implementation_details.rst

Implementation details

Policy-based design

Handling the combinatorial explosion of features; avoid paying for what we don't need

• SizePolicy, StridePolicy, OffsetPolicy (compile time vs. runtime)
• IndirectionPolicy (none, C-array, std::vector, custom, e.g. mfem::Array)
• SubsettingPolicy (none, virtual parent, concrete parent)
• OwnershipPolicy (local, sidre, other repository)

Feature diagram of OrderedSet policies (subset).

The figure shows how certain these policies interact with the subscript operator.

Simplifying mesh setup

• Builder classes

  • Chained initialization using named-parameter idiom

• Generator classes to simplify types