C ++循环头依赖 [英] C++ cyclical header dependency

问题描述

我有一个问题：假设我有一个标题/源文件集和一个标题设置如下

I had a question: Supposed I have a header/source file set and a header set as follows"

BaseCharacter.h和BaseCharacter.cpp和EventTypes.h

BaseCharacter.h and BaseCharacter.cpp and EventTypes.h

BaseCharacter.h使用EventTypes.h中定义的struct和typedef，但EventTypes.h必须知道BaseCharacter.h中定义的BaseCharacter类，如果我取出EventTypes.h和所有依赖于EventTypes.h中的东西的方法，我的程序编译得很好，但是如果我添加了EventTypes.h ，它和引用BaseCharacter.h的每个文件都会抱怨它找不到BaseCharacter类。

BaseCharacter.h makes use of structs and typedefs defined in EventTypes.h, but EventTypes.h has to be aware of the BaseCharacter class defined in BaseCharacter.h. This creates a cyclical dependency and I'm pretty sure that's whats stopping my program from compiling. If I take out EventTypes.h and all the methods that rely on the stuff in EventTypes.h, my program compiles fine. But if I added EventTypes.h, it, and every file referencing BaseCharacter.h will complain that it can't find the BaseCharacter class.

有一个绕过这个依赖的方法，导致我的问题？

Is there a way around this dependency or would this not be what's causing my problem?

我使用MSVC 2010作为我的编译器

I'm using MSVC 2010 as my compiler

推荐答案

转发声明。

在EventTypes.h中，删除include并添加：

In EventTypes.h, remove the include and add:

class BaseCharacter; c>

请注意，你只能使用引用和指针 BaseCharacter 在EventTypes.h中，你不能eg有一个 BaseCharacter myChar; 成员变量的结构。

Note that you can only use references and pointers to BaseCharacter within EventTypes.h, you cannot e.g. have a struct with a BaseCharacter myChar; member variable.

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