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boost::proto::result_of::child_c — A metafunction that returns the type of the Nth
            child of a Proto expression. 
// In header: <boost/proto/traits.hpp>
template<typename Expr, long N> 
struct child_c {
  // types
  typedef typename Expr::proto_child0 value_type;
  typedef see-below                   type;      
};
              A metafunction that returns the type of the Nth
              child of a Proto expression. N must be 0 or less than
              Expr::proto_arity::value.
            
child_c 
        public
       typestypedef typename Expr::proto_child0 value_type;
                The raw type of the Nth child as it is stored
                within Expr. This may be a value or a reference.
              
                If Expr is not a reference type, type
                is computed as follows:
                
                      T const & becomes T
                    
                      T & becomes T
                    
                      T becomes T
                    
                If Expr is a non-const reference type, type
                is computed as follows:
                
                      T const & becomes T const &
                    
                      T & becomes T &
                    
                      T becomes T &
                    
                If Expr is a const reference type, type
                is computed as follows:
                
                      T const & becomes T const &
                    
                      T & becomes T &
                    
                      T becomes T const &