[erlang-questions] binary:part/2/3

[Zabrane Mickael]

Hi guys,

I'd like to know if the binary returned by "binary:part/2/3" (http://www.erlang.org/doc/man/binary.html#part-2)

is always referencing Subject (i.e a sub-binary) or not?

The doc is clear about this fact for "binary:split/2/3" but nothing is mentionned for "binary:part/2/3".

Regards,

Zabrane

[Jesper Louis Andersen]

Try looking at the source. If I remember correctly, binary:split uses binary:part inside. If this is the case, then you can update the documentation as well to reflect the fact.

Jesper Louis Andersen
Erlang Solutions Ltd., Copenhagen

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[Zabrane Mickael]

Hi Jesper,

You're right. From "binary.erl" source code:

[..]
split(Haystack,Needles,Options) ->
...
do_split(Haystack,MList,0,Trim)
...


do_split(H,[],N,true) when N >= byte_size(H) ->
[];
do_split(H,[],N,_) ->
[binary:part(H,{N,byte_size(H)-N})]; <---- HERE
do_split(H,[{A,B}|T],N,Trim) ->
case binary:part(H,{N,A-N}) of <---- HERE
...

So yes, binary:split uses binary:part for sure.

Can OTP guys confirm this fact now?

Regards,
Zabrane