Am 17.11.2013 21:13, schrieb John Cowan: > David A. Wheeler scripsit: > >> Hmm. R7RS has make-parameter, as does SRFI-39. But guile 1.6 has >> neither, and I don't know how widely-available these really are. > The implementation given in R7RS is pretty portable, but should *not* > be used on Schemes with their own implementations, because it may not be > thread safe. Note that R7RS parameters, unlike SRFI 39 ones, are not > mutable (as opposed to rebindable):
I'm not sure that I understand this. (My weak English.) Let's try by example: (define x (make-parameter #f)) Does this: (x #t) count as mutation in this respect or is it the way you do a rebind? /Jörg ------------------------------------------------------------------------------ DreamFactory - Open Source REST & JSON Services for HTML5 & Native Apps OAuth, Users, Roles, SQL, NoSQL, BLOB Storage and External API Access Free app hosting. Or install the open source package on any LAMP server. Sign up and see examples for AngularJS, jQuery, Sencha Touch and Native! http://pubads.g.doubleclick.net/gampad/clk?id=63469471&iu=/4140/ostg.clktrk _______________________________________________ Readable-discuss mailing list Readable-discuss@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/readable-discuss
