19 lines
503 B
Factor
19 lines
503 B
Factor
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! Copyright (C) 2008, 2009 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: accessors models kernel call ;
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IN: models.arrow
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TUPLE: arrow < model model quot ;
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: <arrow> ( model quot -- arrow )
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f arrow new-model
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swap >>quot
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over >>model
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[ add-dependency ] keep ;
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M: arrow model-changed
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[ [ value>> ] [ quot>> ] bi* call( old -- new ) ] [ nip ] 2bi
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set-model ;
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M: arrow model-activated [ model>> ] keep model-changed ;
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