c++，多继承造成的二义性及解决办法

#include <iostream>
using namespace std;
//-------------------------------
class A1{
public:
    int a;
public:
    void m();
};

void A1::m() {
    cout<<"A1::m():a="<<this->a<<endl;
}

//-------------------------------
class A2 {
public:
    int a;
    void m();
};

void A2::m() {
    cout<<"A2::m(),a="<<this->a<<endl;
}

//-------------------------------
class B :public A1, public A2{
public:
    void show();
};

void B::show()
{
    cout<<"A1::a="<<this->A1::a<<endl;
    cout<<"A2::a="<<this->A2::a<<endl;
}

//-------------------------------
void f1() {
    B b;    
    b.A1::a = 34;
    b.A2::a = 32432;
    
    b.A1::m();//这时不能用b.m()，具有歧义；
    b.A2::m();//用格式 b.A1::m(), b.A2::m()明确对象,消除歧义
    b.show();
}
int main() {
    f1();
    while(1);
    return 0;
}
/*测试结果：

A1::m():a=34
A2::m(),a=32432
A1::a=34
A2::a=32432

*/