C++:概念循环包含问题

C++: Conceptual circular include problem(C++:概念循环包含问题)

问题描述

我正在为游戏引擎制作基于组件的实体系统.

I'm making a component based entity system for a game engine.

我有一个实体类，它必须包含组件基类标头才能定义组件数组private Component* components[123]

I have an entity class, which has to include the component base class header in order to define the array of components private Component* components[ 123 ]

然而，在组件基类中我必须定义一个private Entity* ownerEntity，因为组件知道它属于谁是至关重要的！

However, in the component base class I have to define a private Entity* ownerEntity, beacuse it is crucial that a component knows who it belongs to!

这导致 Entity.h 需要 Component.h，反之亦然 -> 循环引用

This results in Entity.h needing Component.h and vice-versa -> Circular reference

我该如何解决这个问题?

How can I solve this?

推荐答案

只要你的类只需要包含 pointers 或 references 到其他类，你可以跳过真正的包含文件并使用像 class Component; 这样的空前向声明.

As long as you only need your class to contain pointers or references to the other classes, you can skip the real include file and use an empty forward declaration like class Component;.

您将需要在源文件中完整包含您取消引用指针或使用引用来调用 Component 上的方法.

You will need the full include in the source file where you dereference the pointers or use the reference to call methods on Component.

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