Keywords: classdesc

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## supported #pragmas

#pragma omit action typename
  Do not emit a definition of action for this type. It is up to the programmer to supply a definition for this type. The typename needs to be fully qualified with its namespaces.
#pragma treenode typename
  Asserts that pointers to this type refer to a single object or are `NULL`, and that following the links from this object will not return to the same object (no cycles). True of trees, and of limited validity with directed acyclic graphs.
#pragma graphnode typename
  As above, except that the graph is allowed to contain cycles. It generally requires more expensive algorithms to traverse a general graph than to traverse a tree.