# panda3d.core.ReferenceCount¶

from panda3d.core import ReferenceCount

class ReferenceCount

Bases: MemoryBase

A base class for all things that want to be reference-counted. ReferenceCount works in conjunction with PointerTo to automatically delete objects when the last pointer to them goes away.

Inheritance diagram

static getClassType() → TypeHandle
Return type

TypeHandle

getRefCount() → int

Returns the current reference count.

ref() → None

Explicitly increments the reference count. User code should avoid using ref() and un:meth:~ReferenceCount.ref directly, which can result in missed reference counts. Instead, let a PointerTo object manage the reference counting automatically.

This function is const, even though it changes the object, because generally fiddling with an object’s reference count isn’t considered part of fiddling with the object. An object might be const in other ways, but we still need to accurately count the number of references to it.

property ref_count

The current reference count.

Returns the current reference count.

Return type

int

testRefCountIntegrity() → bool

Does some easy checks to make sure that the reference count isn’t completely bogus. Returns true if ok, false otherwise.

testRefCountNonzero() → bool

Does some easy checks to make sure that the reference count isn’t zero, or completely bogus. Returns true if ok, false otherwise.

unref() → bool

Explicitly decrements the reference count. Note that the object will not be implicitly deleted by unref() simply because the reference count drops to zero. (Having a member function delete itself is problematic.) However, see the helper function unref_delete().

User code should avoid using ref() and un:meth:~ReferenceCount.ref directly, which can result in missed reference counts. Instead, let a PointerTo object manage the reference counting automatically.

This function is const, even though it changes the object, because generally fiddling with an object’s reference count isn’t considered part of fiddling with the object. An object might be const in other ways, but we still need to accurately count the number of references to it.

The return value is true if the new reference count is nonzero, false if it is zero.