json-validator/include/jvalidate/detail/array_iterator.h

#pragma once

#include <cstddef>
#include <iterator>

#include <jvalidate/detail/deref_proxy.h>

namespace jvalidate::adapter::detail {
/**
 * @brief An iterator for binding JSON values of type Array - which are
 * congruent to a vector<JSON>.
 *
 * @tparam It The underlying iterator type being operated on
 * @tparam Adapter The owning adapter type, must fulfill the following
 * contracts:
 *    - is constructible from the value_type of It
 * Additionally, Adapter is expected to conform to the jvalidate::Adapter
 * concept.
 */
template <typename It, typename Adapter> class JsonArrayIterator : public It {
public:
  using value_type = Adapter;
  using reference = Adapter;
  using pointer = ::jvalidate::detail::DerefProxy<reference>;
  using difference_type = ptrdiff_t;
  using iterator_category = std::forward_iterator_tag;

  JsonArrayIterator() = default; // Sentinel for handling null objects
  explicit(false) JsonArrayIterator(It const & it) : It(it) {}

  reference operator*() const { return Adapter(It::operator*()); }

  pointer operator->() const { return {operator*()}; }

  JsonArrayIterator operator++(int) {
    auto tmp = *this;
    ++*this;
    return tmp;
  }

  JsonArrayIterator & operator++() {
    It::operator++();
    return *this;
  }
};
}