弱引用对象

int (ob)

如果 “ob” 是一个引用或者一个代理对象，则返回 true。

int PyWeakref_CheckRef(ob)

如果 “ob” 是一个引用，则返回 true。

int PyWeakref_CheckProxy(ob)

如果 “ob” 是一个代理对象，则返回 true。

Return value: New reference.

Return a weak reference object for the object ob. This will always return a new reference, but is not guaranteed to create a new object; an existing reference object may be returned. The second parameter, callback, can be a callable object that receives notification when ob is garbage collected; it should accept a single parameter, which will be the weak reference object itself. callback may also be or NULL. If ob is not a weakly-referencable object, or if callback is not callable, None, or NULL, this will return NULL and raise TypeError.

PyWeakref_NewProxy(PyObject **ob, *callback)

Return value: New reference.

Return a weak reference proxy object for the object ob. This will always return a new reference, but is not guaranteed to create a new object; an existing proxy object may be returned. The second parameter, callback, can be a callable object that receives notification when ob is garbage collected; it should accept a single parameter, which will be the weak reference object itself. callback may also be None or NULL. If ob is not a weakly-referencable object, or if callback is not callable, , or NULL, this will return NULL and raise TypeError.

PyWeakref_GetObject(PyObject **ref)

返回弱引用对象 ref 的被引用对象。如果被引用对象不再存在，则返回 Py_None。

注解

该函数返回被引用对象的一个借来的引用。这意味着除非你很清楚在你使用期间这个对象不可能被销毁，否则你应该始终对该对象调用 。

PyObject PyWeakref_GET_OBJECT( **ref)

Return value: Borrowed reference.

类似 PyWeakref_GetObject()，但实现为一个不做类型检查的宏。