Mercurial > urweb

view tests/datatypeP.ur @ 1892:907a82a44f01

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Add missing inter-library dependencies This is needed, at least on recent Ubuntu, to fix these linker errors when compiling any Ur/Web application: liburweb.so: undefined reference to `lround' liburweb.so: undefined reference to `ceil' liburweb.so: undefined reference to `RAND_bytes' liburweb.so: undefined reference to `DES_fcrypt' liburweb.so: undefined reference to `SHA256_Init' liburweb.so: undefined reference to `SHA256_Final' liburweb.so: undefined reference to `SHA256_Update' Signed-off-by: Anders Kaseorg <andersk@mit.edu> --- src/c/Makefile.am | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
author Anders Kaseorg <andersk@mit.edu>
date Thu, 21 Nov 2013 14:32:11 -0500
parents 71bafe66dbe1
children
line wrap: on
line source
datatype option a = None | Some of a

val none : option int = None
val some_1 : option int = Some 1

val f = fn t ::: Type => fn x : option t =>
        case x of None => None | Some x => Some (Some x)

val none_again = f none
val some_1_again = f some_1

val show = fn t ::: Type => fn x : option t => case x of None => "None" | Some _ => "Some"

val page = fn x => <html><body>
        {cdata (show x)}
</body></html>

val main : unit -> page = fn () => <html><body>
        <li><a link={page none_again}>None</a></li>
        <li><a link={page some_1_again}>Some 1</a></li>
</body></html>