77 lines
2.4 KiB
Factor
77 lines
2.4 KiB
Factor
! :folding=indent:collapseFolds=1:
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! $Id$
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!
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! Copyright (C) 2004 Slava Pestov.
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!
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! Redistribution and use in source and binary forms, with or without
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! modification, are permitted provided that the following conditions are met:
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!
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! 1. Redistributions of source code must retain the above copyright notice,
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! this list of conditions and the following disclaimer.
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!
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! 2. Redistributions in binary form must reproduce the above copyright notice,
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! this list of conditions and the following disclaimer in the documentation
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! and/or other materials provided with the distribution.
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!
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! THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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! INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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! FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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! DEVELOPERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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! SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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! PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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! OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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! WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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! OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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! ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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IN: vectors
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USE: combinators
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USE: kernel
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USE: lists
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USE: math
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USE: stack
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: 2vector-nth ( n vec vec -- obj obj )
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>r over >r vector-nth r> r> vector-nth ;
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: ?vector= ( n vec vec -- ? )
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#! Reached end?
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drop vector-length = ;
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: (vector=) ( n vec vec -- ? )
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3dup ?vector= [
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3drop t ( reached end without any unequal elts )
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] [
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3dup 2vector-nth = [
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>r >r succ r> r> (vector=)
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] [
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3drop f
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] ifte
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] ifte ;
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: vector-length= ( vec vec -- ? )
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vector-length swap vector-length = ;
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: vector= ( obj vec -- ? )
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#! Check if two vectors are equal. Two vectors are
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#! considered equal if they have the same length and contain
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#! equal elements.
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over vector? [
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2dup vector-length= [
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0 -rot (vector=)
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] [
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2drop f
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] ifte
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] [
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2drop f
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] ifte ;
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: ?vector-nth ( n vec -- obj/f )
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2dup vector-length >= [ 2drop f ] [ vector-nth ] ifte ;
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: vector-hashcode ( vec -- n )
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0 swap 4 [
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over ?vector-nth hashcode rot bitxor swap
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] times* drop ;
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