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The latest version of indexed-list-literals is 0.2.1.3-0.

indexed-list-literals

Version 0.2.0.0 revision 0 uploaded by DavidMD.

Package meta

Synopsis
Type safe indexed list literals
Description

This is an incredibly simple library, which makes writing lists where the length is known at compile time a little bit nicer.

If you write a function with the signature

vector :: ILL input length output => input -> Vector length output

then

v :: Vector 3 Int
v = vector (1,2,3)

x :: Vector 0 Double
x = vector $ ZeroTuple @Double

y :: Vector 1 Double
y = vector (Only 1)

z :: Vector 2 String
z = vector ("Hello", "World")

If want matrix literals you can write a function

matrix :: (ILL row width ty, ILL matrix height row) => matrix -> Matrix width height ty

then

a :: Matrix 0 0 Bool
a = matrix $ ZeroTuple @(ZeroTuple Bool)

b :: Matrix 1 2 String
b = matrix $ Only ("Hello","World")

c :: Matrix 4 5 Double
c = matrix ((1,2,3,0,0)
           ,(4,5,6,0,0)
           ,(7,8,9,0,0)
           ,(0,0,0,0,0))

The full code is in test/Docs.hs

This only supports literals of length up to 20, though that can be easily extended using the code generator in src/Data/IndexedListLiterals.hs

Author
David Millar-Durrant
Bug reports
n/a
Category
Data
Copyright
n/a
Homepage
https://github.com/davidm-d/indexed-list-literals
Maintainer
dmillardurrant@gmail.com
Package URL
n/a
Stability
n/a

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