#include"iostream.h"
class base{
public:
    int lby;
};

class base1:public base{};
class base2:public base{};
class b12:public base1,public base2{};
class b22:public base1,public base2{};
class kk:public b12,public b22{};
//*******************************************************
main()
{
kk bbb;
}
我想通过对象bbb修改bbb.b22.base2.base.lby=1999;怎样写表达式？

bbb.b22::base2::lby = 1999;
这样的表达式无法通过编译啊！！！！！

     我想说的意思的是对于多重公用继承，怎样访问任意深度的基类，当然没有同名的很好访问，但对于上面问题同名情况如何表达，我本意不想用虑基类只产生一个拷贝。就相写出形如：bbb.b22.base2.base.lby=1999或bbb.b12.base2.base.lby=2000这样的访问形式，如不能解决则公有继承的公有成员怎样实现任意访问？

对不起我用VC6。0调试通不过我没有VC2012

Compiling...
mm.cpp
d:\program files\microsoft visual studio\myprojects\mb\mm.cpp(42) : error C2039: 'base2' : is not a member of 'b22'
        d:\program files\microsoft visual studio\myprojects\mb\mm.cpp(36) : see declaration of 'b22'
d:\program files\microsoft visual studio\myprojects\mb\mm.cpp(42) : error C2385: 'kk::lby' is ambiguous
d:\program files\microsoft visual studio\myprojects\mb\mm.cpp(42) : warning C4385: could be the 'lby' in base 'base' of base 'base1' of base 'b12' of class 'kk'
d:\program files\microsoft visual studio\myprojects\mb\mm.cpp(42) : warning C4385: or the 'lby' in base 'base' of base 'base2' of base 'b12' of class 'kk'
d:\program files\microsoft visual studio\myprojects\mb\mm.cpp(42) : warning C4385: or the 'lby' in base 'base' of base 'base1' of base 'b22' of class 'kk'
d:\program files\microsoft visual studio\myprojects\mb\mm.cpp(42) : warning C4385: or the 'lby' in base 'base' of base 'base2' of base 'b22' of class 'kk'
d:\program files\microsoft visual studio\myprojects\mb\mm.cpp(44) : error C2039: 'base2' : is not a member of 'b22'
        d:\program files\microsoft visual studio\myprojects\mb\mm.cpp(36) : see declaration of 'b22'
d:\program files\microsoft visual studio\myprojects\mb\mm.cpp(44) : error C2385: 'kk::lby' is ambiguous
d:\program files\microsoft visual studio\myprojects\mb\mm.cpp(44) : warning C4385: could be the 'lby' in base 'base' of base 'base1' of base 'b12' of class 'kk'
d:\program files\microsoft visual studio\myprojects\mb\mm.cpp(44) : warning C4385: or the 'lby' in base 'base' of base 'base2' of base 'b12' of class 'kk'
d:\program files\microsoft visual studio\myprojects\mb\mm.cpp(44) : warning C4385: or the 'lby' in base 'base' of base 'base1' of base 'b22' of class 'kk'
d:\program files\microsoft visual studio\myprojects\mb\mm.cpp(44) : warning C4385: or the 'lby' in base 'base' of base 'base2' of base 'b22' of class 'kk'
执行 cl.exe 时出错.

mm.obj - 1 error(s), 0 warning(s)
我的不行，不知为何？？

上面就是复制的结果，并且如果删去
// bbb.b22::base2::lby = 1999;
    // 或
    //bbb.b22::base2::base::lby = 1999;
这两句就能编译通过，难道是我的编译器有问题。

对了，对于二重深度的访问，形如。A.BB1::F(),A.BB2::F()这样的表达式是没有问题的。但是再写下去三重深度
A.BB1::CCC1::F()这样类型的表达式的形式就不行了。