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[ 原始碼： haskell-ghc-typelits-knownnat  ]

套件：libghc-ghc-typelits-knownnat-dev（0.7.12-1 以及其他的）

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Derive KnownNat constraints from other KnownNat constraints

A type checker plugin for GHC that can derive "complex" KnownNat constraints from other simple/variable KnownNat constraints. i.e. without this plugin, you must have both a KnownNat n and a KnownNat (n+2) constraint in the type signature of the following function:

f :: forall n . (KnownNat n, KnownNat (n+2)) => Proxy n -> Integer f _ = natVal (Proxy :: Proxy n) + natVal (Proxy :: Proxy (n+2))

Using the plugin you can omit the KnownNat (n+2) constraint:

f :: forall n . KnownNat n => Proxy n -> Integer f _ = natVal (Proxy :: Proxy n) + natVal (Proxy :: Proxy (n+2))

The plugin can derive KnownNat constraints for types consisting of: 

 * Type variables, when there is a corresponding KnownNat constraint


 * Type-level naturals


 * Applications of the arithmetic expression: +,-,*,^


 * Type functions, when there is either:

1. a matching given KnownNat constraint; or

2. a corresponding KnownNat<N> instance for the type function

To use the plugin, add the

OPTIONS_GHC -fplugin GHC.TypeLits.KnownNat.Solver

Pragma to the header of your file.

This package provides a library for the Haskell programming language. See http://www.haskell.org/ for more information on Haskell.

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下載 libghc-ghc-typelits-knownnat-dev

下載可用於所有硬體架構的
硬體架構 版本 套件大小 安裝後大小 檔案
amd64 0.7.12-1+b2 66。5 kB520。0 kB [檔案列表]
arm64 0.7.12-1+b2 65。8 kB639。0 kB [檔案列表]
armel 0.7.12-1+b2 77。4 kB643。0 kB [檔案列表]
armhf 0.7.12-1+b2 75。3 kB632。0 kB [檔案列表]
i386 0.7.12-1+b2 100。9 kB671。0 kB [檔案列表]
mips64el 0.7.12-1+b2 88。4 kB946。0 kB [檔案列表]
ppc64el 0.7.12-1+b2 80。4 kB864。0 kB [檔案列表]
riscv64 0.7.12-1+b2 107。0 kB1，091。0 kB [檔案列表]
s390x 0.7.12-1+b2 95。4 kB1，072。0 kB [檔案列表]