LeibnizFunctions

Value Members

1. final def !=(arg0: Any): Boolean

   

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2. final def ##(): Int

   

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3. final def ==(arg0: Any): Boolean

   

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4. final def asInstanceOf[T0]: T0

   

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5. def clone(): AnyRef

   

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6. final def eq(arg0: AnyRef): Boolean

   

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7. def equals(arg0: Any): Boolean

   

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8. def finalize(): Unit

   

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9. def force[L, H >: L, A >: L <: H, B >: L <: H]: Leibniz[L, H, A, B]

   

   Unsafe coercion between types.

   Unsafe coercion between types. force abuses asInstanceOf to explicitly coerce types. It is unsafe, but needed where Leibnizian equality isn't sufficient

10. final def getClass(): Class[_]

    

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11. def hashCode(): Int

    

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12. final def isInstanceOf[T0]: Boolean

    

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13. def lift[LA, LT, HA >: LA, HT >: LT, T[_ >: LA <: HA] >: LT <: HT, A >: LA <: HA, A2 >: LA <: HA](a: Leibniz[LA, HA, A, A2]): Leibniz[LT, HT, T[A], T[A2]]

    

    We can lift equality into any type constructor

14. def lift2[LA, LB, LT, HA >: LA, HB >: LB, HT >: LT, T[_ >: LA <: HA, _ >: LB <: HB] >: LT <: HT, A >: LA <: HA, A2 >: LA <: HA, B >: LB <: HB, B2 >: LB <: HB](a: Leibniz[LA, HA, A, A2], b: Leibniz[LB, HB, B, B2]): Leibniz[LT, HT, T[A, B], T[A2, B2]]

    

    We can lift equality into any type constructor

15. def lift3[LA, LB, LC, LT, HA >: LA, HB >: LB, HC >: LC, HT >: LT, T[_ >: LA <: HA, _ >: LB <: HB, _ >: LC <: HC] >: LT <: HT, A >: LA <: HA, A2 >: LA <: HA, B >: LB <: HB, B2 >: LB <: HB, C >: LC <: HC, C2 >: LC <: HC](a: Leibniz[LA, HA, A, A2], b: Leibniz[LB, HB, B, B2], c: Leibniz[LC, HC, C, C2]): Leibniz[LT, HT, T[A, B, C], T[A2, B2, C2]]

    

    We can lift equality into any type constructor

16. def lower[LA, HA >: LA, T[_ >: LA <: HA], A >: LA <: HA, A2 >: LA <: HA](t: ===[T[A], T[A2]]): Leibniz[LA, HA, A, A2]

    

    Emir Pasalic's PhD thesis mentions that it is unknown whether or not ((A,B) === (C,D)) => (A === C) is inhabited.

    Emir Pasalic's PhD thesis mentions that it is unknown whether or not ((A,B) === (C,D)) => (A === C) is inhabited.

    Haskell can work around this issue by abusing type families as noted in Leibniz equality can be injective (Oleg Kiselyov, Haskell Cafe Mailing List 2010) but we instead turn to force.

17. def lower2[LA, HA >: LA, LB, HB >: LB, T[_ >: LA <: HA, _ >: LB <: HB], A >: LA <: HA, A2 >: LA <: HA, B >: LB <: HB, B2 >: LB <: HB](t: ===[T[A, B], T[A2, B2]]): (Leibniz[LA, HA, A, A2], Leibniz[LB, HB, B, B2])

    

18. final def ne(arg0: AnyRef): Boolean

    

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19. final def notify(): Unit

    

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20. final def notifyAll(): Unit

    

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21. implicit def refl[A]: Leibniz[A, A, A, A]

    

    Equality is reflexive -- we rely on subtyping to expand this type

22. implicit def subst[A, B](a: A)(implicit f: ===[A, B]): B

    

23. def symm[L, H >: L, A >: L <: H, B >: L <: H](f: Leibniz[L, H, A, B]): Leibniz[L, H, B, A]

    

    Equality is symmetric

24. final def synchronized[T0](arg0: ⇒ T0): T0

    

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25. def toString(): String

    

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26. def trans[L, H >: L, A >: L <: H, B >: L <: H, C >: L <: H](f: Leibniz[L, H, B, C], g: Leibniz[L, H, A, B]): Leibniz[L, H, A, C]

    

    Equality is transitive

27. final def wait(): Unit

    

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28. final def wait(arg0: Long, arg1: Int): Unit

    

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29. final def wait(arg0: Long): Unit

    

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30. implicit def witness[A, B](f: ===[A, B]): (A) ⇒ B

    

    We can witness equality by using it to convert between types We rely on subtyping to enable this to work for any Leibniz arrow