El 24/06/16 a les 09:11, Andy Wingo ha escrit: > On Tue 30 Jun 2015 15:50, Josep Portella Florit <j...@primfilat.com> writes: > >> This code crashes Guile 2.0.11: >> >> (define x (make-dynamic-state)) >> (with-dynamic-state x (lambda () (/ 1 0))) > > Related: http://thread.gmane.org/gmane.lisp.guile.devel/16953 > > How are you using dynamic states?
I have code[1] written in Racket which uses what I think are the equivalent to Guile's dynamic states: parameterizations. My code raises exceptions that contain the result of `(current-parameterization)`[2]. It later handles those exceptions and passes the parameterization to `call-with-parameterization`[3] in order to access the value several parameters had before the exception was raised. It also accumulates different results of `(current-parameterization)`, reorders them and for each one it passes the parameterization to `call-with-parameterization` and calls other code[4]. 1: <http://josep-portella.com/en/software/pinaret/> <http://josep-portella.com/software/pinaret/pinaret-0.9.zip> 2: File `pinaret/runtime.rkt`, procedure `raise-error/params`. 3: File `pinaret/system.rkt`, procedure `generate`. File `pinaret/runtime.rkt`, procedure `print-error/params`. 4: File `pinaret/base.rkt`, there are many examples here, look for `(current-parameterization)`.
