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boost::proto::functional::env_var::result
// In header: <boost/proto/transform/env.hpp>
template<typename Sig> 
struct result {
  // types
  typedef see-below type;
};
                Encodes the return type of proto::functional::env_var::operator().
                The presence of this member template makes proto::functional::env_var
                a valid TR1-style function object type usable with boost::result_of<>.