[erlang-questions] bit syntax: 0-sized segments

Max Lapshin <>
Fri Mar 8 09:30:10 CET 2013


0:Pad

Pad can be zero-length.


On Fri, Mar 8, 2013 at 12:32 PM, Kostis Sagonas <> wrote:

> On 03/08/2013 08:58 AM, Ulf Wiger wrote:
>
>>
>> On 8 Mar 2013, at 08:38, Dan Gudmundsson wrote:
>>
>>  Another nice thing with 0 sized integers is when you add alignment
>>> bits in protocols, in both
>>> matching and creation.
>>>
>>
>> I make use of this in sext as well, in a number of places:
>>
>> encode_bin_elems(<<>>) ->
>>      <<8>>;
>> encode_bin_elems(B) ->
>>      Pad = 8 - (size(B) rem 8),
>>      <<  (<<  <<1:1, B1:8>>  ||<<B1>>  <= B>>)/bitstring, 0:Pad, 8>>.
>>
>
> I fail to see where this creates a 0-sized integer...
>
> Kostis
>
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