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Add Homogeneous and HomogeneousRowList for homogeneous rows #20

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merged 8 commits into from
Dec 10, 2017
Merged

Add Homogeneous and HomogeneousRowList for homogeneous rows #20

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8b39b00
Add RecordOf and FieldOf for homogeneous records
paulyoung Aug 10, 2017
17d4228
Rename to `Homogenous` and move to `Row` type
paulyoung Aug 24, 2017
0d25ad4
Add comment explaining Homogeneous class
paulyoung Sep 12, 2017
3d51ac4
Add missin fun dep
paulyoung Sep 21, 2017
6d179f8
Add Type.Row.Homogeneous
paulyoung Nov 20, 2017
20fdbe6
Remove unwanted comment
paulyoung Dec 6, 2017
fe087b6
Rename `FieldOf` to `HomogenousRowList`
paulyoung Dec 6, 2017
632538d
Rename instances to coincide previous renaming
paulyoung Dec 6, 2017
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18 changes: 18 additions & 0 deletions src/Type/Data/Record.purs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,18 @@
module Type.Data.Record
( class RecordOf
) where

import Type.Row (class RowToList, Cons, Nil, kind RowList)

class RecordOf record fieldType
instance recordOf
:: ( RowToList record fields
, FieldOf fields fieldType
)
=> RecordOf (Record record) fieldType
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I think (Record record) is the right thing to do here (as opposed to just record) but it has the consequence of changing the type of a function beyond simply adding the type constraint.

For example, this:

foo :: forall a
     . Record a
    -> Record a

becomes:

foo :: forall a
     . RecordOf a Boolean
    => a
    -> a


class FieldOf (rowList :: RowList) fieldType
instance fieldOfCons
:: (FieldOf tail fieldType)
=> FieldOf (Cons symbol fieldType tail) fieldType
instance fieldOfNil :: FieldOf Nil fieldType