[Haskell-cafe] Re: [Haskell] Top Level <-
ganesh at earth.li
Sun Aug 31 10:34:33 EDT 2008
On Sun, 31 Aug 2008, Brandon S. Allbery KF8NH wrote:
> On 2008 Aug 31, at 10:29, Ganesh Sittampalam wrote:
>> On Sun, 31 Aug 2008, Brandon S. Allbery KF8NH wrote:
>>> On 2008 Aug 31, at 10:20, Ganesh Sittampalam wrote:
>>>> I'm not sure of precisely what you mean here, but stdin, stdout and
>>>> stderr are things provided by the OS to a process. That's what defines
>>>> them as having process scope, not something the Haskell language or RTS
>>> But their representations in Haskell must have the same scope and are
>>> therefore de facto global variables.
>> Yep, but this is not Haskell providing a way to make global variables, it
>> is just providing an interface to ones that already exist. The point is
>> that the RTS can't provide (process-scope)
> But that is done the same way as providing general global variables, so you
> can't get away from it.
I don't follow what you mean. stdin, stdout and stderr are just file
descriptors 0, 1 and 2, aren't they? You can create them as many times as
you want with using that information without causing any confusion or
conflict. Whereas the <- proposal has a "once-only" requirement.
More information about the Haskell-Cafe