c++ - Enumeration access in different class -

i have enumeraion in class , class b have class instance member. how can access class enumeraion in class b using instance

class a{    enum ab{    1,    b 2 }; } 

in class b need enumeraion

#include <iostream> using namespace std;  class a{    public:    enum ab{    a= 1,    b= 2 }; };  class b{     public:     void test()     {         enum a::ab x=a::a;         cout << "test a::a = " << x << endl;         x=a::b;         cout << "test a::b = " << x << endl;     } };  int main() {     cout << "a::a = " << a::a << endl;     cout << "a::b = " << a::b << endl;     class b b;     b.test(); } 

the enumerated names a,b reside in class namespace so, can access them using a:: prefix a::a.