comparison close.cpp @ 693:b1723ae7675e

begin work on sampling API

This is motivated by the need to be able to sample with arbitrary feature data
(e.g. from a feature file) against a database, for the JNMR "collections" paper
revisions or possible ISMIR paper revisions.  That bit doesn't work yet, but
the C-ified version of the current functionality (sample db x db and
sample key x db) works to the level of anecdotal tests.

The general approach is to mirror the _query_spec() API, where a whole heap
of knobs and twiddles are available to the user.  Unlike in the _query_spec()
API, not quite all of the knobs make sense (and even fewer are actually
implemented), but the basic idea is the same.

I pity the poor chump who will have to document all this.

   free(adb->header);
   delete adb->keys;
   delete adb->keymap;
   delete adb->track_lengths;
   delete adb->track_offsets;
+  gsl_rng_free(adb->rng);
   if(adb->cached_lsh) {
     delete adb->cached_lsh;
   }
   divest_lock(adb->fd);
   close(adb->fd);