renamed mask_interrupt to ignore_interrupt;
renamed exhibit_interrupt to raise_interrupt;
(* Title: HOL/LList.thy
ID: $Id$
Author: Lawrence C Paulson, Cambridge University Computer Laboratory
Copyright 1997 University of Cambridge
The "filter" functional for coinductive lists
--defined by a combination of induction and coinduction
*)
LFilter = LList +
consts
findRel :: "('a => bool) => ('a llist * 'a llist)set"
inductive "findRel p"
intrs
found "p x ==> (LCons x l, LCons x l) : findRel p"
seek "[| ~p x; (l,l') : findRel p |] ==> (LCons x l, l') : findRel p"
constdefs
find :: ['a => bool, 'a llist] => 'a llist
"find p l == @l'. (l,l'): findRel p | (l' = LNil & l ~: Domain(findRel p))"
lfilter :: ['a => bool, 'a llist] => 'a llist
"lfilter p l == llist_corec l (%l. case find p l of
LNil => None
| LCons y z => Some(y,z))"
end