On Thu, Sep 04, 2003 at 10:45:17AM +0100, Simon Marlow wrote:
> > However, the definition of bracket relies on block and
> > unblock, which have the
> > following types:
> > > bracket :: IO a -> (a -> IO b) -> (a -> IO c) -> IO c
> > > block :: IO a -> IO a
> > > unblock :: IO a -> IO a
> >
> > T
Hi,
On Thu, Sep 04, 2003 at 10:45:17AM +0100, Simon Marlow wrote:
> >
> > Would anything prevent block, unblock, bracket (and other similar
> > functions working on IO actions) from being generalized to all
> > intances of MonadIO?
>
> I'm afraid I can't see a way to generalise the types of block
> However, the definition of bracket relies on block and
> unblock, which have the
> following types:
> > bracket :: IO a -> (a -> IO b) -> (a -> IO c) -> IO c
> > block :: IO a -> IO a
> > unblock :: IO a -> IO a
>
> This forces f to be an IO action in the above withQuery
> function. If bracke
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Hello,
I'm trying to make generic helper functions for database querying. I would
like to be able to define functions that work for every monad that holds a
database connection and is built on top of the IO monad. For this, I have
defined the follow
