[Haskell-cafe] Simple hash table creation

[Daniel Fischer]

Am Dienstag 17 November 2009 20:36:46 schrieb Daniel Fischer:
> What you probably wanted was
>
> type MyHashTable = HashTable String Int -- not data MyHashTable
>

Just in case it's not clear:

> ht <- new (==) dummy :: IO MyHashTable

only works at the prompt or in an IO do-block, not at the top level of the module.

>
> then ht is a hashtable of type MyHashTable.