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