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#include <iostream>
 
class Base1
{
public:
    void doit()
    {
	}
};
 
class Base2
{
	void doit(int x)
	{
	}
};
 
class Derrived : public Base1, public Base2
{
};
 
using namespace std;
 
int main()
{
   cout << "Hello World" << endl;
   Derrived d;
   d.doit(); // doesn't work - error: request for member ‘doit’ is ambiguous
   d.::Base1::doit(); //works
   return 0;
}
 

prog.cpp: In function ‘int main()’:
prog.cpp:28:6: error: request for member ‘doit’ is ambiguous
    d.doit(); // doesn't work - error: request for member ‘doit’ is ambiguous
      ^
prog.cpp:13:7: note: candidates are: void Base2::doit(int)
  void doit(int x)
       ^
prog.cpp:6:10: note:                 void Base1::doit()
     void doit()
          ^

Standard output is empty