Pair.h

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/* ========================================
 
  Copyright (C) 2024-2025, Amlal El Mahrouss, licensed under the Apache 2.0 license.
 
======================================== */
 
#pragma once
 
#include <CompilerKit/CompilerKit.h>
#include <NeKit/Config.h>
#include <NeKit/ErrorOr.h>
 
namespace Kernel {
template <typename T1, typename T2>
class Pair;
 
class PairBuilder;
 
template <typename T1, typename T2>
class Pair final {
  T1 fFirst{nullptr};
  T2 fSecond{nullptr};
 
  friend PairBuilder;
 
 public:
  explicit Pair() = default;
  ~Pair()         = default;
 
  NE_COPY_DEFAULT(Pair)
 
  T1& First() { return fFirst; }
  T2& Second() { return fSecond; }
 
  const T1& First() const { return *fFirst; }
  const T2& Second() const { return *fSecond; }
 
 private:
  Pair(T1 first, T2 second) : fFirst(first), fSecond(second) {}
};
 
class PairBuilder final {
  template <typename T1, typename T2>
  STATIC Pair<T1, T2> Construct(T1 first, T2 second) {
    return Pair(first, second);
  }
};
 
template <typename T1, typename T2>
using PairOr = ErrorOr<Pair<T1, T2>>;
}  // namespace Kernel