! :folding=indent:collapseFolds=1:

! $Id$
!
! Copyright (C) 2004 Slava Pestov.
! 
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! modification, are permitted provided that the following conditions are met:
! 
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!    this list of conditions and the following disclaimer.
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IN: stack
USE: vectors

: 2drop ( x x -- ) drop drop ;
: 3drop ( x x x -- ) drop drop drop ;
: 2dup ( x y -- x y x y ) over over ;
: 3dup ( x y z -- x y z x y z ) pick pick pick ;
: 2swap ( x y z t -- z t x y ) rot >r rot r> ;
: -rot ( x y z -- z x y ) rot rot ;
: dupd ( x y -- x x y ) >r dup r> ;
: swapd ( x y z -- y x z ) >r swap r> ;
: transp ( x y z -- z y x ) swap rot ;

: clear ( -- )
    #! Clear the datastack. For interactive use only; invoking
    #! this from a word definition will clobber any values left
    #! on the data stack by the caller.
    0 <vector> set-datastack ;