magnolia
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magnolia/magnolia1/Derivation

Derivation

magnolia1.Derivation
trait Derivation[TypeClass[_]] extends CommonDerivation[TypeClass], SealedTraitDerivation

Attributes

Graph
Supertypes
trait CommonDerivation[TypeClass]
class Object
trait Matchable
class Any
Known subtypes
trait AutoDerivation[TypeClass]

Members list

Type members

Inherited types

type Typeclass[T] = TypeClass[T]

Attributes

Inherited from:
CommonDerivation

Value members

Abstract methods

def split[T](sealedTrait: SealedTrait[Typeclass, T]): TypeClass[T]

This must be implemented by the user of Magnolia to construct a Typeclass for 'T', where 'T' is a Sealed Trait or Scala 3 Enum, using the provided type info. E.g. if we are deriving 'Show[T]' typeclasses, and T is an enum 'Suit' (eg with values Diamonds, Clubs, etc), we need to constuct 'Show[Suit]'.

This must be implemented by the user of Magnolia to construct a Typeclass for 'T', where 'T' is a Sealed Trait or Scala 3 Enum, using the provided type info. E.g. if we are deriving 'Show[T]' typeclasses, and T is an enum 'Suit' (eg with values Diamonds, Clubs, etc), we need to constuct 'Show[Suit]'.

This method is called 'split' because it will ''split'' the different possible types of the SealedTrait, and handle each one to finally produce a typeclass capable of handling any possible subtype of the trait.

A useful function for implementing this method is SealedTrait#choose, which can take a value instance and provide information on the specific subtype of the sealedTrait which that value is.

Attributes

Concrete methods

inline override protected def deriveSubtype[s](m: Of[s]): TypeClass[s]

Attributes

Definition Classes
inline def derived[A](using Of[A]): TypeClass[A]
inline def derivedMirror[A](using mirror: Of[A]): TypeClass[A]
inline def derivedMirrorSum[A](sum: SumOf[A]): TypeClass[A]
transparent inline def subtypes[T, SubtypeTuple <: Tuple](m: SumOf[T], idx: Int): List[Subtype[Typeclass, T, _]]

Inherited methods

inline def `getParams__`[T, Labels <: Tuple, Params <: Tuple](annotations: Map[String, List[Any]], inheritedAnnotations: Map[String, List[Any]], typeAnnotations: Map[String, List[Any]], repeated: Map[String, Boolean], defaults: Map[String, Option[() => Any]], idx: Int): List[Param[Typeclass, T]]

Attributes

Inherited from:
CommonDerivation
inline def derivedMirrorProduct[A](product: ProductOf[A]): TypeClass[A]

Attributes

Inherited from:
CommonDerivation
inline def getParams[T, Labels <: Tuple, Params <: Tuple](annotations: Map[String, List[Any]], typeAnnotations: Map[String, List[Any]], repeated: Map[String, Boolean], idx: Int): List[Param[Typeclass, T]]

Attributes

Inherited from:
CommonDerivation
inline def getParams_[T, Labels <: Tuple, Params <: Tuple](annotations: Map[String, List[Any]], inheritedAnnotations: Map[String, List[Any]], typeAnnotations: Map[String, List[Any]], repeated: Map[String, Boolean], idx: Int): List[Param[Typeclass, T]]

Attributes

Inherited from:
CommonDerivation
def join[T](caseClass: CaseClass[Typeclass, T]): TypeClass[T]

Must be implemented by the user of Magnolia to construct a typeclass for case class T using the provided type info. E.g. if we are deriving Show[T] typeclasses, and T is a case class Foo(...), we need to constuct Show[Foo].

Must be implemented by the user of Magnolia to construct a typeclass for case class T using the provided type info. E.g. if we are deriving Show[T] typeclasses, and T is a case class Foo(...), we need to constuct Show[Foo].

This method is called 'join' because typically it will join together the typeclasses for all the parameters of the case class, into a single typeclass for the case class itself. The field CaseClass.params can provide useful information for doing this.

Value parameters

caseClass

information about the case class T, its parameters, and their typeclasses

Attributes

Inherited from:
CommonDerivation
inline protected def sealedTraitFromMirror[A](m: SumOf[A]): SealedTrait[Typeclass, A]

Attributes

Inherited from:
SealedTraitDerivation
transparent inline protected def subtypesFromMirror[A, SubtypeTuple <: Tuple](m: SumOf[A], idx: Int): List[Subtype[Typeclass, A, _]]

Attributes

Inherited from:
SealedTraitDerivation
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