[erlang-questions] behavior of funktions

Johannes <>
Tue Jul 24 23:43:28 CEST 2007


anders told me that the source i wanted to use is very old.
i searched just a few minutes today, so i did not recognize.
of course ill use a newer version, ill try this one
http://www.erlang.org/download/otp_src_R11B-5.tar.gz
i recognized that i got a very old version

Johannes schrieb:
> i thought bout adding this future to the erts.
> to handle functions with side effekts i thought of useing
>  ::funname or module::funname
> to enable this future.
> Is there any problem with using '::'? or should i use other letters ?
> 
> today i got the sourecode of erlang from
> http://www.erlang.org/download/otp_src_R7B-1.tar.gz and started to
> search for the code of erl.
> What is the file i have to modify ?? and what are the files assigned to
> erl ??
> 
> greatz Johannes
> Johannes schrieb:
>> hi, i have a question about the behavior of funktions.
>> if theres a function:
>> f(A,0) ->
>> 	1;
>> f(A,B) ->
>> 	[f(A,B-1),f(A,B-1)].
>> how often is f(A,B-1) evaluated then ? just one time, and erlang tooks
>> the result everywhere where it fits, like f(A,B) -> TMP=f(A,B-1),[TMP;TMP].
>> or is it evaluated every time again ??
>>
>> greatz Johannes
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>> 
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>>
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