Pair.h

/*
 * Copyright (c) 2008-2014, Pedigree Developers
 *
 * Please see the CONTRIB file in the root of the source tree for a full
 * list of contributors.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 
#ifndef KERNEL_UTILITIES_PAIR_H
#define KERNEL_UTILITIES_PAIR_H
 
#include "pedigree/kernel/processor/types.h"
#include "pedigree/kernel/utilities/template.h"
 
template <class T1, class T2>
class Pair {
 public:
  Pair() : m_First(), m_Second() {}
  Pair(const T1& a, const T2& b) {
    m_First = a;
    m_Second = b;
  }
 
  const T1& first() const {
    return m_First;
  }
 
  const T2& second() const {
    return m_Second;
  }
 
 private:
  T1 m_First;
  T2 m_Second;
};
 
template <class T1, class T2>
bool operator==(const Pair<T1, T2>& left, const Pair<T1, T2>& right) {
  return (left.first() == right.first()) && (left.second() == right.second());
}
 
template <class T1, class T2>
bool operator!=(const Pair<T1, T2>& left, const Pair<T1, T2>& right) {
  return (left.first() != right.first()) || (left.second() != right.second());
}
 
template <class T1, class T2>
bool operator<(const Pair<T1, T2>& left, const Pair<T1, T2>& right) {
  if (left.first() < right.first()) {
    return true;
  } else if (right.first() < left.first()) {
    return false;
  }
 
  return left.second() < right.second();
}
 
template <class T1, class T2>
bool operator<=(const Pair<T1, T2>& left, const Pair<T1, T2>& right) {
  return !(right < left);
}
 
template <class T1, class T2>
bool operator>(const Pair<T1, T2>& left, const Pair<T1, T2>& right) {
  return right < left;
}
 
template <class T1, class T2>
bool operator>=(const Pair<T1, T2>& left, const Pair<T1, T2>& right) {
  return !(left < right);
}
 
template <typename T1, typename T2>
Pair<T1, T2> makePair(T1 a, T2 b) {
  return Pair<T1, T2>(a, b);
}
 
#endif