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Problem with multiple inheritance

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Hi everybody, I have a problem, where a class is derived from 2 base classes which have the same base classes, like in this example:
class BaseClass
{
protected:
  int base_var;
};

class ClassA : public BaseClass
{
protected:
  int a_var;
};

class ClassB : public BaseClass
{
protected:
  int b_var;
};

class LastClass: public ClassA,ClassB
{
public:
  void DoSomething()
  {
    int my_var=base_var;
  }
};

The problem occures when I want to get access to variable of the lowest base class (as in the "int my_var=base_var;" line). The is, what g++ gives me: g++ test2.cc test2.cc: In member function `void LastClass::DoSomething()': test2.cc:24: error: request for member `base_var' is ambiguous in multiple inheritance lattice test2.cc:4: error: candidates are: int BaseClass::base_var test2.cc:4: error: int BaseClass::base_var How can I do it? Thanks!

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try : virtual public BaseClass

see whats happened is A and B both have their own BaseClass. By declaring it virtual, they share the same base class.

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