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Description

An implementation of extensible products and sums.

summer

Hackage Build Status

Extensible sums and products for Haskell.

x :: Sum '[Int, Bool, Float]
x = Inj True

y :: Sum '[Int, Float, Bool, Char]
y = weaken x

a :: Bool
a = match y (== 10) (== 0.2) id (== 'x')

x' :: Prod '[Int, Float, Bool, Char]
x' = produce $ \f -> f 10 0.2 True 'x'

y' :: Prod '[Bool, Float]
y' = strengthen x'

a' :: Bool
a' = consume y' (\b f -> b && f == 0.2)

q :: Bool
q = select x' $ \b (f :: Float)-> b && f == 0.2

This package is extremely experimental, and is subject to arbitrarily large changes.

Metadata

Version

0.3.7.2

License

Platforms (75)

    Darwin
    FreeBSD
    Genode
    GHCJS
    Linux
    MMIXware
    NetBSD
    none
    OpenBSD
    Redox
    Solaris
    WASI
    Windows
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