Kishimen

genericSumToVariant :: forall r rep a. Generic a rep => GenericSumToVariant rep r => a -> Variant r

Convert a generic sum into a variant

variantToGenericSum :: forall r rep a. Generic a rep => GenericSumToVariant rep r => Variant r -> a

Convert a variant into a generic sum, where the type of the sum determines the type of the variant, because you could not construct the sum otherwise. This also means that we can recover from the alternative introduced when expanding and contracting the Variant rows.

class GenericSumToVariant rep (r :: Row Type) | rep -> r where

Give Generic Sum Rep, get Variant

Members

• genericSumToVariantImpl :: rep -> Variant r
• variantImplToGenericSumImpl :: Variant r -> Maybe rep

Instances

• (IsSymbol name, Cons name ty () r, GenericSumToVariantArg a ty) => GenericSumToVariant (Constructor name a) r
• (GenericSumToVariant a ra, GenericSumToVariant b rb, Union ra ra' r, Union rb rb' r, Union ra rb r, RowToList ra raL, VariantTags raL, RowToList rb rbL, VariantTags rbL) => GenericSumToVariant (Sum a b) r

class GenericSumToVariantArg rep out | rep -> out where

Give Generic Rep, get Type

Members

• genericSumToVariantArgImpl :: rep -> out
• variantArgImplToGenericSumImpl :: out -> rep

Instances

• GenericSumToVariantArg NoArguments (Record ())

  NoArg encoded as empty record, for convenience (e.g. JSON)

• GenericSumToVariantArg (Argument a) a