38 lines
1.1 KiB
Factor
38 lines
1.1 KiB
Factor
! Copyright (C) 2005 Slava Pestov.
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! See http://factor.sf.net/license.txt for BSD license.
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IN: kernel-internals
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USING: generic math-internals kernel lists vectors ;
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! An array is a range of memory storing pointers to other
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! objects. Arrays are not used directly, and their access words
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! are not bounds checked. Examples of abstractions built on
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! arrays include vectors, hashtables, and tuples.
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! These words are unsafe. I'd say "do not call them", but that
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! Java-esque. By all means, do use arrays if you need something
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! low-level... but be aware that vectors are usually a better
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! choice.
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BUILTIN: array 8
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: array-capacity ( array -- n ) 1 slot ; inline
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: vector-array ( vec -- array ) >vector 2 slot ; inline
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: set-vector-array ( array vec -- ) >vector 2 set-slot ; inline
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: array-nth ( n array -- obj )
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swap 2 fixnum+ slot ; inline
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: set-array-nth ( obj n array -- )
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swap 2 fixnum+ set-slot ; inline
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: (array>list) ( n i array -- list )
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pick pick fixnum<= [
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3drop [ ]
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] [
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2dup array-nth >r >r 1 fixnum+ r> (array>list) r>
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swap cons
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] ifte ;
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: array>list ( n array -- list )
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0 swap (array>list) ;
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