Safe Haskell | Trustworthy |
---|---|

Language | Haskell2010 |

This module is an internal GHC module. It declares the constants used in the implementation of type-level natural numbers. The programmer interface for working with type-level naturals should be defined in a separate library.

Since: base-4.10.0.0

(Kind) This is the kind of type-level natural numbers.

class KnownNat (n :: Nat) Source

This class gives the integer associated with a type-level natural. There are instances of the class for every concrete literal: 0, 1, 2, etc.

Since: base-4.7.0.0

natSing

natVal :: forall n proxy. KnownNat n => proxy n -> Natural Source

Since: base-4.10.0.0

natVal' :: forall n. KnownNat n => Proxy# n -> Natural Source

Since: base-4.10.0.0

This type represents unknown type-level natural numbers.

Since: base-4.10.0.0

Eq SomeNat | Since: base-4.7.0.0 |

Ord SomeNat | Since: base-4.7.0.0 |

Read SomeNat | Since: base-4.7.0.0 |

Show SomeNat | Since: base-4.7.0.0 |

someNatVal :: Natural -> SomeNat Source

Convert an integer into an unknown type-level natural.

Since: base-4.10.0.0

sameNat :: (KnownNat a, KnownNat b) => Proxy a -> Proxy b -> Maybe (a :~: b) Source

We either get evidence that this function was instantiated with the same type-level numbers, or `Nothing`

.

Since: base-4.7.0.0

type (<=) x y = (x <=? y) ~ True infix 4 Source

Comparison of type-level naturals, as a constraint.

Since: base-4.7.0.0

type family (m :: Nat) <=? (n :: Nat) :: Bool infix 4 Source

Comparison of type-level naturals, as a function. NOTE: The functionality for this function should be subsumed by `CmpNat`

, so this might go away in the future. Please let us know, if you encounter discrepancies between the two.

type family (m :: Nat) + (n :: Nat) :: Nat infixl 6 Source

Addition of type-level naturals.

Since: base-4.7.0.0

type family (m :: Nat) * (n :: Nat) :: Nat infixl 7 Source

Multiplication of type-level naturals.

Since: base-4.7.0.0

type family (m :: Nat) ^ (n :: Nat) :: Nat infixr 8 Source

Exponentiation of type-level naturals.

Since: base-4.7.0.0

type family (m :: Nat) - (n :: Nat) :: Nat infixl 6 Source

Subtraction of type-level naturals.

Since: base-4.7.0.0

type family CmpNat (m :: Nat) (n :: Nat) :: Ordering Source

Comparison of type-level naturals, as a function.

Since: base-4.7.0.0

type family Div (m :: Nat) (n :: Nat) :: Nat infixl 7 Source

Division (round down) of natural numbers. `Div x 0`

is undefined (i.e., it cannot be reduced).

Since: base-4.11.0.0

type family Mod (m :: Nat) (n :: Nat) :: Nat infixl 7 Source

Modulus of natural numbers. `Mod x 0`

is undefined (i.e., it cannot be reduced).

Since: base-4.11.0.0

type family Log2 (m :: Nat) :: Nat Source

Log base 2 (round down) of natural numbers. `Log 0`

is undefined (i.e., it cannot be reduced).

Since: base-4.11.0.0

© The University of Glasgow and others

Licensed under a BSD-style license (see top of the page).

https://downloads.haskell.org/~ghc/8.6.1/docs/html/libraries/base-4.12.0.0/GHC-TypeNats.html