[Haskell-cafe] Re: [Haskell] Top Level TWI's again

[Marcin 'Qrczak' Kowalczyk]

Benjamin Franksen <benjamin.franksen at bessy.de> writes:

>> stdin = makeHandle 0
>> stdout = makeHandle 1
>> stderr = makeHandle 2
>>
>> in absolutely pure Haskell, only the things that manipulate them need
>> be in the IO monad.
>
> If they were simple wrappers around the integers, you'd be right and I 
> couldn't rightfully object to them being top-level values.

They generally have buffers. And stdin remembers when it has been
closed and refuses to be read further.

-- 
   __("<         Marcin Kowalczyk
   \__/       qrczak at knm.org.pl
    ^^     http://qrnik.knm.org.pl/~qrczak/