cpp-lazy-stream/include/stream/algorithm/equal.h

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

#pragma once

#include <algorithm>

namespace stream::range {

template <typename It1, typename S1, typename It2, typename S2,
          typename Cmp = std::equal_to<>>
bool equal(It1 it1, S1 end1, It2 it2, S2 end2, Cmp cmp = {}) {
  for (; it1 != end1 && it2 != end2; ++it1, ++it2) {
    if (!std::invoke(cmp, *it1, *it2)) { return false; }
  }
  return (it1 != end1) == (it2 != end2);
}

template <typename S1, typename S2, typename Cmp = std::equal_to<>>
bool equal(S1 const s1, S2 const & s2, Cmp cmp = {}) {
  return equal(s1.begin(), s1.end(), s2.begin(), s2.end(), cmp);
}

}