类在名称空间错误中不存在 [英] class does not exist in namespace error

问题描述

我有以下课程
以下代码在Nurse.h
中定义

Hi,
I have following classes
following code is defined in nurse.h

#pragma once
#include "shift.h"
namespace Manage{
	private ref class nurse
	{
List<shift^> ^_daysServedlst;//here comes the error that shift is not defined in Manage Though it is available in auto complete list
...
};
}

以下代码块在shift.h
中定义

the following code block is defined in shift.h

#pragma once
#include "nurse.h"
namespace Manage
{
	using namespace System;
	using namespace System ::Collections ::Generic ;
	
 private ref class shift : IComparable
	{
};

问题是当我尝试在护士类的任何函数中创建shift类的对象时发生编译错误
错误消息错误C2039:"shift":不是"Manage"的成员
请帮助

the problem is the compilation error occurs when I try to make an object of shift class in any function of nurse class
Error message error C2039: ''shift'' : is not a member of ''Manage''
Please help

推荐答案

停止交叉包含头文件，您会很好的.例如，将声明放在一个头文件中.

您还需要转发类声明.例如:

Stop cross-include of your header files and you will be fine. Put the declarations in one header file, for example.

You also need forward class declaration. For example:

ref class BBB;
public ref class AAA {
    BBB^ bbb;
    //...
};

public ref class BBB {
    AAA^ aaa;
    //...
};

如果您不使用按值语义的实例的类引用，将是不可能的，这有明显的原因:由于无限的构造函数递归，实例化将导致无限的构造.

—SA

It won''t be possible if you used not class references by the instances in by-value semantic, by obvious reasons: instantiation would cause infinite construction due to infinite constructor recursion.

—SA

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