[Haskell-cafe] Strict and non-strict vs eager and lazy, was C onfused about Cyclic struture

[Jan-Willem Maessen]

On Jul 18, 2005, at 10:19 AM, Bayley, Alistair wrote:
>> From: Jerzy Karczmarczuk [mailto:karczma at info.unicaen.fr]
>>
>> Bernard Pope wrote:
>>
>>> I'll be a little bit pedantic here. Haskell, the language definition,
>>> does not prescribe lazy evaluation. It says that the language is
>>> non-strict. Lazy evaluation is an implementation technique which
>>> satisfies non-strict semantics, but it is not the only
>> technique which
>>> does this.
>>>
>>>
>> This pedantry is renewed periodically.
>>
>> It is a pity that nobody ever writes anything about that other
>> methods of implementation of non-strictness, nor about the
>> languages which use those methods.
>>
>> I believe it might do some good to people who learn functional
>> programming in general, and Haskell in particular.
>> Any takers?
>
>
> Not a taker (yet - where can I find information about non-lazy
> implementation of non-strict languages? From Google so far: speculative
> evaluation (Eager Haskell), call-by-name vs call-by-need.)
>
> Wikipedia frustratingly hints that "other evaluation strategies are
> possible", but that's all it says:
> http://en.wikipedia.org/wiki/Non-strict_programming_language

I volunteered to Jerzy privately, but I'm still not clear what it is 
people want to know.  That'd be more useful than, say, plugging my own 
research. :-)

-Jan-Willem Maessen

>
>
> Alistair.
>
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