Multiple class inheritance? - c++

Question

Based on the figure below, I wrote my code.
This is the code I wrote:
#include<iostream>
#include<string>
using namespace std;
class person
{
private:
int code;
string name;
public:
void setCode(int c) { code=c; }
int getCode() { return code; }
void setName(string s) { name=s; }
string getName() { return name; }
};
class account : public person
{
private:
double pay;
public:
void setPay(double p) { pay=p; }
double getPay() { return pay; }
};
class admin : public person
{
private:
string experience;
public:
void setExper(string e) { experience=e; }
string getExper() { return experience; }
};
class master : public account, public admin
{
};
int main()
{
master mastObj;// create master object.
mastObj.setName("John");
system("pause");//to pause console screen, remove it if u r in linux
return 0;
}
The compiler showed these errors:
Error 1 error C2385: ambiguous access of 'setName'
Error 2 error C3861: 'setName': identifier not found
Error 3 IntelliSense: "master::setName" is ambiguous

Answer 1

It is classic example of Diamond Problem in C++ when you use multiple inheritance.
The solution is : Virtual inheritance
That is, you should do this:
class account : public virtual person
{ //^^^^^^^note this
//code
};
class admin : public virtual person
{ //^^^^^^^note this
//code
};
I just found really good posts on this site, so I would redirect you to those answers here:
Virtual inheritance in C++
Virtual Inheritance Confusion
Virtual inheritance in C++
In C++, what is a virtual base class?
which also means, this topic should be voted for close.

Answer 2

You need virtual inheritance:
class account: public virtual person{
....
}
class admin: public virtual person{
...
}
PS And your pay, code fields lack initialization! This could lead to embarassing errors (like paying the cleaner several million of dollars :)):
#include<iostream>
#include<string>
using namespace std;
class person
{
// ...
person() : code(0), name("anonymous") {}
};
class account : public virtual person
{
// ...
account() : pay(0) {}
};
class admin : public virtual person
{
// ...
admin() : experience("unknown") {}
};

Answer 3

you may use mastObj.master::admin::person::setName("John");