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#ifndef POLYGON_HPP
#define POLYGON_HPP
class polygon
{
protected:
double side_length_;
public:
polygon() : side_length_(0)
{}
void set_side_length(double side_length)
{
side_length_ = side_length;
}
virtual double area() const = 0;
};
// the types of the class factories
typedef polygon* create_t();
typedef void destroy_t(polygon*);
#endif
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