[Haskell-cafe] what does the '~' mean ?
ivan.miljenovic at gmail.com
Fri Apr 16 02:09:33 EDT 2010
On 16 April 2010 15:59, zaxis <z_axis at 163.com> wrote:
> instance (BinaryDefer a, BinaryDefer b) => BinaryDefer (a,b) where
> put (a,b) = put2 a b
> get = get2 (,)
> size x = let ~(a,b) = x in size a + size b
> putFixed (a,b) = putFixed2 a b
> getFixed = getFixed2 (,)
> in `size` function, what does the `~` mean ?
A lazy pattern match: http://en.wikibooks.org/wiki/Haskell/Laziness
(there is a better name for it, but I can't remember).
Ivan Lazar Miljenovic
Ivan.Miljenovic at gmail.com
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