Re: why this program can be compiled, but cannot be linked?

[Larry I Smith]

Andy wrote:
> Hi,
> 
> I just write a small  program on nested class. It can be compiled, but
> cannot be linked. How shall I solve this problem? The program is as
> follows:
> 
> #include <iostream>
> #include <string>
> using namespace std;
> 
> class A{
> public:

// declare the static member A::str
>   static string str;
> 
>   class B{
>     public:
>        void method(){  str = "assigned in class B"; }
>   };
> 
>   class B b;
> };
> 

// define static member A::str;
string A::str;


> int main()
> {
>   A a;
>   a.b.method();
>   cout<<"a.str = "<<A::str<<endl;
> }
> 
> Thanks a lot!
> 
> Andy
> 

See the changes above.

Regards,
Larry

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