indexed-list-literals

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