somDestruct Parameter - ctrl
ctrl (somDestructCtrl)
A pointer to a somDestructCtrl
data structure. SOMobjects uses this data structure to control the uninitialization
of the ancestor classes, thereby ensuring that no ancestor class receives
multiple uninitialization calls. If a user invokes somDestruct on
an object directly, a NULL (that is, zero) ctrl pointer can be passed. This
instructs the receiving code to obtain a somDestructCtrl data structure
from the class of the object.
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