cpp-lazy-stream/include/stream/iterator/common_iterator.h

//
//  common_iterator.h
//  stream
//
//  Created by Sam Jaffe on 4/2/23.
//

#pragma once

#include <iterator/proxy.h>

#include <stream/forward.h>

namespace stream::ranges {
template <typename It, typename S>
class common_iterator : public proxy<It, common_iterator<It, S>> {
public:
  static_assert(!std::is_same_v<It, S>, "cannot operator on common types");
  using super_t = proxy<It, common_iterator<It, S>>;
  using sentinel_type = common_iterator;

public:
  using super_t::super_t;
  common_iterator(S) : super_t() {}

  bool equal_to(common_iterator const & other) const {
    return (at_end() && other.at_end()) || super_t::impl() == other.impl();
  }
  bool at_end() const { return super_t::impl() == S(); }
};
}

MAKE_ITERATOR_FACADE_TYPEDEFS_T(stream::ranges::common_iterator);