弱引用对象 ¶

Python supports weak references as first-class objects. There are two specific object types which directly implement weak references. The first is a simple reference object, and the second acts as a proxy for the original object as much as it can.

int PyWeakref_Check ( ob ) ¶

返回 True 若 ob is either a reference or proxy object. This function always succeeds.

int PyWeakref_CheckRef ( ob ) ¶

返回 True 若 ob is a reference object. This function always succeeds.

int PyWeakref_CheckProxy ( ob ) ¶

返回 True 若 ob is a proxy object. This function always succeeds.

PyObject * PyWeakref_NewRef ( PyObject * ob , PyObject * callback ) ¶

返回值：新引用。 属于 稳定 ABI (应用程序二进制接口) .

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 还可以为 None or NULL 。若 ob is not a weakly referencable object, or if callback is not callable, None ，或 NULL , this will return NULL and raise TypeError .

PyObject * PyWeakref_NewProxy ( PyObject * ob , PyObject * callback ) ¶

返回值：新引用。 属于 稳定 ABI (应用程序二进制接口) .

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 还可以为 None or NULL 。若 ob is not a weakly referencable object, or if callback is not callable, None ，或 NULL , this will return NULL and raise TypeError .

PyObject * PyWeakref_GetObject ( PyObject * ref ) ¶

返回值：借位引用。 属于 稳定 ABI (应用程序二进制接口) .

Return the referenced object from a weak reference, ref . If the referent is no longer live, returns Py_None .

注意

This function returns a 借位引用 to the referenced object. This means that you should always call Py_INCREF() on the object except when it cannot be destroyed before the last usage of the borrowed reference.

PyObject * PyWeakref_GET_OBJECT ( PyObject * ref ) ¶

返回值：借位引用。

类似于 PyWeakref_GetObject() , but does no error checking.

上一话题

内存视图对象

下一话题

胶囊

本页

• 报告 Bug
• 展示源