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#include <iterator>
struct RandomIterator
{
using iterator_category = std::bidirectional_iterator_tag;
using difference_type = std::ptrdiff_t;
using value_type = int;
using pointer = value_type *;
using reference = value_type &;
private:
int d_value;
public:
RandomIterator(int init);
bool operator==(RandomIterator const &other) const;
int operator-(RandomIterator const &rhs) const;
RandomIterator operator+(int step) const;
RandomIterator &operator--()
int &operator*();
int *operator->() const;
bool operator<(RandomIterator const &other) const;
RandomIterator operator--(int);
RandomIterator &operator++();
RandomIterator operator++(int);
RandomIterator operator-(int step) const;
RandomIterator &operator-=(int step);
RandomIterator &operator+=(int step);
};
RandomIterator::RandomIterator(int init)
:
d_value(init)
{}
bool RandomIterator::operator!=(RandomIterator const &other) const
{
return d_value != other.d_value;
}
int RandomIterator::operator-(RandomIterator const &rhs) const
{
return 0;
}
RandomIterator &RandomIterator::operator--()
{
return *this;
}
int &RandomIterator::operator*()
{
return d_value;
}
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