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boost::proto::unexpr — Lets you inherit the interface of an expression while hiding from Proto the fact that the type is a Proto expression.
// In header: <boost/proto/expr.hpp> template<typename Expr> struct unexpr : Expr { // construct/copy/destruct unexpr(Expr const &); };
            For an expression type E,
            
              proto::is_expr<E>::value
             is true, but
            
              proto::is_expr<proto::unexpr<E> >::value
             is false.