Help needed with compilation error
Abdul Rahman Sattar <[email protected]> Sat, 22 Oct 2016 12:31:24 -0700 (PDT)
| Newsgroups | gmane.comp.lang.scala |
|---|---|
| Message-ID | <[email protected]> |
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Hi,
up vote
down votefavorite
<http://stackoverflow.com/questions/40195799/what-is-wrong-with-the-method-definition#>
Below are my method signatures and definitions in scala
def accumulate[T[_]: Traversable, O: Monoid, A]: (A => O) => T[A] => O =
fao => ta =>
(implicitly[Traversable[T]].traverse[({type f[X] = Acc[O, X]})#f, A, O](ta)(a => Acc(fao(a)))).value
def reduce[T[_]: Traversable, O: Monoid]: T[O] => O = to => accumulate[T, O, O](a => a)(to)
However I get the following error for my definition of reduce
Error:(160, 82) not enough arguments for method accumulate: (implicit evidence$7: Traversable[T], implicit evidence$8: Monoid[O])(O => O) => (T[O] => O).Unspecified value parameter evidence$8.
def reduce[T[_]: Traversable, O: Monoid]: T[O] => O = to => accumulate[T, O, O](a => a)(to)
^
Not sure where I am going wrong. Any help would be appreciated.
Thanks!
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<div dir=3D"ltr">Hi,=C2=A0<div><br></div><div><table style=3D"border-collap=
se: collapse; color: rgb(36, 39, 41); font-family: Arial, "Helvetica N=
eue", Helvetica, sans-serif;"><tbody><tr><td class=3D"votecell" style=
=3D"padding-right: 15px; vertical-align: top;"><div class=3D"vote" style=3D=
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is question shows research effort; it is useful and clear" style=3D"margin-=
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eat: no-repeat; overflow: hidden; display: block; text-indent: -9999em; wid=
th: 40px; height: 30px; background-position: 0px -170px;">up vote</a><span =
itemprop=3D"upvoteCount" class=3D"vote-count-post " style=3D"margin-top: 8p=
x; margin-bottom: 8px; font-size: 20px; display: block; color: rgb(106, 115=
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not show any research effort; it is unclear or not useful" style=3D"margin-=
right: auto; margin-bottom: 10px; margin-left: auto; font-size: 1px; color:=
rgb(0, 119, 204); cursor: pointer; background-image: url("img/sprites=
.svg?v=3D8c1c8cba242e"), none; background-size: initial; background-re=
peat: no-repeat; overflow: hidden; display: block; text-indent: -9999em; wi=
dth: 40px; height: 30px; background-position: 0px -220px;">down vote</a><a =
class=3D"star-off" href=3D"http://stackoverflow.com/questions/40195799/what=
-is-wrong-with-the-method-definition#" title=3D"Click to mark as favorite q=
uestion (click again to undo)" style=3D"margin-right: auto; margin-bottom: =
2px; margin-left: auto; font-size: 1px; color: rgb(0, 119, 204); cursor: po=
inter; background-image: url("img/sprites.svg?v=3D8c1c8cba242e"),=
none; background-size: initial; background-repeat: no-repeat; overflow: hi=
dden; display: block; text-indent: -9999em; width: 40px; height: 30px; back=
ground-position: 0px -120px;">favorite</a><div class=3D"favoritecount"><spa=
n style=3D"color: rgb(106, 115, 124);"></span></div></div></td><td class=3D=
"postcell" style=3D"vertical-align: top;"><div class=3D"post-text" itemprop=
=3D"text" style=3D"margin-bottom: 5px; font-size: 15px; width: 660px; word-=
wrap: break-word; line-height: 1.3;"><p style=3D"margin-bottom: 1em; clear:=
both;">Below are my method signatures and definitions in scala</p><pre cla=
ss=3D"lang-scala prettyprint prettyprinted" style=3D"margin-bottom: 1em; pa=
dding: 5px; font-size: 13px; width: auto; max-height: 600px; overflow: auto=
; font-family: Consolas, Menlo, Monaco, "Lucida Console", "L=
iberation Mono", "DejaVu Sans Mono", "Bitstream Vera Sa=
ns Mono", "Courier New", monospace, sans-serif; background-c=
olor: rgb(239, 240, 241); color: rgb(57, 51, 24); word-wrap: normal;"><code=
style=3D"font-family: Consolas, Menlo, Monaco, "Lucida Console",=
"Liberation Mono", "DejaVu Sans Mono", "Bitstream=
Vera Sans Mono", "Courier New", monospace, sans-serif; whit=
e-space: inherit;"><span class=3D"pln" style=3D"color: rgb(48, 51, 54);"> =
</span><span class=3D"kwd" style=3D"color: rgb(16, 16, 148);">def</span><sp=
an class=3D"pln" style=3D"color: rgb(48, 51, 54);"> accumulate</span><span =
class=3D"pun" style=3D"color: rgb(48, 51, 54);">[</span><span class=3D"pln"=
style=3D"color: rgb(48, 51, 54);">T</span><span class=3D"pun" style=3D"col=
or: rgb(48, 51, 54);">[</span><span class=3D"pln" style=3D"color: rgb(48, 5=
1, 54);">_</span><span class=3D"pun" style=3D"color: rgb(48, 51, 54);">]:</=
span><span class=3D"pln" style=3D"color: rgb(48, 51, 54);"> </span><span cl=
ass=3D"typ" style=3D"color: rgb(43, 145, 175);">Traversable</span><span cla=
ss=3D"pun" style=3D"color: rgb(48, 51, 54);">,</span><span class=3D"pln" st=
yle=3D"color: rgb(48, 51, 54);"> O</span><span class=3D"pun" style=3D"color=
: rgb(48, 51, 54);">:</span><span class=3D"pln" style=3D"color: rgb(48, 51,=
54);"> </span><span class=3D"typ" style=3D"color: rgb(43, 145, 175);">Mono=
id</span><span class=3D"pun" style=3D"color: rgb(48, 51, 54);">,</span><spa=
n class=3D"pln" style=3D"color: rgb(48, 51, 54);"> A</span><span class=3D"p=
un" style=3D"color: rgb(48, 51, 54);">]:</span><span class=3D"pln" style=3D=
"color: rgb(48, 51, 54);"> </span><span class=3D"pun" style=3D"color: rgb(4=
8, 51, 54);">(</span><span class=3D"pln" style=3D"color: rgb(48, 51, 54);">=
A </span><span class=3D"pun" style=3D"color: rgb(48, 51, 54);">=3D></spa=
n><span class=3D"pln" style=3D"color: rgb(48, 51, 54);"> O</span><span clas=
s=3D"pun" style=3D"color: rgb(48, 51, 54);">)</span><span class=3D"pln" sty=
le=3D"color: rgb(48, 51, 54);"> </span><span class=3D"pun" style=3D"color: =
rgb(48, 51, 54);">=3D></span><span class=3D"pln" style=3D"color: rgb(48,=
51, 54);"> T</span><span class=3D"pun" style=3D"color: rgb(48, 51, 54);">[=
</span><span class=3D"pln" style=3D"color: rgb(48, 51, 54);">A</span><span =
class=3D"pun" style=3D"color: rgb(48, 51, 54);">]</span><span class=3D"pln"=
style=3D"color: rgb(48, 51, 54);"> </span><span class=3D"pun" style=3D"col=
or: rgb(48, 51, 54);">=3D></span><span class=3D"pln" style=3D"color: rgb=
(48, 51, 54);"> O </span><span class=3D"pun" style=3D"color: rgb(48, 51, 54=
);">=3D</span><span class=3D"pln" style=3D"color: rgb(48, 51, 54);">
fao </span><span class=3D"pun" style=3D"color: rgb(48, 51, 54);">=3D>=
;</span><span class=3D"pln" style=3D"color: rgb(48, 51, 54);"> ta </span><s=
pan class=3D"pun" style=3D"color: rgb(48, 51, 54);">=3D></span><span cla=
ss=3D"pln" style=3D"color: rgb(48, 51, 54);">
</span><span class=3D"pun" style=3D"color: rgb(48, 51, 54);">(</span>=
<span class=3D"pln" style=3D"color: rgb(48, 51, 54);">implicitly</span><spa=
n class=3D"pun" style=3D"color: rgb(48, 51, 54);">[</span><span class=3D"ty=
p" style=3D"color: rgb(43, 145, 175);">Traversable</span><span class=3D"pun=
" style=3D"color: rgb(48, 51, 54);">[</span><span class=3D"pln" style=3D"co=
lor: rgb(48, 51, 54);">T</span><span class=3D"pun" style=3D"color: rgb(48, =
51, 54);">]].</span><span class=3D"pln" style=3D"color: rgb(48, 51, 54);">t=
raverse</span><span class=3D"pun" style=3D"color: rgb(48, 51, 54);">[({</sp=
an><span class=3D"kwd" style=3D"color: rgb(16, 16, 148);">type</span><span =
class=3D"pln" style=3D"color: rgb(48, 51, 54);"> f</span><span class=3D"pun=
" style=3D"color: rgb(48, 51, 54);">[</span><span class=3D"pln" style=3D"co=
lor: rgb(48, 51, 54);">X</span><span class=3D"pun" style=3D"color: rgb(48, =
51, 54);">]</span><span class=3D"pln" style=3D"color: rgb(48, 51, 54);"> </=
span><span class=3D"pun" style=3D"color: rgb(48, 51, 54);">=3D</span><span =
class=3D"pln" style=3D"color: rgb(48, 51, 54);"> </span><span class=3D"typ"=
style=3D"color: rgb(43, 145, 175);">Acc</span><span class=3D"pun" style=3D=
"color: rgb(48, 51, 54);">[</span><span class=3D"pln" style=3D"color: rgb(4=
8, 51, 54);">O</span><span class=3D"pun" style=3D"color: rgb(48, 51, 54);">=
,</span><span class=3D"pln" style=3D"color: rgb(48, 51, 54);"> X</span><spa=
n class=3D"pun" style=3D"color: rgb(48, 51, 54);">]})#</span><span class=3D=
"pln" style=3D"color: rgb(48, 51, 54);">f</span><span class=3D"pun" style=
=3D"color: rgb(48, 51, 54);">,</span><span class=3D"pln" style=3D"color: rg=
b(48, 51, 54);"> A</span><span class=3D"pun" style=3D"color: rgb(48, 51, 54=
);">,</span><span class=3D"pln" style=3D"color: rgb(48, 51, 54);"> O</span>=
<span class=3D"pun" style=3D"color: rgb(48, 51, 54);">](</span><span class=
=3D"pln" style=3D"color: rgb(48, 51, 54);">ta</span><span class=3D"pun" sty=
le=3D"color: rgb(48, 51, 54);">)(</span><span class=3D"pln" style=3D"color:=
rgb(48, 51, 54);">a </span><span class=3D"pun" style=3D"color: rgb(48, 51,=
54);">=3D></span><span class=3D"pln" style=3D"color: rgb(48, 51, 54);">=
</span><span class=3D"typ" style=3D"color: rgb(43, 145, 175);">Acc</span><=
span class=3D"pun" style=3D"color: rgb(48, 51, 54);">(</span><span class=3D=
"pln" style=3D"color: rgb(48, 51, 54);">fao</span><span class=3D"pun" style=
=3D"color: rgb(48, 51, 54);">(</span><span class=3D"pln" style=3D"color: rg=
b(48, 51, 54);">a</span><span class=3D"pun" style=3D"color: rgb(48, 51, 54)=
;">)))).</span><span class=3D"pln" style=3D"color: rgb(48, 51, 54);">value
</span><span class=3D"kwd" style=3D"color: rgb(16, 16, 148);">def</span><=
span class=3D"pln" style=3D"color: rgb(48, 51, 54);"> reduce</span><span cl=
ass=3D"pun" style=3D"color: rgb(48, 51, 54);">[</span><span class=3D"pln" s=
tyle=3D"color: rgb(48, 51, 54);">T</span><span class=3D"pun" style=3D"color=
: rgb(48, 51, 54);">[</span><span class=3D"pln" style=3D"color: rgb(48, 51,=
54);">_</span><span class=3D"pun" style=3D"color: rgb(48, 51, 54);">]:</sp=
an><span class=3D"pln" style=3D"color: rgb(48, 51, 54);"> </span><span clas=
s=3D"typ" style=3D"color: rgb(43, 145, 175);">Traversable</span><span class=
=3D"pun" style=3D"color: rgb(48, 51, 54);">,</span><span class=3D"pln" styl=
e=3D"color: rgb(48, 51, 54);"> O</span><span class=3D"pun" style=3D"color: =
rgb(48, 51, 54);">:</span><span class=3D"pln" style=3D"color: rgb(48, 51, 5=
4);"> </span><span class=3D"typ" style=3D"color: rgb(43, 145, 175);">Monoid=
</span><span class=3D"pun" style=3D"color: rgb(48, 51, 54);">]:</span><span=
class=3D"pln" style=3D"color: rgb(48, 51, 54);"> T</span><span class=3D"pu=
n" style=3D"color: rgb(48, 51, 54);">[</span><span class=3D"pln" style=3D"c=
olor: rgb(48, 51, 54);">O</span><span class=3D"pun" style=3D"color: rgb(48,=
51, 54);">]</span><span class=3D"pln" style=3D"color: rgb(48, 51, 54);"> <=
/span><span class=3D"pun" style=3D"color: rgb(48, 51, 54);">=3D></span><=
span class=3D"pln" style=3D"color: rgb(48, 51, 54);"> O </span><span class=
=3D"pun" style=3D"color: rgb(48, 51, 54);">=3D</span><span class=3D"pln" st=
yle=3D"color: rgb(48, 51, 54);"> to </span><span class=3D"pun" style=3D"col=
or: rgb(48, 51, 54);">=3D></span><span class=3D"pln" style=3D"color: rgb=
(48, 51, 54);"> accumulate</span><span class=3D"pun" style=3D"color: rgb(48=
, 51, 54);">[</span><span class=3D"pln" style=3D"color: rgb(48, 51, 54);">T=
</span><span class=3D"pun" style=3D"color: rgb(48, 51, 54);">,</span><span =
class=3D"pln" style=3D"color: rgb(48, 51, 54);"> O</span><span class=3D"pun=
" style=3D"color: rgb(48, 51, 54);">,</span><span class=3D"pln" style=3D"co=
lor: rgb(48, 51, 54);"> O</span><span class=3D"pun" style=3D"color: rgb(48,=
51, 54);">](</span><span class=3D"pln" style=3D"color: rgb(48, 51, 54);">a=
</span><span class=3D"pun" style=3D"color: rgb(48, 51, 54);">=3D></span=
><span class=3D"pln" style=3D"color: rgb(48, 51, 54);"> a</span><span class=
=3D"pun" style=3D"color: rgb(48, 51, 54);">)(</span><span class=3D"pln" sty=
le=3D"color: rgb(48, 51, 54);">to</span><span class=3D"pun" style=3D"color:=
rgb(48, 51, 54);">)</span></code></pre><p style=3D"margin-bottom: 1em; cle=
ar: both;">However I get the following error for my definition of reduce</p=
><pre class=3D"lang-scala prettyprint prettyprinted" style=3D"margin-bottom=
: 1em; padding: 5px; font-size: 13px; width: auto; max-height: 600px; overf=
low: auto; font-family: Consolas, Menlo, Monaco, "Lucida Console"=
, "Liberation Mono", "DejaVu Sans Mono", "Bitstrea=
m Vera Sans Mono", "Courier New", monospace, sans-serif; bac=
kground-color: rgb(239, 240, 241); color: rgb(57, 51, 24); word-wrap: norma=
l;"><code style=3D"font-family: Consolas, Menlo, Monaco, "Lucida Conso=
le", "Liberation Mono", "DejaVu Sans Mono", "=
Bitstream Vera Sans Mono", "Courier New", monospace, sans-se=
rif; white-space: inherit;"><span class=3D"typ" style=3D"color: rgb(43, 145=
, 175);">Error</span><span class=3D"pun" style=3D"color: rgb(48, 51, 54);">=
:(</span><span class=3D"lit" style=3D"color: rgb(125, 39, 39);">160</span><=
span class=3D"pun" style=3D"color: rgb(48, 51, 54);">,</span><span class=3D=
"pln" style=3D"color: rgb(48, 51, 54);"> </span><span class=3D"lit" style=
=3D"color: rgb(125, 39, 39);">82</span><span class=3D"pun" style=3D"color: =
rgb(48, 51, 54);">)</span><span class=3D"pln" style=3D"color: rgb(48, 51, 5=
4);"> not enough arguments </span><span class=3D"kwd" style=3D"color: rgb(1=
6, 16, 148);">for</span><span class=3D"pln" style=3D"color: rgb(48, 51, 54)=
;"> method accumulate</span><span class=3D"pun" style=3D"color: rgb(48, 51,=
54);">:</span><span class=3D"pln" style=3D"color: rgb(48, 51, 54);"> </spa=
n><span class=3D"pun" style=3D"color: rgb(48, 51, 54);">(</span><span class=
=3D"kwd" style=3D"color: rgb(16, 16, 148);">implicit</span><span class=3D"p=
ln" style=3D"color: rgb(48, 51, 54);"> evidence$7</span><span class=3D"pun"=
style=3D"color: rgb(48, 51, 54);">:</span><span class=3D"pln" style=3D"col=
or: rgb(48, 51, 54);"> </span><span class=3D"typ" style=3D"color: rgb(43, 1=
45, 175);">Traversable</span><span class=3D"pun" style=3D"color: rgb(48, 51=
, 54);">[</span><span class=3D"pln" style=3D"color: rgb(48, 51, 54);">T</sp=
an><span class=3D"pun" style=3D"color: rgb(48, 51, 54);">],</span><span cla=
ss=3D"pln" style=3D"color: rgb(48, 51, 54);"> </span><span class=3D"kwd" st=
yle=3D"color: rgb(16, 16, 148);">implicit</span><span class=3D"pln" style=
=3D"color: rgb(48, 51, 54);"> evidence$8</span><span class=3D"pun" style=3D=
"color: rgb(48, 51, 54);">:</span><span class=3D"pln" style=3D"color: rgb(4=
8, 51, 54);"> </span><span class=3D"typ" style=3D"color: rgb(43, 145, 175);=
">Monoid</span><span class=3D"pun" style=3D"color: rgb(48, 51, 54);">[</spa=
n><span class=3D"pln" style=3D"color: rgb(48, 51, 54);">O</span><span class=
=3D"pun" style=3D"color: rgb(48, 51, 54);">])(</span><span class=3D"pln" st=
yle=3D"color: rgb(48, 51, 54);">O </span><span class=3D"pun" style=3D"color=
: rgb(48, 51, 54);">=3D></span><span class=3D"pln" style=3D"color: rgb(4=
8, 51, 54);"> O</span><span class=3D"pun" style=3D"color: rgb(48, 51, 54);"=
>)</span><span class=3D"pln" style=3D"color: rgb(48, 51, 54);"> </span><spa=
n class=3D"pun" style=3D"color: rgb(48, 51, 54);">=3D></span><span class=
=3D"pln" style=3D"color: rgb(48, 51, 54);"> </span><span class=3D"pun" styl=
e=3D"color: rgb(48, 51, 54);">(</span><span class=3D"pln" style=3D"color: r=
gb(48, 51, 54);">T</span><span class=3D"pun" style=3D"color: rgb(48, 51, 54=
);">[</span><span class=3D"pln" style=3D"color: rgb(48, 51, 54);">O</span><=
span class=3D"pun" style=3D"color: rgb(48, 51, 54);">]</span><span class=3D=
"pln" style=3D"color: rgb(48, 51, 54);"> </span><span class=3D"pun" style=
=3D"color: rgb(48, 51, 54);">=3D></span><span class=3D"pln" style=3D"col=
or: rgb(48, 51, 54);"> O</span><span class=3D"pun" style=3D"color: rgb(48, =
51, 54);">).</span><span class=3D"pln" style=3D"color: rgb(48, 51, 54);">
</span><span class=3D"typ" style=3D"color: rgb(43, 145, 175);">Unspecified<=
/span><span class=3D"pln" style=3D"color: rgb(48, 51, 54);"> value paramete=
r evidence$8</span><span class=3D"pun" style=3D"color: rgb(48, 51, 54);">.<=
/span><span class=3D"pln" style=3D"color: rgb(48, 51, 54);">
</span><span class=3D"kwd" style=3D"color: rgb(16, 16, 148);">def</span><=
span class=3D"pln" style=3D"color: rgb(48, 51, 54);"> reduce</span><span cl=
ass=3D"pun" style=3D"color: rgb(48, 51, 54);">[</span><span class=3D"pln" s=
tyle=3D"color: rgb(48, 51, 54);">T</span><span class=3D"pun" style=3D"color=
: rgb(48, 51, 54);">[</span><span class=3D"pln" style=3D"color: rgb(48, 51,=
54);">_</span><span class=3D"pun" style=3D"color: rgb(48, 51, 54);">]:</sp=
an><span class=3D"pln" style=3D"color: rgb(48, 51, 54);"> </span><span clas=
s=3D"typ" style=3D"color: rgb(43, 145, 175);">Traversable</span><span class=
=3D"pun" style=3D"color: rgb(48, 51, 54);">,</span><span class=3D"pln" styl=
e=3D"color: rgb(48, 51, 54);"> O</span><span class=3D"pun" style=3D"color: =
rgb(48, 51, 54);">:</span><span class=3D"pln" style=3D"color: rgb(48, 51, 5=
4);"> </span><span class=3D"typ" style=3D"color: rgb(43, 145, 175);">Monoid=
</span><span class=3D"pun" style=3D"color: rgb(48, 51, 54);">]:</span><span=
class=3D"pln" style=3D"color: rgb(48, 51, 54);"> T</span><span class=3D"pu=
n" style=3D"color: rgb(48, 51, 54);">[</span><span class=3D"pln" style=3D"c=
olor: rgb(48, 51, 54);">O</span><span class=3D"pun" style=3D"color: rgb(48,=
51, 54);">]</span><span class=3D"pln" style=3D"color: rgb(48, 51, 54);"> <=
/span><span class=3D"pun" style=3D"color: rgb(48, 51, 54);">=3D></span><=
span class=3D"pln" style=3D"color: rgb(48, 51, 54);"> O </span><span class=
=3D"pun" style=3D"color: rgb(48, 51, 54);">=3D</span><span class=3D"pln" st=
yle=3D"color: rgb(48, 51, 54);"> to </span><span class=3D"pun" style=3D"col=
or: rgb(48, 51, 54);">=3D></span><span class=3D"pln" style=3D"color: rgb=
(48, 51, 54);"> accumulate</span><span class=3D"pun" style=3D"color: rgb(48=
, 51, 54);">[</span><span class=3D"pln" style=3D"color: rgb(48, 51, 54);">T=
</span><span class=3D"pun" style=3D"color: rgb(48, 51, 54);">,</span><span =
class=3D"pln" style=3D"color: rgb(48, 51, 54);"> O</span><span class=3D"pun=
" style=3D"color: rgb(48, 51, 54);">,</span><span class=3D"pln" style=3D"co=
lor: rgb(48, 51, 54);"> O</span><span class=3D"pun" style=3D"color: rgb(48,=
51, 54);">](</span><span class=3D"pln" style=3D"color: rgb(48, 51, 54);">a=
</span><span class=3D"pun" style=3D"color: rgb(48, 51, 54);">=3D></span=
><span class=3D"pln" style=3D"color: rgb(48, 51, 54);"> a</span><span class=
=3D"pun" style=3D"color: rgb(48, 51, 54);">)(</span><span class=3D"pln" sty=
le=3D"color: rgb(48, 51, 54);">to</span><span class=3D"pun" style=3D"color:=
rgb(48, 51, 54);">)</span><span class=3D"pln" style=3D"color: rgb(48, 51, =
54);">
=
</span><span class=3D"pun" style=3D"color: rgb(48, 51, 54);">^</span>=
</code></pre><p style=3D"margin-bottom: 1em; clear: both;">Not sure where I=
am going wrong. Any help would be appreciated.</p><p style=3D"margin-botto=
m: 1em; clear: both;">Thanks!</p></div></td></tr></tbody></table></div></di=
v>
<p></p>
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