from panda3d.core import CachedTypedWritableReferenceCount
This is a special extension to
ReferenceCountthat includes dual reference counts: the standard reference count number, which includes all references to the object, and a separate number (the cache reference count) that counts the number of references to the object just within its cache alone. When get_ref_count() ==
getCacheRefCount(), the object is not referenced outside the cache.
The cache refs must be explicitly maintained; there is no PointerTo<> class to maintain the cache reference counts automatically. The cache reference count is automatically included in the overall reference count: calling
cacheUnref()automatically calls ref() and unref().
cacheRef() → None¶
Explicitly increments the cache reference count and the normal reference count simultaneously.
cacheUnref() → bool¶
Explicitly decrements the cache 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.