cpp-lazy-stream/include/stream/for_each.h

//
//  for_each.h
//  stream
//
//  Created by Sam Jaffe on 3/29/23.
//

#pragma once

#define FWD(x) std::forward<decltype(x)>(x)

namespace stream::ranges {
template <typename S, typename F> void for_each(S && stream, F func) {
  for (auto && elem : FWD(stream)) {
    func(FWD(elem));
  }
}
}

namespace stream::ranges::views {
template <typename F> class for_each {
private:
  F operation_;

public:
  for_each(F operation) : operation_(operation) {}

  template <typename Stream>
  friend void operator|(Stream && stream, for_each const & each) {
    ranges::for_each(FWD(stream), each.operation_);
  }
};
}

#undef FWD