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