3 ms·

Thanks for the example. Is there a way to perform a positive and negative look-ahead instead of just reading the remaining data to end of input?

• eproxus 5y ago
  You also have Erlang’s pattern matching at your disposal: decode(<<16#01, Size:8, Payload:Size/binary-unit:8, Rest/binary>>) -> [{field1, Payload}|decode(Rest)]; decode(<<16#02, Flags:16, Rest/binary>>) when Flags =:= 1 -> [{field2, true}|decode(Rest)]; decode(<<16#02, Flags:16, Rest/binary>>) -> [{field2, false}|decode(Rest)]. Anything after the when keyword is a guard condition allowing for some manner of positive/negative “look ahead” (Contrived example, but maybe you get the point).
  • lsllc 5y ago
    Yes, this is exactly how you do it, with pattern matching & guards!