xml in fptools?
simonmarhaskell at gmail.com
Fri May 26 11:17:43 EDT 2006
Bulat Ziganshin wrote:
> Hello Simon,
> Friday, May 26, 2006, 2:52:34 PM, you wrote:
>>>Assuming we do have imprecise exceptions what is wrong with lazy IO?
>>I'm not even certain that lazy I/O doesn't upset referential
>>transparency. It seems hard to construct a concrete counter example
>>though. My intuition is something like this: if evaluating a thunk can
>>cause IO to take place, then the act of evaluating that thunk might
>>affect the value of another lazy I/O computation, and hence it should be
>>possible to get different results by evaluating the thunks in a
>>different order. I'm concerned that in the presence of dependencies
>>between lazy I/O computations, the order of evaluation might be visible.
> of course it can if, or example, we evaluate two hGetContents on the
> same Handle; or read the file that is written by other computation
Both of those are illegal in Haskell. It might be possible to construct
an example using pipes, though.
More information about the Libraries