Regular problem which comes from multiple inheritance

MultipleIneritance.cpp

#include <iostream>
#include <stdio.h>

class L
{
private:
    int a1=1;
public:
    L():a1(2), a2(a1)  //Don't use like this, a2 result depends on compiler
    {}
    ~L()
    { }
    int a2=1;
};

class B1 : /*virtual*/ public L
{
private:
    int b1=1;

public:
    B1():b1(3), b2(b1) //Don't use like this, a2 result depends on compiler
    { }
    ~B1()
    { }
    int b2=1;
    int comm=0;
};

class B2 : /*virtual*/ public L
{
private:
    int c1=1;
    
public:
    B2():c1(4), c2(c1)
    {
        printf("C created\n");
    };
    ~B2()
    {
        c1=0;
        printf("C deleted\n");
    }

    int c2=1;
    int comm=0;
};

class D  : public B1, public B2
{
private:
    int d=1;
public:
    D()
    { }
    ~D()
    { }
};

int main(int argc, const char * argv[])
{
    D *D1 = new D();
    //D1->aClass::a2=2;  //Ambiguous base class, it could using virtual in B1 and B2 when they inheritance from L
    
    //D1->comm=1;        //comm exist in multiple base case, ambiguous base case
    D1->B1::comm =5;     //It will work because it specific which variable using by :: (resolution operator)
    return 0;
}