#include <iostream>
 
class Base
{
public:
 
	typedef int func_t (int x);
 
	virtual func_t function = 0;
 
    virtual int function2(int x) = 0;
};
 
class Derived : public Base
{
public:
    func_t function;
    int function2 (int x);
};
 
int Derived::function(int x)
{
	return x;
}
 
int Derived::function2(int x)
{
    return x;
}
 
int main()
{
	Base * theClass = new Derived();
 
	std::cout << theClass->function(1) << std::endl;
	std::cout << theClass->function2(2) << std::endl;
 
	delete theClass;
 
	return 0;
}

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