factor/library/vectors.factor

! :folding=indent:collapseFolds=1:

! $Id$
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! Copyright (C) 2004 Slava Pestov.
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IN: vectors
USE: arithmetic
USE: kernel
USE: stack

: vector-empty? ( obj -- ? )
    vector-length 0 = ;

: vector-clear ( vector -- list )
    #! Clears a vector.
    0 swap set-vector-length ;

: vector-push ( obj vector -- )
    #! Push a value on the end of a vector.
    dup vector-length swap set-vector-nth ;

: vector-peek ( vector -- obj )
    #! Get value at end of vector without removing it.
    dup vector-length pred swap vector-nth ;

: vector-pop ( vector -- obj )
    #! Get value at end of vector and remove it.
    dup vector-length pred ( vector top )
    2dup swap vector-nth >r swap set-vector-length r> ;

: >pop> ( stack -- stack )
    dup vector-pop drop ;

DEFER: vector-map

: clone-vector ( vector -- vector )
    #! Shallow copy of a vector.
    [ ] vector-map ;