Question

I ve been looking for documentation for cocos2d-x but it seems to be really really poor beyond the very basics. I understand that my own classes should inherit from CCObject to be able to use (originally cocoa s) retain/release mechanism, but I m still confused about what happens when you new something. init is not called automatically. is it OK to call it from inside the constructor? does that alone guarantee that my object will start with a reference count of 1? what is CC_SAFE_DELETE and when should I use it? do release and autorelease work exactly like in cocoa? what about CC_SYNTHESIZE? I just need to see a properly coded class example (and it s instantiation/destruction) to understand what I m supposed to do so as not to screw and leave memory leaks. thank you.

Answer 1

如果您要查看 CCObject 类的代码, 您可以看到其中的构建器引用计数设置为 1 。因此, 使用 < code> new 创建对象是正确的。 Init 不调用, 因为 CCObject 类没有这样的方法。通常我更喜欢使用静态构建器创建对象。 Smth like

MyClass* MyClass::createInstance()
{
    MyClass* object = new MyClass();

    // you can create virtual init method
    // and call it here

    if( initWasSuccessful )
    {
        object->autorelease();
    }
    else
    {
        CC_SAFE_RELEASE_NULL(object);
    }
    return object;
}

关于所有宏,比如 CC_SAFE_DELETE - 您可以在 cocos2dx 代码中找到它们。这个宏只是检查对象是否为 NULL 以防止在尝试调用释放方法时发生崩溃。

Answer 2

莫里昂的回答很好,我只想就这个问题补充几个有用的联系。

Here you can find the official memory management in Cocos2d-x page: Memory Management in Cocos2d-x

This forum page also contains some more details and clarifications about it: Memory deallocation in Cocos2d-x

玩得开心点!

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