only returns `1`. It is possible to duplicate the behavior of `let/cc` using `reset`/`shift`, but you have to structure your code in certain ways to do it. In order to duplicate the behavior of `reset`/`shift` using `let/cc`, you need to also make use of a mutable reference cell. So in that sense delimited continuations are more powerful and undelimited continuations are sort-of a special case.
(In the OCaml code above for using delimited continuations, there is a mutable reference cell `reset_label`, but this is just for convenience. Oleg's library is designed for use with _multiple_ reset blocks having different labels, then when you invoke `shift` you have to specify which labeled reset block you want to potentially skip the rest of. We haven't introduced that complexity into our discussion, so for convenience we worked around it in showing you how to use `reset` and `shift` in OCaml. And the mutable reference cell was only playing the role of enabling us to work around the need to explicitly specify the `reset` block's label.)
only returns `1`. It is possible to duplicate the behavior of `let/cc` using `reset`/`shift`, but you have to structure your code in certain ways to do it. In order to duplicate the behavior of `reset`/`shift` using `let/cc`, you need to also make use of a mutable reference cell. So in that sense delimited continuations are more powerful and undelimited continuations are sort-of a special case.
(In the OCaml code above for using delimited continuations, there is a mutable reference cell `reset_label`, but this is just for convenience. Oleg's library is designed for use with _multiple_ reset blocks having different labels, then when you invoke `shift` you have to specify which labeled reset block you want to potentially skip the rest of. We haven't introduced that complexity into our discussion, so for convenience we worked around it in showing you how to use `reset` and `shift` in OCaml. And the mutable reference cell was only playing the role of enabling us to work around the need to explicitly specify the `reset` block's label.)