[CppAD] **tape_id++

[bradbell at seanet.com]

CppAD does not re-use thread_id values because it identifies variables as
AD<double> values that have the same tape identifier as the current
AD<double> tape.

As soon as the tape stops recording, its variables become parameters
without having to manage a linked list from the tape to its not yet
destructed variables.

The simplest solution would be if size_t on your machine is larger than
unsigned int. In that case you could use the configure argument
      TAPE_ID_TYPE=tape_id_type
to change the tape id type; see
       http://www.coin-or.org/CppAD/Doc/installunix.xml#tape_id_type

Another possible solution is to use a small value for the configure argument
     MAX_NUM_THREADS=max_num_threads
(this is the amount that the tape id is incremented each time); see
     http://www.coin-or.org/CppAD/Doc/installunix.xml#max_num_threads
also see
     http://www.coin-or.org/Cpp/Doc/multi_thread.xml#CPPAD_MAX_NUM_THREADS


> Hi,
>
> I just noticed that CppAD increments **tape_id every time I create a new
> tape. That's a good thing, except I'm running out of unsigned ints. Is
> there a safe way to reset the **tape_id periodically? (Note that I'm not
> running out of memory, just unsigned ints...)
>
> Thanks,
> Jason
>
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