#include <istream>
#include <ostream>

class NaturalNumbers {
	char* name;
	unsigned nameLength;

	int* elements;
	unsigned elementsCount;
	unsigned elementsLength;

	void copyFrom(const NaturalNumbers& other);
	void free();
	void move(NaturalNumbers&& other);

	void resize();
	int indexOfNum(int number) const;

public:
	NaturalNumbers();
	NaturalNumbers(const int* elements, unsigned elementsCount, const char* name);

	~NaturalNumbers();
	NaturalNumbers(const NaturalNumbers& other);
	NaturalNumbers& operator=(const NaturalNumbers& other);

	bool operator[](int number) const;
	NaturalNumbers& operator+=(const NaturalNumbers& other);

	const int* get_elements() const;
	bool addElement(int number);
	unsigned get_elementsCount() const;

	const char* get_name() const;
	void set_name(const char* newName);
};

NaturalNumbers operator+(const NaturalNumbers& lhs, const NaturalNumbers& rhs);

std::ostream& operator<<(std::ostream& ostr, const NaturalNumbers& numbers);
std::istream& operator>>(std::istream& istr, NaturalNumbers& numbers);