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boost::proto::functional::first —
A PolymorphicFunctionObject type that returns
the first element of a std::pair<>
.
// In header: <boost/proto/functional/std/utility.hpp> struct first : proto::callable { // member classes/structs/unions template<typename This, typename Pair> struct result<> { // types typedef ; }; template<typename This, typename Pair> struct result<> { // types typedef ; }; template<typename This, typename Pair> struct result<> { // types typedef ; }; // public member functions template<typename Pair> () ; template<typename Pair> () ; };