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combinators.smart: add map-reduce-outputs

db4
Slava Pestov 2009-02-12 02:19:41 -06:00
parent dd57fe7a23
commit 13af3b4801
2 changed files with 9 additions and 1 deletions
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4
basis/combinators/smart/smart-tests.factor
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@ -44,4 +44,6 @@ IN: combinators.smart.tests
\ nested-smart-combo-test must-infer
[ { { 1 2 } { 3 4 } } ] [ nested-smart-combo-test ] unit-test
[ { { 1 2 } { 3 4 } } ] [ nested-smart-combo-test ] unit-test
[ 14 ] [ [ 1 2 3 ] [ sq ] [ + ] map-reduce-outputs ] unit-test

6
basis/combinators/smart/smart.factor
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@ -21,6 +21,12 @@ MACRO: reduce-outputs ( quot operation -- newquot )
: sum-outputs ( quot -- n )
[ + ] reduce-outputs ; inline
MACRO: map-reduce-outputs ( quot mapper reducer -- newquot )
[ dup infer out>> ] 2dip
[ swap '[ _ _ napply ] ]
[ [ 1 [-] ] dip n*quot ] bi-curry* bi
'[ @ @ @ ] ;
MACRO: append-outputs-as ( quot exemplar -- newquot )
[ dup infer out>> ] dip '[ @ _ _ nappend-as ] ;