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class base
{
public:
base(int& data_) : data(data) {}
void func() {++data; cout << &data << " " << data << endl;}
protected:
int& data;
}
int& a = a;
class base
{
public:
base(int& data) : data(data) {}
void func() {++data; cout << &data << " " << data << endl;}
protected:
int& data;
}