Change num_blk to void_int in ex_get_truth_table()

[rrdrake]

The SNL SABLE code is adaptive block structured and big problems could contain more than 2.x billion element blocks.

I noticed in the exodus source that the ex_get_truth_table() and ex_put_truth_table() are using an int for the number of blocks. In other places, like ex_get_init(), a void_int* is used in order to allow for 64 bit integers, and int64_t is used for ex_put_init().

This is not an issue with ex_get_object_truth_vector() because it receives an ex_entity_id for the block id.

Is this a lingering 64 bit TODO thing, or is there a reason that an int is being used here?

[gsjaardema]

Did not expect a model to have over 2billion element blocks, so haven't checked that code path very thoroughly... Will take a look. Would be interesting to see what else breaks (internally and externally) with >2 billion blocks...

[rrdrake]

Truth is (no pun indented :) that in this use case, the results variables would be uniform across all blocks, so there would no need to store or get the truth table. Thus, I consider this Issue low priority. It is just a consistency thing.

[gsjaardema]

Yes, but there are many other areas in the code which would currently fail with >2 billion blocks.... I'm also not sure whether the underlying HDF5 or netCDF format would support this...

I've looked a little and found a few areas that would need fixing... Will create a branch that I can work on periodically. Not sure how soon you will need >2 billion blocks?