//  (C) Copyright Jeremy Siek 2004 

//  Distributed under the Boost Software License, Version 1.0. (See

//  accompanying file LICENSE_1_0.txt or copy at

//  http://www.boost.org/LICENSE_1_0.txt)

#ifndef BOOST_QUEUE_HPP

#define BOOST_QUEUE_HPP

#include <deque>

#include <algorithm>

namespace boost {

template <class _Tp, 

          class _Sequence = std::deque<_Tp> >

class queue;

template <class _Tp, class _Seq>

inline bool operator==(const queue<_Tp, _Seq>&, const queue<_Tp, _Seq>&);

template <class _Tp, class _Seq>

inline bool operator<(const queue<_Tp, _Seq>&, const queue<_Tp, _Seq>&);

template <class _Tp, class _Sequence>

class queue {

#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS

  template <class _Tp1, class _Seq1>

  friend bool operator== (const queue<_Tp1, _Seq1>&,

                          const queue<_Tp1, _Seq1>&);

  template <class _Tp1, class _Seq1>

  friend bool operator< (const queue<_Tp1, _Seq1>&,

                         const queue<_Tp1, _Seq1>&);

#endif

public:

  typedef typename _Sequence::value_type      value_type;

  typedef typename _Sequence::size_type       size_type;

  typedef          _Sequence                  container_type;

  typedef typename _Sequence::reference       reference;

  typedef typename _Sequence::const_reference const_reference;

#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS

protected:

#endif

  _Sequence c;

public:

  queue() : c() {}

  explicit queue(const _Sequence& __c) : c(__c) {}

  bool empty() const { return c.empty(); }

  size_type size() const { return c.size(); }

  reference front() { return c.front(); }

  const_reference front() const { return c.front(); }

  reference top() { return c.front(); }

  const_reference top() const { return c.front(); }

  reference back() { return c.back(); }

  const_reference back() const { return c.back(); }

  void push(const value_type& __x) { c.push_back(__x); }

  void pop() { c.pop_front(); }

  void swap(queue& other)

  {

    using std::swap;

    swap(c, other.c);

  }

};

template <class _Tp, class _Sequence>

bool 

operator==(const queue<_Tp, _Sequence>& __x, const queue<_Tp, _Sequence>& __y)

{

  return __x.c == __y.c;

}

template <class _Tp, class _Sequence>

bool

operator<(const queue<_Tp, _Sequence>& __x, const queue<_Tp, _Sequence>& __y)

{

  return __x.c < __y.c;

}

template <class _Tp, class _Sequence>

bool

operator!=(const queue<_Tp, _Sequence>& __x, const queue<_Tp, _Sequence>& __y)

{

  return !(__x == __y);

}

template <class _Tp, class _Sequence>

bool 

operator>(const queue<_Tp, _Sequence>& __x, const queue<_Tp, _Sequence>& __y)

{

  return __y < __x;

}

template <class _Tp, class _Sequence>

bool 

operator<=(const queue<_Tp, _Sequence>& __x, const queue<_Tp, _Sequence>& __y)

{

  return !(__y < __x);

}

template <class _Tp, class _Sequence>

bool 

operator>=(const queue<_Tp, _Sequence>& __x, const queue<_Tp, _Sequence>& __y)

{

  return !(__x < __y);

}

template <class _Tp, class _Sequence>

inline void

swap(queue<_Tp, _Sequence>& __x, queue<_Tp, _Sequence>& __y)

{ __x.swap(__y); }

} /* namespace boost */

#endif /* BOOST_QUEUE_HPP */