Ur/Web: tests/reduce.ur annotate

Tutorial: hyperlinks for metaprogramming and row types

author	Adam Chlipala <adam@chlipala.net>
date	Wed, 20 Jul 2011 08:14:49 -0400
parents	71bafe66dbe1
children

rev	line source
adamc@20	1 con c1 = int
adamc@20	2 con c2 = (fn t :: Type => t) int
adamc@20	3
adamc@20	4 con id = fn t :: Type => t
adamc@20	5 con c3 = id int
adamc@20	6
adamc@20	7 con fst = fn t1 :: Type => fn t2 :: Type => t1
adamc@20	8 con c4 = fst int string
adamc@20	9
adamc@20	10 con snd = fn t1 :: Type => fn t2 :: Type => t2
adamc@20	11 con c5 = snd int string
adamc@20	12
adamc@20	13 con apply = fn f :: Type -> Type => fn t :: Type => f t
adamc@20	14 con c6 = apply id int
adamc@20	15 con c7 = apply (fst int) string
adamc@20	16
adamc@22	17 val tickle = fn n :: Name => fn t :: Type => fn fs :: {Type} =>
adamc@20	18 fn x : $([n = t] ++ fs) => x
adamc@22	19 val tickleA = tickle[#A][int][[B = string]]
adamc@22	20 val test_tickleA = tickleA {A = 6, B = "13"}
adamc@22	21
adamc@22	22 val grab = fn n :: Name => fn t ::: Type => fn fs ::: {Type} =>
adamc@22	23 fn x : $([n = t] ++ fs) => x.n
adamc@22	24 val test_grab1 = grab[#A] {A = 6, B = "13"}
adamc@22	25 val test_grab2 = grab[#B] {A = 6, B = "13"}
adamc@23	26
adamc@23	27 val main = {A = test_grab1, B = test_grab2}

Mercurial > urweb