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boost::proto::context::null_eval
// In header: <boost/proto/context/null.hpp> template<typename Expr, typename Context> struct null_eval { // types typedef void result_type; // public member functions void operator()(Expr &, Context &) const; };
null_eval public member functionsvoid operator()(Expr & expr, Context & context) const;
                  For N in [0,Expr arity),
                  evaluate:
                  
proto::eval(proto::child_c<N>(expr), context)