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#include <iterator>
struct BidirectionalIterator
{
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:
BidirectionalIterator(int init);
// standard:
bool operator==(BidirectionalIterator const &other) const;
bool operator!=(BidirectionalIterator const &other) const;
int &operator*();
BidirectionalIterator &operator++();
// required:
BidirectionalIterator &operator--();
// consider:
int *operator->();
};
BidirectionalIterator::BidirectionalIterator(int init)
:
d_value(init)
{}
bool BidirectionalIterator::operator!=(BidirectionalIterator const &other) const
{
return d_value != other.d_value;
}
bool BidirectionalIterator::operator==(BidirectionalIterator const &other) const
{
return d_value == other.d_value;
}
BidirectionalIterator &BidirectionalIterator::operator++()
{
return *this;
}
BidirectionalIterator &BidirectionalIterator::operator--()
{
return *this;
}
int &BidirectionalIterator::operator*()
{
return d_value;
}
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