for fetching the first element of a pair.
// In header: <boost/xpressive/regex_actions.hpp> struct first { // member classes/structs/unions template<typename Sig> struct result { }; template<typename This, typename Pair> struct result<> { // types typedef ; }; // public member functions template<typename Pair> () ; };