Proposal: Add concatMapM function (#2042)
rl at cse.unsw.edu.au
Fri Feb 1 04:44:06 EST 2008
Aaron Denney wrote:
> On 2008-02-01, Roman Leshchinskiy <rl at cse.unsw.edu.au> wrote:
>> Bulat Ziganshin wrote:
>>> the right way to deal with "modifiers" is to attach them to the Handle
>>> itself like this:
>>> f <- openFile "name" >>= withLocking >>= withEncoding utf8
>> IMO, global state is never "the right way" if it can be avoided. It will
>> always lead to problems. Especially in a functional language like Haskell.
> This isn't global state, but local to the handle, and only affects where
> the handle is passed in. It's just extending an opaque data type.
If I can destructively change the encoding assocated with a Handle, then
it's global state.
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