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