cpp-lazy-stream/include/stream/detail/adaptor.h

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

#pragma once

#include <stream/forward.h>

namespace stream::detail {
template <typename T, typename It = void> struct adaptor {
  using dereference_t = T (*)(void *);
  using equal_to_t = bool (*)(void *, void *);
  using increment_t = void (*)(void *);

  static dereference_t dereference() {
    return [](void * p) -> T { return **((It *)p); };
  }

  static equal_to_t equal_to() {
    return [](void * l, void * r) { return *((It *)l) == *((It *)r); };
  }

  static increment_t increment() {
    return [](void * p) { ++(*(It *)(p)); };
  }
};
}