Ur/Web: demo/tcSum.ur annotate

Pattern typing

author	Adam Chlipala <adamc@hcoop.net>
date	Sat, 29 Nov 2008 10:49:47 -0500
parents	e0e9e9eca1cb
children	6c4643880df5

rev	line source
adamc@417	1 fun sum (t ::: Type) (_ : num t) (fs ::: {Unit}) (x : $(mapUT t fs)) =
adamc@417	2 foldUR [t] [fn _ => t]
adamc@417	3 (fn (nm :: Name) (rest :: {Unit}) [[nm] ~ rest] n acc => n + acc)
adamc@417	4 zero [fs] x
adamc@417	5
adamc@417	6 fun main () = return <xml><body>
adamc@417	7 {[sum {A = 0, B = 1}]}<br/>
adamc@417	8 {[sum {C = 2.1, D = 3.2, E = 4.3}]}
adamc@417	9 </body></xml>

Mercurial > urweb