Data over a disjoint union of rectangles
LevelData is-a BoxLayoutData. It is built from a DisjointBoxLayout instead though, thus making the data in a DisjointBoxLayout uniquely defined for all spatial indices defined by the underlying DisjointBoxLayout. It carries within it an inherent concept of ghost cells (which the user can choose to be empty).Since LevelData is-a BoxLayoutData, all the methods required of the template class T for BoxLayoutData are also required for LevelData. LevelData does not have any extra requirements.
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