src/CCL/ex/Stream.thy
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     1 (*  Title: 	CCL/ex/stream.thy
       
     2     ID:         $Id$
       
     3     Author: 	Martin Coen, Cambridge University Computer Laboratory
       
     4     Copyright   1993  University of Cambridge
       
     5 
       
     6 Programs defined over streams.
       
     7 *)
       
     8 
       
     9 Stream = List + 
       
    10 
       
    11 consts
       
    12 
       
    13   iter1,iter2   ::  "[i=>i,i]=>i"
       
    14 
       
    15 rules 
       
    16 
       
    17   iter1_def   "iter1(f,a) == letrec iter x be x.iter(f(x)) in iter(a)"
       
    18   iter2_def   "iter2(f,a) == letrec iter x be x.map(f,iter(x)) in iter(a)"
       
    19 
       
    20 end