Pointer-map into core Octave?

[Olaf Till]

Hi,

I wonder if this should go into Octave ... a map of pointers,
referenced by external keys. Such a thing was mentioned by jwe
(https://mailman.cae.wisc.edu/pipermail/octave-maintainers/2008-November/013314.html)
in the context of Comedi support, but I don't think it is already
implemented (?). Storing pointers to allocated objects could be useful
for several things (comedi support, database connections, ...).

Some working example code is attached.

- organized similar to the database of open files in Octaves
  src/oct-stream.cc,

- avoids linear lookups by keeping track of "holes" in the list of
  external keys,

- not templated, but only for storing (void *), users have to typecast
  their objects; means that different types of objects may use a
  common pool of keys (integers), but I think this is o.k.

I would try to integrate this into Octave, if it is thought worth.

Olaf

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ptrmap.cc
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ptrmap.h
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test.cc
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