Packages

  • package root
    Definition Classes
    root
  • package cats

    The cats root package contains all the trait signatures of most Scala type classes.

    The cats root package contains all the trait signatures of most Scala type classes.

    Cats type classes are implemented using the approach from the Type classes as objects and implicits article.

    For each type class, cats provides three pieces: - Its signature: a trait that is polymorphic on a type parameter. Type class traits inherit from other type classes to indicate that any implementation of the lower type class (e.g. Applicative) can also serve as an instance for the higuer type class (e.g. Functor). - Type class 'instances, which are classes and objects that implement one or more type class signatures for some specific types. Type class instances for several data types from the Java or Scala standard libraries are declared in the subpackage cats.instances. - Syntax extensions, each of which provides the methods of the type class defines as extension methods (which in Scala 2 are encoded as implicit classes) for values of any type F; given that an instance of the type class for the receiver type (this) is in the implicit scope. Symtax extensions are declared in the cats.syntax package. - A set of laws, that are also generic on the type of the class, and are only defined on the operations of the type class. The purpose of these laws is to declare some algebraic relations (equations) between Scala expressions involving the operations of the type class, and test (but not verify) that implemented instances satisfy those equations. Laws are defined in the cats-laws package.

    Although most of cats type classes are declared in this package, some are declared in other packages: - type classes that operate on base types (kind *), and their implementations for standard library types, are contained in cats.kernel, which is a different SBT project. However, they are re-exported from this package. - type classes of kind F[_, _], such as cats.arrow.Profunctor" or cats.arrow.Arrow, which are relevant for Functional Reactive Programming or optics, are declared in the cats.arrow package. - Also, those type classes that abstract over (pure or impure) functional runtime effects are declared in the cats-effect library. - Some type classes for which no laws can be provided are left out of the main road, in a small and dirty alley. These are the alleycats.

    Definition Classes
    root
  • package data
    Definition Classes
    cats
  • AndThen
  • AppFunc
  • Binested
  • BinestedBifoldable
  • BinestedBitraverse
  • BinestedInstances
  • Chain
  • Cokleisli
  • Const
  • Cont
  • ContT
  • EitherK
  • EitherT
  • Func
  • IdT
  • IndexedReaderWriterStateT
  • IndexedState
  • IndexedStateT
  • Ior
  • IorT
  • Kleisli
  • KleisliFromFunctionPartiallyApplied
  • Nested
  • NonEmptyChainOps
  • NonEmptyList
  • NonEmptyMapOps
  • NonEmptySeq
  • NonEmptySetOps
  • NonEmptyVector
  • OneAnd
  • Op
  • OptionT
  • Reader
  • ReaderWriterState
  • ReaderWriterStateT
  • RepresentableStore
  • State
  • StateT
  • Store
  • Tuple2K
  • Validated
  • Writer
  • WriterT
  • ZipList
  • ZipSeq
  • ZipStream
  • ZipVector

object Const extends ConstInstances with Serializable

Linear Supertypes
Serializable, Serializable, ConstInstances, ConstInstances0, ConstInstances1, ConstInstances2, ConstInstances3, ConstInstances4, AnyRef, Any
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Inherited
  1. Const
  2. Serializable
  3. Serializable
  4. ConstInstances
  5. ConstInstances0
  6. ConstInstances1
  7. ConstInstances2
  8. ConstInstances3
  9. ConstInstances4
  10. AnyRef
  11. Any
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Visibility
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Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  5. implicit def catsDataAlignForConst[A](implicit arg0: Semigroup[A]): Align[[β$0$]Const[A, β$0$]]
    Definition Classes
    ConstInstances
  6. implicit def catsDataApplicativeForConst[C](implicit C: Monoid[C]): Applicative[[β$14$]Const[C, β$14$]]
    Definition Classes
    ConstInstances2
  7. implicit def catsDataApplyForConst[C](implicit C: Semigroup[C]): Apply[[β$15$]Const[C, β$15$]]
    Definition Classes
    ConstInstances3
  8. implicit val catsDataBifoldableForConst: Bifoldable[Const]
    Definition Classes
    ConstInstances
  9. implicit def catsDataCommutativeApplicativeForConst[C](implicit C: CommutativeMonoid[C]): CommutativeApplicative[[β$10$]Const[C, β$10$]]
    Definition Classes
    ConstInstances0
  10. implicit def catsDataCommutativeApplyForConst[C](implicit C: CommutativeSemigroup[C]): CommutativeApply[[β$12$]Const[C, β$12$]]
    Definition Classes
    ConstInstances1
  11. implicit def catsDataContravariantForConst[C]: Contravariant[[β$17$]Const[C, β$17$]]
    Definition Classes
    ConstInstances4
  12. implicit def catsDataContravariantMonoidalForConst[D](implicit arg0: Monoid[D]): ContravariantMonoidal[[β$8$]Const[D, β$8$]]
    Definition Classes
    ConstInstances0
  13. implicit def catsDataEqForConst[A, B](implicit arg0: Eq[A]): Eq[Const[A, B]]
    Definition Classes
    ConstInstances3
  14. implicit def catsDataFunctorForConst[C]: Functor[[β$16$]Const[C, β$16$]]
    Definition Classes
    ConstInstances4
  15. implicit def catsDataLowerBoundedForConst[A, B](implicit A: LowerBounded[A]): LowerBounded[Const[A, B]]
    Definition Classes
    ConstInstances
  16. implicit def catsDataMonoidForConst[A, B](implicit arg0: Monoid[A]): Monoid[Const[A, B]]
    Definition Classes
    ConstInstances
  17. implicit def catsDataOrderForConst[A, B](implicit arg0: Order[A]): Order[Const[A, B]]
    Definition Classes
    ConstInstances
  18. implicit def catsDataPartialOrderForConst[A, B](implicit arg0: PartialOrder[A]): PartialOrder[Const[A, B]]
    Definition Classes
    ConstInstances2
  19. implicit def catsDataSemigroupForConst[A, B](implicit arg0: Semigroup[A]): Semigroup[Const[A, B]]
    Definition Classes
    ConstInstances2
  20. implicit def catsDataShowForConst[A, B](implicit arg0: Show[A]): Show[Const[A, B]]
    Definition Classes
    ConstInstances
  21. implicit def catsDataTraverseFilterForConst[C]: TraverseFilter[[β$5$]Const[C, β$5$]]
    Definition Classes
    ConstInstances
  22. implicit def catsDataTraverseForConst[C]: Traverse[[β$3$]Const[C, β$3$]]
    Definition Classes
    ConstInstances
  23. implicit def catsDataUpperBoundedForConst[A, B](implicit A: UpperBounded[A]): UpperBounded[Const[A, B]]
    Definition Classes
    ConstInstances
  24. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()
  25. def empty[A, B](implicit A: Monoid[A]): Const[A, B]
  26. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  27. def equals(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  28. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  29. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  30. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  31. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  32. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  33. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  34. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  35. def of[B]: OfPartiallyApplied[B]

    Convenient syntax for creating a Const[A, B] from an A

    Convenient syntax for creating a Const[A, B] from an A

    scala> import cats.data._
    scala> Const.of[Int]("a")
    res0: Const[String, Int] = Const(a)
  36. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  37. def toString(): String
    Definition Classes
    AnyRef → Any
  38. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  39. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  40. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()

Inherited from Serializable

Inherited from Serializable

Inherited from ConstInstances

Inherited from ConstInstances0

Inherited from ConstInstances1

Inherited from ConstInstances2

Inherited from ConstInstances3

Inherited from ConstInstances4

Inherited from AnyRef

Inherited from Any

Ungrouped