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Cactus Code Thorn SpaceMask
Authors : Tom Goodale
CVS info : $Header$
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Purpose of the thorn:
This will provide two integer grid functions
space_mask
space_table_field
the first one will be a bitmask describing the point, with one bit
indicating that there is extra data in a table the handle of which can be
found in the corresponding point in the space_table_field.
Thorns interested in the mask should inherit from this implementation.
There may also be aliased query functions provided.
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