15 Jan
2009
15 Jan
'09
3:51 p.m.
duncan.coutts:
On Thu, 2009-01-15 at 19:46 +0000, Andrew Coppin wrote:
PS. As a small aside... Is the Monoid class actually used *anywhere* in all of Haskell?
Yes.
They're used quite a lot in Cabal. Package databases are monoids. Configuration files are monoids. Command line flags and sets of command line flags are monoids. Package build information is a monoid.
It is also used in the Foldable class which is a nice interface for traversing/visiting structures. Binary serialisation is also a monoid.
Also, xmonad configuration hooks are monoidal. So all those xmonad users gluing together keybindings are using the Monoid class. -- Don