CoreFoundation 所有权遵循 CreateRule

Question

什么是“所有权遵循 CreateRule”。意味着在核心基础文档中？。

Return Value A new dictionary, or NULL if there was a problem creating the object. Ownership follows the Create Rule.

谢谢。

Answer 1

如果您创建一个对象，使用名称中带有Create 或Copy 的函数，您需要使用 CFRelease 释放它。如果您通过其他方式获得对象，则不必这样做。

与 Objective-c 中的便捷方法相同。

引自“核心基础设计概念”

There is an important distinction between Get, and Copy and Create, in names of functions that return values. If you use a Get function, you cannot be certain of the returned object’s life span. To ensure the persistence of such an object you can retain it (using the CFRetain function) or, in some cases, copy it. If you use a Copy or Create function, you are responsible for releasing the object (using the CFRelease function). For more details, see Memory Management Programming Guide for Core Foundation.