cl-unification-devel December 2005

cl-unification-devel@common-lisp.net

3 participants
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[cl-unification-devel] copy-env
by norman werner 04 Dec '05

04 Dec '05

Hello While writing a library with prolog like capabilities on top of cl-unification and a home brewn nondeterministic library I need a way to copy environments. There is a (internal) function copy-env in cl-unification. So I exported it. The problem is that this function returns a new environment which actually still shares objects with its original argument. Is this intentional? If not I propose the following (code will certainly contain bug, because i write it from memory only) (defun copy-env (e) (make-environment :frames (mapcar #'copy-frame (frames e)))) (defun copy-frame (f) (make-frame :bindings (mapcar #'copy-binding (binding f)))) (defun copy-binding (b) (mapcar #'(lambda (cell) (cons (car cell) (cdr cell))) b)) Norman ______________________________________________________________ Verschicken Sie romantische, coole und witzige Bilder per SMS! Jetzt bei WEB.DE FreeMail: http://f.web.de/?mc=021193

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cl-unification-devel December 2005