[erlang-questions] flat representation with erlang term order
Fri May 30 19:30:03 CEST 2008
On 30 May 2008, at 17:57, Paul Mineiro wrote:
> i'm trying to develop a disk based erlang term storage (dets
> using tokyocabinet. i would like the b+tree to be sorted according to
> erlang term order to make certain selects cheap.
> i noticed that erlang:term_to_binary/1 does not preserve term order,
> comparing the resulting binaries with memcmp sometimes disagrees with
> erlang term order. so the easy way is out.
> * alternatively, is there a function i can call from a linked-in
> to compare two binaries derived from erlang:term_to_binary/1 which
> corresponds to erlang term order? tokyocabinet can use an arbitrary
> comparison function (on bytes) so this could work.
There is a C function erl_compare_ext/2 available in the erl_interface
application. You will need to ensure that everything is in the right
format, but once you achieve that, this is probably what you want :-)
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