[erlang-questions] Offset calculation in bit syntax
Mon Nov 26 14:35:46 CET 2007
> There is bug in your code I think.
> Correct code should be:
> decode(<<L:8/unsigned, R/binary>>) ->
> Len = (L - 16#20)*8,
> <<Rest:Len/unsigned, _/binary>> = R,
That's how I ended solving it, but there was also a bug in the way I
specified the problem, what I was attempting to ask was whether
something this was possible:
decode(<<L:8,Bin:(L - 16#20)/binary,Rest/binary>>) -> Bin.
So decode(<<16#23,"abcdefg">>) would return <<"abc">>.
Essentially this is the same thing as your solution, only expressed in
a more compact format. However, it doesn't appear to be a legal
operation in Erlang bit syntax.
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