#ifndef OPTIONAL_H
#define OPTIONAL_H
#include <stdexcept>

class invalid_optional_access: public std::runtime_error
{
    using runtime_error::runtime_error;
};

class  Optional_Integer
{
public:
    Optional_Integer(int i);
    Optional_Integer(Optional_Integer const&);
    ~Optional_Integer();
    Optional_Integer() = default;
    Optional_Integer & operator=(int);
    Optional_Integer & operator=(Optional_Integer const &);

    int & operator*() noexcept;
    int & value();

    bool has_value() const noexcept;
    void reset();

    void swap(Optional_Integer &);

private:
    int* data {};
};
#endif