Re: [Haskell-cafe] what does the '~' mean ?

On 16 April 2010 15:59, zaxis 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@gmail.com IvanMiljenovic.wordpress.com