function tells GEOM that geom
is to be destroyed.
GEOM sets an error on each provider of the given geom (in the
orphaning process) and waits for a chance to destroy the geom.
If the access count of any possessed consumer goes to 0, the consumer will be
detached and destroyed automatically.
If the last consumer attached to any possessed provider will be detached,
the provider will be destroyed.
If there are no more providers nor consumers, the geom will be
This is an automatic
to avoid duplicated code in all classes.
Before it is called, field
should be disposed of and set to
Note that the
function gives no guarantee that the geom will be immediately destroyed, mostly
because the access counts of the geom's consumers and providers may not be 0.
That is why calling this function for every geom from a given class is not enough
to be sure that the class can be unloaded.