view libtests/notes @ 458:913a95f06998 api-inversion

Start using the query state structure.

Actually using it means moving it around in the source code a little
bit, thanks to entanglements.  It'll all be alright on the night.  Now
the accumulator, allowed_keys and exact_evaluation_queue are all part of
the query state, and can therefore be passed around with minimal effort
(and deleted in the appropriate place).

Now a whole bunch of static methods (the callbacks, basically) in
index.cpp can be rewritten as plain old C functions.  The callbacks need
both an adb_t and a query state structure to function (the adb_t to get
at things like lsh_n_point_bits and the track->key table; the qstate to
get at the accumulator and allowed_keys list).

Rearrange audioDB::query a little bit, and mark the beginning and the
end of the putative audiodb_query_spec() API function implementation.

test 23 in original: is there a testquery point missing?

ask Christophe about 24: testtimes file has 1 entry too many