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

//
//  iota_iterator.h
//  stream
//
//  Created by Sam Jaffe on 4/6/23.
//

#pragma once

#include <iterator/facade.h>

#include <stream/forward.h>

namespace stream::ranges {

template <typename T, typename Bound>
class iota_iterator
    : public facade<iota_iterator<T, Bound>, iterator::category::forward> {
public:
  using sentinal_type = Bound;

  iota_iterator() = default;
  iota_iterator(T value, Bound bound) : value_(value), bound_(bound) {}

  T dereference() const { return value_; }
  void increment() { ++value_; }
  bool at_end() const { return value_ == bound_; }
  // Some weird bug in dependent template instantiation???
  bool equal_to(iota_iterator const & other) const {
    return value_ == other.value_;
  }
  std::ptrdiff_t distance_to(iota_iterator const & other) const {
    return other.value_ - value_;
  }

private:
  T value_;
  Bound bound_;
};

}