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boost::proto::child_c — Return the Nth child of the specified
          Proto expression. 
// In header: <boost/proto/traits.hpp> template<long N, typename Expr> typename proto::result_of::child_c< Expr &, N >::type child_c(Expr & expr); template<long N, typename Expr> typename proto::result_of::child_c< Expr const &, N >::type child_c(Expr const & expr);
            Return the Nth child of the specified Proto
            expression. The child is returned by reference.
          
| Requires: | 
             
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| Returns: | A reference to the  | 
| Throws: | Will not throw. |