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sequences: implement sum on iota-tuple.

db4
John Benediktsson 2013-05-06 16:02:49 -07:00
parent fe45a08054
commit 71ad332027
2 changed files with 6 additions and 1 deletions
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6
core/sequences/sequences-tests.factor
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@ -283,7 +283,7 @@ unit-test
[ { "d" "a" "b" "c" } ] [ { 3 0 1 2 } { "a" "b" "c" "d" } nths ] unit-test
[ "dac" ] [ { 3 0 2 } "abcd" nths ] unit-test
TUPLE: bogus-hashcode ;
M: bogus-hashcode hashcode* 2drop 0 >bignum ;
@ -316,6 +316,10 @@ M: bogus-hashcode hashcode* 2drop 0 >bignum ;
[ -1 iota ] must-fail
[ T{ iota-tuple { n 10 } } ] [ 10 iota ] unit-test
[ 0 ] [ 10 iota first ] unit-test
{ 0 } [ 0 iota sum ] unit-test
{ 1 } [ 1 iota sum ] unit-test
{ 10 } [ 5 iota sum ] unit-test
{ 15 } [ 6 iota sum ] unit-test
[ "hi" 3 ] [
{ 1 2 3 4 5 6 7 8 } [ H{ { 3 "hi" } } at ] map-find

1
core/sequences/sequences.factor
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@ -1006,6 +1006,7 @@ PRIVATE>
GENERIC: sum ( seq -- n )
M: object sum 0 [ + ] binary-reduce ; inline
M: iota-tuple sum length dup 1 - * 2/ ; inline
: product ( seq -- n ) 1 [ * ] binary-reduce ;