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32 lines
734 B
Plaintext
32 lines
734 B
Plaintext
# (C) Copyright David Abrahams 2001. Permission to copy, use, modify, sell and
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# distribute this software is granted provided this copyright notice appears in
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# all copies. This software is provided "as is" without express or implied
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# warranty, and with no claim as to its suitability for any purpose.
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# difference
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# returns the elements of B that are not in A
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rule difference ( B * : A * )
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{
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local result = ;
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local element ;
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for element in $(B)
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{
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if ! ( $(element) in $(A) )
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{
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result += $(element) ;
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}
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}
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return $(result) ;
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}
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rule __test__ ( )
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{
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import assert ;
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assert.result 0 1 4 6 8 9
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: difference 0 1 2 3 4 5 6 7 8 9 : 2 3 5 7 ;
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}
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