这个报错是什么意思

[li4c]

/*************************************************************************
    > File Name: cthread.cpp
    > Author: Jukay
    > Mail: [e-mail] 
    > Created Time: 2014年10月27日 星期一 16时24分41秒
 ************************************************************************/

#include<iostream>
#include<string>
using namespace std;

class CBase
{
	public:
		string id;
};

class CDeriva1 : public CBase
{
	public:
		void show1()
		{
			cout<< "CDerival: " << id << endl;
		}
};

class CDeriva2 : public CBase
{
	public:
		void show2()
		{
			cout<< "CDerival2: " << id << endl;
		}
};

class CSon : public CDeriva2, public CDeriva1 {}


int main()
{
	CSon s;
	s.CDeriva1::id = "wd8503026";
	s.CDeriva2::id = "wd8503027";
	s.CBase::id = "wd8503025";
	s.show1();
	s.show2();
	cout<< "BASE: " << s.CBase::id << endl;

	return 0;
}

下面没是报错信息

请按 ENTER 或其它命令继续
cthread.cpp: In function ‘int main()’:
cthread.cpp:44:11: error: ‘CBase’ is an ambiguous base of ‘CSon’
  s.CBase::id = "wd8503025";
           ^
cthread.cpp:47:30: error: ‘CBase’ is an ambiguous base of ‘CSon’
  cout<< "BASE: " << s.CBase::id << endl;
                              ^

Shell 已返回1

[幻夢之葉]

CDeriva1 和CDeriva2 使用虚继承可解决你的错误！ 因为继承的时候都各自有一个CBase::id的副本，CSon分不清应该使用哪一个 所以需要使用虚继承来使其只有一个副本！ class CDeriva1 : virtual public CBase

[li4c]

引用 1 楼 jianwen0529 的回复:

CDeriva1 和CDeriva2 使用虚继承可解决你的错误！ 因为继承的时候都各自有一个CBase::id的副本，CSon分不清应该使用哪一个 所以需要使用虚继承来使其只有一个副本！ class CDeriva1 : virtual public CBase

按照你说的，改了还是报错啊

请按 ENTER 或其它命令继续
cthread.cpp:28:1: error: expected class-name before ‘{’ token
 {
 ^
cthread.cpp: In member function ‘void CDeriva2::show2()’:
cthread.cpp:32:28: error: ‘id’ was not declared in this scope
    cout<< "CDerival2: " << id << endl;
                            ^
cthread.cpp: In function ‘int main()’:
cthread.cpp:43:14: error: ‘class CDeriva2’ has no member named ‘id’
  s.CDeriva2::id = "wd8503027";
              ^

Shell 已返回1

[幻夢之葉]

#include<iostream>
#include<string>
using namespace std;

class CBase
{
	public:
		string id;
};

class CDeriva1 : virtual public CBase /*virtual  */
{
	public:
		void show1()
		{
			cout<< "CDerival: " << id << endl;
		}
};

class CDeriva2 : virtual public CBase  /*virtual  */
{
	public:
		void show2()
		{
			cout<< "CDerival2: " << id << endl;
		}
};

class CSon : public CDeriva2, public CDeriva1 {}; /* ; */


int main()
{
	CSon s;
	s.CDeriva1::id = "wd8503026";
	s.CDeriva2::id = "wd8503027";
	s.CBase::id = "wd8503025";
	s.show1();
	s.show2();
	cout<< "BASE: " << s.CBase::id << endl;

	return 0;
}