This class specializes ReferenceCount to add an additional counter, called node_ref_count, for the purposes of counting the number of times the object is referenced by a “node”, whatever that may mean in context.
The new methods
nodeUnref()automatically increment and decrement the primary reference count as well. There also exists a NodePointerTo<> class to maintain the node_ref counters automatically.
See also CachedTypedWritableReferenceCount, which is similar in principle, as well as NodeCachedReferenceCount, which combines both of these.
getNodeRefCount() → int¶
Returns the current reference count.
nodeRef() → None¶
Explicitly increments the node reference count and the normal reference count simultaneously.
nodeUnref() → bool¶
Explicitly decrements the node reference count and the normal reference count simultaneously.
The return value is true if the new reference count is nonzero, false if it is zero.
testRefCountIntegrity() → bool¶
Does some easy checks to make sure that the reference count isn’t completely bogus.
nodeUnrefOnly() → None¶
Decrements the node reference count without affecting the normal reference count. Intended to be called by derived classes only, presumably to reimplement