C ++如何包含(循环依赖)? [英] c++ how to include (circular dependency)?

问题描述

我有Environment.h文件:

I have Environment.h file:

#include <windows.h>
#include "interfaces.h"

#ifndef ENVIRONMENT_H
#define ENVIRONMENT_H

class Environment {};
#endif

我有Interfaces.h文件:

and i have Interfaces.h file:

#ifndef INTERFACES_H
#define INTERFACES_H

class IMoving {
    public: 
        virtual void Move() = 0;          
};

#endif

在IMoving接口中，我想获取一个Environment类，以了解如何移动

in interface IMoving i would like to get an Environment class, to know how to move

class IMoving {
    public: 
        virtual void Move(Environment*) = 0;          
};

如果要执行此操作，则需要添加环境.h

if i want to do this i need to include environment.h

#include "Environment.h"

在这里我遇到了一个错误，因为Environment.h-包括Interfaces.h和Interfaces.h-包括Environtment.h.那么如何使其工作呢?

and here i'm getting an error, becouse Environment.h - includes Interfaces.h and Interfaces.h - includes Environtment.h. So how to make it work ?

很抱歉拼写错误

推荐答案

对于循环依赖一个可以使用转发声明

For circular dependencies one can use Forward declaration(s)

在接口定义上方的Interfaces.h中，按如下所示向前声明 Environment :

In Interfaces.h just above interface definition, forward declare Environment as follows:

class Environment;

然后，当您在一个类中实现IMoving时，您将在其实现文件中包含Environment.h.

Then when you implement IMoving in a class, you will include Environment.h in its implementation file.

您可以在此处了解更多信息.

You can read more about Forward declaration here.

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