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boost::proto::functional::empty — A PolymorphicFunctionObject type that invokes the
            boost::empty() function on its arguments.
// In header: <boost/proto/functional/range/empty.hpp> struct empty : proto::callable { // types typedef bool result_type; // public member functions template<typename Range> bool operator()(Range const &) const; };
              A PolymorphicFunctionObject type that invokes the
              boost::empty() function on its arguments.