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.

Note as an alternative to specifying a #pragma omit, it is possible to define macros which causes a particular type's descriptor definition to be ignored. For example

#define CLASSDESC_TYPENAME___Root
#define CLASSDESC_json_pack___Root

disables both the typeName definition and the json_pack defintion for the Root class. The exact form of the macro can be found by consulting the generated .cd files.

#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.