> On Jan 29, 2016, at 5:12 PM, Jean-Michel HUFFLEN <[email protected]> wrote: > > Jens Axel Søgaard <[email protected]> wrote: > >> In R6RS '(left top) will allocate a list consisting of mutable cons cells. >> In Racket '(left top) will allocate a list of immutable cons cells. > > OK, thanks. But a point is still obscure, for me. In R6RS, if the library > "mutable-pairs" is not used, lists are supposed to be immutable, aren't they? > So, they are immutable because we cannot use "set-car!" and "set-cdr!", > provided by this library, but they are not "immuable enough" for Racket's > graphical objects... Strange...
If set-car! and set-cdr! aren't required, that only means that that module can't mutate them. But if that list is passed into a function from another module, that function could mutate them, so they aren't immutable. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
