// -*- C++ -*-
/***************************************************************************
 *
 * <vector> - dfefinition of the C++ Standard Library vector class template
 *
 * $Id$
 *
 ***************************************************************************
 *
 * Licensed to the Apache Software  Foundation (ASF) under one or more
 * contributor  license agreements.  See  the NOTICE  file distributed
 * with  this  work  for  additional information  regarding  copyright
 * ownership.   The ASF  licenses this  file to  you under  the Apache
 * License, Version  2.0 (the  "License"); you may  not use  this file
 * except in  compliance with the License.   You may obtain  a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the  License is distributed on an  "AS IS" BASIS,
 * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY  KIND, either  express or
 * implied.   See  the License  for  the  specific language  governing
 * permissions and limitations under the License.
 *
 * Copyright 1994-2007 Rogue Wave Software, Inc.
 *
 ***************************************************************************
 *
 * Copyright (c) 1994
 * Hewlett-Packard Company
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Hewlett-Packard Company makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 **************************************************************************/

#ifndef _RWSTD_VECTOR_INCLUDED
#define _RWSTD_VECTOR_INCLUDED


#include <rw/_algobase.h>
#include <rw/_allocator.h>
#include <rw/_error.h>
#include <rw/_iterator.h>
#include <rw/_select.h>
#include <rw/_defs.h>


_RWSTD_NAMESPACE (std) {

_EXPORT
template <class _TypeT, class _Allocator = allocator<_TypeT> >
class vector;


_EXPORT
template <class _TypeT, class _Allocator>
class vector
{
public:

    typedef _TypeT                                     value_type;
    typedef _Allocator                                 allocator_type;
    typedef typename allocator_type::size_type        size_type;
    typedef typename allocator_type::difference_type  difference_type;
    typedef typename allocator_type::reference        reference;
    typedef typename allocator_type::const_reference  const_reference;
    typedef typename allocator_type::pointer          pointer;
    typedef typename allocator_type::const_pointer    const_pointer;

public:

#ifndef _RWSTD_NO_DEBUG_ITER

    typedef _RW::__rw_debug_iter <vector, pointer, pointer>  iterator;
    
    typedef _RW::__rw_debug_iter <vector, const_pointer, pointer>
        const_iterator;

    iterator _C_make_iter (pointer __ptr) {
        return iterator (*this, __ptr);
    }

    const_iterator _C_make_iter (pointer __ptr) const {
        return const_iterator (*this, __ptr);
    }

#else   // if defined (_RWSTD_NO_DEBUG_ITER)

    typedef pointer         iterator;
    typedef const_pointer   const_iterator;

    iterator _C_make_iter (pointer __ptr) {
        return __ptr;
    }

    const_iterator _C_make_iter (const_pointer __ptr) const {
        return __ptr;
    }

#endif   // _RWSTD_NO_DEBUG_ITER

#ifndef _RWSTD_NO_CLASS_PARTIAL_SPEC 

    typedef _STD::reverse_iterator<const_iterator> const_reverse_iterator;
    typedef _STD::reverse_iterator<iterator>       reverse_iterator;

#else   // if defined (_RWSTD_NO_CLASS_PARTIAL_SPEC)

    typedef _STD::reverse_iterator<const_iterator, 
        random_access_iterator_tag, value_type, 
        const_reference, const_pointer, difference_type>
    const_reverse_iterator;

    typedef _STD::reverse_iterator<iterator, 
        random_access_iterator_tag, value_type,
        reference, pointer, difference_type>
    reverse_iterator;

#endif   // _RWSTD_NO_CLASS_PARTIAL_SPEC 

public:

    explicit
    vector (const allocator_type &__alloc = allocator_type ())
        : _C_alloc (__alloc) { }

    explicit
    vector (size_type __n, const_reference __x = value_type (),
            const allocator_type &__alloc = allocator_type ())
        : _C_alloc (__alloc) {
        assign (__n, __x);
    }

    template <class _InputIter>
    vector (_InputIter __first, _InputIter __last,
            const allocator_type &__alloc = allocator_type ())
        : _C_alloc (__alloc) {
        assign (__first, __last);
    }

    vector (const vector &__rhs)
        : _C_alloc (__rhs.get_allocator ()) {
        assign (__rhs.begin (), __rhs.end ());
    }
    
    
    ~vector () { 
        _C_destroy (begin ());
        _C_alloc.deallocate (_C_alloc._C_begin,
                             _C_alloc._C_bufend - _C_alloc._C_begin);
    }
    
    vector& operator= (const vector&);
    
    template <class _InputIter>
    void assign (_InputIter __first, _InputIter __last) {
        // dispatch either to a range assign or to an assign with repetition
        _C_assign (__first, __last, _RWSTD_DISPATCH (_InputIter));
    }

    void assign (size_type __n, const_reference __x) {
        _C_assign_n (__n, __x);
    }

    allocator_type get_allocator () const {
        return _C_alloc;
    }
    
    iterator begin () {
        return _C_make_iter (_C_alloc._C_begin);
    }

    const_iterator begin () const {
        return _C_make_iter (_C_alloc._C_begin);
    }

    iterator end () {
        return _C_make_iter (_C_alloc._C_end);
    }

    const_iterator end () const {
        return _C_make_iter (_C_alloc._C_end);
    }
    
    reverse_iterator rbegin () { 
        return reverse_iterator (end ());
    }
    
    const_reverse_iterator rbegin () const { 
        return const_reverse_iterator (end ());
    }
    
    reverse_iterator rend () { 
        return reverse_iterator (begin ());
    }
    
    const_reverse_iterator rend () const { 
        return const_reverse_iterator (begin ());
    }

    size_type size () const {
        return size_type (_C_alloc._C_end - _C_alloc._C_begin);
    }

    size_type max_size () const {
        return _C_alloc.max_size ();
    }
    
    void resize (size_type, value_type = value_type ());

    size_type capacity () const {
        return _C_alloc._C_bufend - _C_alloc._C_begin;
    }
    
    bool empty () const {
        return _C_alloc._C_begin == _C_alloc._C_end;
    }
    
    void reserve (size_type);

    reference operator[] (size_type);
  
    const_reference operator[] (size_type) const;
  
    reference at (size_type);

    const_reference at (size_type __n)  const;
    
    reference front () {
        _RWSTD_ASSERT (!empty ());
        return *begin ();
    }
    
    const_reference front () const {
        _RWSTD_ASSERT (!empty ());
        return *begin ();
    }
    
    reference back () {
        _RWSTD_ASSERT (!empty ());
        return *(end () - 1);
    }
    
    const_reference back () const {
        _RWSTD_ASSERT (!empty ());
        return *(end () - 1);
    }

    void push_back (const_reference);
    
    void pop_back () {
        _RWSTD_ASSERT (!empty ());
        _C_alloc.destroy (_C_alloc._C_end - 1);
        --_C_alloc._C_end;
    }

    iterator insert (iterator, const_reference);

    template <class _InputIter>
    void insert (iterator __it, _InputIter __first, _InputIter __last) {
        _C_insert (__it, __first, __last, _RWSTD_DISPATCH (_InputIter));
    }

    void insert (iterator __it, size_type __n, const_reference __x) {
        _C_insert_n (__it, __n, __x);
    }
    
    iterator erase (iterator);

    iterator erase (iterator, iterator);

    void swap (vector&);
    
    void clear ();

#ifdef _RWSTD_NO_PART_SPEC_OVERLOAD

    friend void swap (vector& __lhs, vector& __rhs) {
        __lhs.swap (__rhs);
    }

#endif   // _RWSTD_NO_PART_SPEC_OVERLOAD

private:

    // implements assign with repetition
    void _C_assign_n (size_type, const_reference);

    // implements a single-element insert
    void _C_insert_1 (const iterator&, const_reference);

    // implements insert with repetition
    void _C_insert_n (const iterator&, size_type, const_reference);

    // implements range insert for ForwardIterators
    template <class _FwdIter>
    void _C_insert_range (iterator, _FwdIter, _FwdIter,
                          forward_iterator_tag);

    // implements range insert for InputIterators
    template <class _InputIter>
    void _C_insert_range (iterator, _InputIter, _InputIter,
                          input_iterator_tag);

    // implements range assign
    template <class _InputIter>
    void _C_assign (_InputIter __first, _InputIter __last, void*) {
        _RWSTD_ASSERT_RANGE (__first, __last);

        // dispatch to an assign suitable for the category of InputIter
        _RWSTD_ASSIGN_RANGE (__first, __last,
                             _RWSTD_ITERATOR_CATEGORY (_InputIter, __first));
    }

    // implements assign with repetition if value_type == size_type
    template <class _IntType>
    void _C_assign (_IntType __n, _IntType __x, int) {
        _C_assign_n (size_type (__n), __x);
    }

    // implements range insert for ForwardIterators
    template <class _FwdIter>
    void _C_assign_range (_FwdIter, _FwdIter, forward_iterator_tag);

    // implements range insert for InputIterators
    template <class _InputIter>
    void _C_assign_range (_InputIter, _InputIter, input_iterator_tag);

    // implements range insert
    template <class _InputIter>
    void _C_insert (const iterator &__it,
                   _InputIter __first, _InputIter __last, void*) {
        _RWSTD_ASSERT_RANGE (begin (), __it);
        _RWSTD_ASSERT_RANGE (__first, __last);

        // dispatch to an insert suitable for the category of InputIter
        _RWSTD_INSERT_RANGE (__it, __first, __last,
                             _RWSTD_ITERATOR_CATEGORY (_InputIter, __first));
    }

    // implements insert with repetition if value_type == size_type
    template <class _IntType>
    void _C_insert (const iterator &__it,
                    _IntType __n, _IntType __x, int) {
        _C_insert_n (__it, size_type (__n), __x);
    }

    void _C_realloc (size_type);

    // constructs a copy at the end and grows the size of container
    void _C_push_back (const_reference __x) {
        _RWSTD_ASSERT (_C_alloc._C_end != _C_alloc._C_bufend);
        _C_alloc.construct (_C_alloc._C_end, __x);
        ++_C_alloc._C_end;
    }

    // destroys elements from the iterator to the end of the vector
    // and resets end() to point to the iterator
    void _C_destroy (iterator);

    // implements swap for objects with unequal allocator
    void _C_unsafe_swap (vector&);

    struct _C_VectorAlloc: allocator_type {

        _C_VectorAlloc (const allocator_type &__alloc)
            : allocator_type (__alloc), _C_begin (), _C_end (), _C_bufend ()
            { /* empty */}

        pointer _C_begin;
        pointer _C_end;
        pointer _C_bufend;
    } _C_alloc;
};


template <class _TypeT, class _Allocator>
inline typename vector<_TypeT, _Allocator>::reference
vector<_TypeT, _Allocator>::
operator[] (size_type __n)
{
#ifdef _RWSTD_BOUNDS_CHECKING

    _RWSTD_REQUIRES (__n < size (),
                     (_RWSTD_ERROR_OUT_OF_RANGE,
                      _RWSTD_FUNC ("vector::operator[](size_type)"),
                      __n, size ()));

#endif   // _RWSTD_BOUNDS_CHECKING

    return *(begin () + __n);
}
  

template <class _TypeT, class _Allocator>
inline typename vector<_TypeT, _Allocator>::const_reference
vector<_TypeT, _Allocator>::
operator[] (size_type __n) const
{
#ifdef _RWSTD_BOUNDS_CHECKING

    _RWSTD_REQUIRES (__n < size (),
                     (_RWSTD_ERROR_OUT_OF_RANGE,
                      _RWSTD_FUNC ("vector::operator[](size_type) const"),
                      __n, size ()));

#endif   // _RWSTD_BOUNDS_CHECKING

    return *(begin () + __n);
}
  

template <class _TypeT, class _Allocator>
inline typename vector<_TypeT, _Allocator>::reference
vector<_TypeT, _Allocator>::
at (size_type __n)
{
    _RWSTD_REQUIRES (__n < size (),
                     (_RWSTD_ERROR_OUT_OF_RANGE,
                      _RWSTD_FUNC ("vector::at (size_type)"),
                      __n, size ()));
    return *(begin () + __n); 
}
    

template <class _TypeT, class _Allocator>
inline typename vector<_TypeT, _Allocator>::const_reference
vector<_TypeT, _Allocator>::
at (size_type __n)  const
{
    _RWSTD_REQUIRES (__n < size (),
                     (_RWSTD_ERROR_OUT_OF_RANGE,
                      _RWSTD_FUNC ("vector::at(size_type) const"),
                      __n, size ()));
    return *(begin () + __n); 
}


template <class _TypeT, class _Allocator>
inline void
vector<_TypeT, _Allocator>::
resize (size_type __new_size, value_type __x /* = value_type () */)
{
    if (size () < __new_size)
        insert (end (), __new_size - size (), __x);
    else if (__new_size < size ())
        erase (begin () + __new_size, end ());
}


template <class _TypeT, class _Allocator>
inline void
vector<_TypeT, _Allocator>::
reserve (size_type __n)
{
    _RWSTD_REQUIRES (__n <= max_size (),
                     (_RWSTD_ERROR_LENGTH_ERROR,
                      _RWSTD_FUNC ("vector::reserve(size_type)"),
                      __n, max_size ()));

    if (capacity () < __n)
        _C_realloc (__n);
}


template <class _TypeT, class _Allocator>
inline void
vector<_TypeT, _Allocator>::
push_back (const_reference __x)
{
    if (_C_alloc._C_end == _C_alloc._C_bufend)
        _C_insert_1 (end (), __x);
    else
        _C_push_back (__x);
}


template <class _TypeT, class _Allocator>
inline typename vector<_TypeT, _Allocator>::iterator
vector<_TypeT, _Allocator>::
insert (iterator __it, const_reference __x)
{
    _RWSTD_ASSERT_RANGE (__it, end ());

    const difference_type __off = __it - begin ();

    if (end () == __it)
        push_back (__x);
    else
        _C_insert_1 (__it, __x);

    return begin () + __off;
}


template <class _TypeT, class _Allocator>
inline typename vector<_TypeT, _Allocator>::iterator
vector<_TypeT, _Allocator>::
erase (iterator __it)
{
    _RWSTD_ASSERT_RANGE (__it, end ());
    _RWSTD_ASSERT (__it < end ());   // `it' must be dereferenceable

    const iterator __next = __it + 1;

    if (__next != end ()) 
        _STD::copy (__next, end (), __it);

    _C_alloc.destroy (_C_alloc._C_end - 1);
    --_C_alloc._C_end;

    return __it;
}


template <class _TypeT, class _Allocator>
inline typename vector<_TypeT, _Allocator>::iterator
vector<_TypeT, _Allocator>::
erase (iterator __first, iterator __last)
{
    _RWSTD_ASSERT_RANGE (__first, __last);
    _RWSTD_ASSERT_RANGE (begin (), __first);

    _C_destroy (_STD::copy (__last, end (), __first));

    return __first;
}


template <class _TypeT, class _Allocator>
inline void
vector<_TypeT, _Allocator>::
clear ()
{
    if (!empty ())
        _C_destroy (begin ());
}


template <class _TypeT, class _Allocator>
inline void
vector<_TypeT, _Allocator>::
swap (vector &__other)
{
    if (get_allocator () == __other.get_allocator ()) {
        pointer __tmp             = _C_alloc._C_begin;
        _C_alloc._C_begin         = __other._C_alloc._C_begin;
        __other._C_alloc._C_begin = __tmp;
        __tmp                     = _C_alloc._C_end;
        _C_alloc._C_end           = __other._C_alloc._C_end;
        __other._C_alloc._C_end   = __tmp;
        __tmp                     = _C_alloc._C_bufend;
        _C_alloc._C_bufend        = __other._C_alloc._C_bufend;
        __other._C_alloc._C_bufend = __tmp;
    }
    else {
        // not exception-safe
        _C_unsafe_swap (__other);
    }
}


template <class _TypeT, class _Allocator>
inline bool
operator== (const vector<_TypeT, _Allocator> &__x,
            const vector<_TypeT, _Allocator> &__y)
{
    return __x.size () == __y.size ()
        && _STD::equal(__x.begin (), __x.end (), __y.begin ());
}

template <class _TypeT, class _Allocator>
inline bool
operator< (const vector<_TypeT, _Allocator> &__x,
           const vector<_TypeT, _Allocator> &__y)
{
    return _STD::lexicographical_compare (__x.begin (), __x.end (),
                                          __y.begin (), __y.end ());
}

template <class _TypeT, class _Allocator>
inline bool
operator!= (const vector<_TypeT, _Allocator> &__x,
            const vector<_TypeT, _Allocator> &__y)
{
    return !(__x == __y);
}

template <class _TypeT, class _Allocator>
inline bool
operator> (const vector<_TypeT, _Allocator> &__x,
           const vector<_TypeT, _Allocator> &__y)
{
    return __y < __x;
}

template <class _TypeT, class _Allocator>
inline bool
operator>= (const vector<_TypeT, _Allocator> &__x,
            const vector<_TypeT, _Allocator> &__y)
{
    return !(__x < __y);
}

template <class _TypeT, class _Allocator>
inline bool
operator<= (const vector<_TypeT, _Allocator> &__x,
            const vector<_TypeT, _Allocator> &__y)
{
    return !(__y <  __x);
}

#ifndef _RWSTD_NO_PART_SPEC_OVERLOAD

template <class _TypeT, class _Allocator>
inline void
swap (vector<_TypeT, _Allocator> &__x, vector<_TypeT, _Allocator> &__y)
{
    __x.swap (__y);
}

#endif   // _RWSTD_NO_PART_SPEC_OVERLOAD

/***************************************************************************/

#ifndef _RWSTD_NO_VECTOR_BOOL

#ifndef _RWSTD_NO_BOOL

   // number of bits in a machine word
#  define _RWSTD_WORD_BIT (int (_RWSTD_CHAR_BIT * sizeof (unsigned int)))


#ifndef _RWSTD_NO_CLASS_PARTIAL_SPEC

_EXPORT
template <class _Allocator>
class

#else   // if defined (_RWSTD_NO_CLASS_PARTIAL_SPEC)

     // use a macro to mutate _Allocator into allocator<bool>
# define _Allocator allocator<bool>

_RWSTD_SPECIALIZED_CLASS
class _RWSTD_EXPORT

#endif  // _RWSTD_NO_CLASS_PARTIAL_SPEC

vector<bool, _Allocator >: private _Allocator
{
#if defined (_RWSTD_NO_CLASS_PARTIAL_SPEC)
    // clear typename
#  undef typename
#  define typename
#endif  // _RWSTD_NO_CLASS_PARTIAL_SPEC

    typedef _RWSTD_REBIND(_Allocator, unsigned int)       _C_value_alloc_type;
    typedef vector                                        _C_self;
public:

    typedef _Allocator                                      allocator_type;
    typedef bool                                            value_type;

    typedef typename allocator_type::size_type             size_type;
    typedef typename allocator_type::difference_type       difference_type;
    typedef typename _C_value_alloc_type::pointer          pointer;
    typedef typename _C_value_alloc_type::const_pointer    const_pointer;

#if defined (_RWSTD_NO_CLASS_PARTIAL_SPEC)
    // restore typename
#  undef typename
#  define typename   typename
#endif  // _RWSTD_NO_CLASS_PARTIAL_SPEC

    class iterator;
    class const_iterator;

    class reference {

#if !defined (__INTEL_COMPILER) || !defined (_MSC_VER)
        // avoid MSVC 6.0 bug 576
        friend class iterator;
#else   // if Intel C++ 8.1 with MSVC
        // work around Intel C++ 8.1 bug 575
        friend class _C_self::iterator;
#endif   // Intel C++ with MSVC

        friend class const_iterator;

    private:

        unsigned int* _C_p;
        unsigned int _C_mask;
        reference (unsigned int* __x, unsigned int __y)
            : _C_p (__x), _C_mask (__y) { }
    public:

        reference () : _C_p (), _C_mask () {}

        operator bool () const {
            return !!(*_C_p & _C_mask);
        }

        reference& operator= (bool __x) {
            if (__x)      
                *_C_p |= _C_mask;
            else
                *_C_p &= ~_C_mask;
            return *this;
        }

        reference& operator= (const reference& __x) {
            return *this = bool(__x);
        }

#ifndef _RWSTD_NO_EXT_VECTOR_BOOL_REF_OPS

      bool operator== (const reference& __x) const {
          return bool(*this) == bool(__x);
      }

      bool operator< (const reference& __x) const {
#ifndef _MSC_VER
          return bool(*this) < bool(__x);
#else
          return int(*this) < int(__x);
#endif
      }

        bool operator!= (const reference& __x) const {
            return !(*this == __x);
        }

        bool operator> (const reference& __x) const {
            return  __x < *this;
        }

        bool operator>= (const reference& __x) const {
            return !(*this < __x);
        }

        bool operator<= (const reference& __x) const {
            return !(*this > __x);
        }

#endif // _RWSTD_NO_EXT_VECTOR_BOOL_REF_OPS

        void flip () {
            *_C_p ^= _C_mask;
        }
    };
    
    typedef bool const_reference;

    // hacks working around bogus g++ 2.95.2 warnings coming out of
    // iterators below as well as what's probably an MSVC 6.0 bug
    typedef reference       _C_ref;
    typedef const_reference _C_const_ref;
    typedef difference_type _C_diff_t;

    class _C_iter {
        friend class iterator;
        friend class const_iterator;

    private:

#if defined (__GNUG__)
        // gcc 3.0.1 and prior take 14.5.3, p9 literally
    public:
#elif    defined (_MSC_VER) && _MSC_VER <= 1300 || defined (__APOGEE__)
        friend class vector<bool, _Allocator>;
#else
        friend class vector;
#endif
        unsigned int* _C_p;        // pointer to the current word
        unsigned int  _C_offset;   // number of the pointed-to bit

        _C_iter (unsigned int* __x = 0, unsigned int __y = 0)
            : _C_p (__x), _C_offset (__y) { }

        // On Sun, gcc 3.1 does generate an incorrect copy constructor
        // that has as an effect an incompletely/incorrectly initialized 
        // iterator.
#if    defined (__sun__) && defined (__GNUG__) \
    || defined (__SUNPRO_CC) && defined (__amd64__)

        // working around a gcc 3.1 bug on Solaris where the compiler
        // generates bad code for the implicitly defined copy ctor
        // also working around a Sun C++ 5.9 optimizer ICE on x86_64
        // in wide (64-bit) mode (see STDCXX-551)

        _C_iter (const _C_iter& __it)
            : _C_p (__it._C_p), _C_offset (__it._C_offset) {}
#endif   // gcc 3.1/Solaris || Sun C++ 5.9/x86_64

        void operator++ () {
            if (_C_offset++ == _RWSTD_WORD_BIT - 1) {
                _C_offset = 0; 
                ++_C_p;
            }
        }

        void operator-- () {
            if (_C_offset-- == 0) {
                _C_offset = _RWSTD_WORD_BIT - 1; 
                --_C_p;
            }
        }

        void operator+= (difference_type __i) {
            difference_type __n = __i + _C_offset;
            _C_p += __n / _RWSTD_WORD_BIT;
            __n = __n % _RWSTD_WORD_BIT;
            if (__n < 0) {
                _C_offset = _RWSTD_STATIC_CAST (unsigned int,
                                                __n + _RWSTD_WORD_BIT);
                --_C_p;
            }
            else
                _C_offset = _RWSTD_STATIC_CAST (unsigned int,__n);
        }

    public:

        bool operator== (const _C_iter& __x) const {
            return _C_p == __x._C_p && _C_offset == __x._C_offset;
        }

        bool operator< (const _C_iter& __x) const {
            return _C_p < __x._C_p ||
                (_C_p == __x._C_p && _C_offset < __x._C_offset);
        }

        bool operator!= (const _C_iter& __x) const {
            return !(*this == __x);
        }

        bool operator> (const _C_iter& __x) const {
            return __x < *this;
        }

        bool operator>= (const _C_iter& __x) const {
            return !(*this < __x);
        }

        bool operator<= (const _C_iter& __x) const {
            return !(*this > __x);
        }
    };
      
    class iterator
        : public _C_iter,
          public _STD::iterator<random_access_iterator_tag,
                                value_type, _C_diff_t,
                                pointer, _C_ref> {
    public:

        // bring names used in declarations below into scope
        // (dependent base members not visible without qualification)
        typedef _C_ref    reference;
        typedef _C_diff_t difference_type;

        iterator (unsigned int *__x = 0, unsigned int __y = 0)
            : _C_iter (__x, __y) { }

        reference operator* () const { 
            return reference (this->_C_p, 1U << this->_C_offset); 
        }

        iterator& operator++ () {
            return _C_iter::operator++(), *this;
        }

        iterator operator++ (int) {
            iterator __tmp = *this;
            ++*this;
            return __tmp;
        }

        iterator& operator-- () {
            return _C_iter::operator--(), *this;
        }

        iterator operator-- (int) {
            iterator __tmp = *this;
            --*this;
            return __tmp;
        }

        iterator& operator+= (difference_type __i) {
            return _C_iter::operator+= (__i), *this;
        }

        iterator& operator-= (difference_type __i) {
            *this += -__i;
            return *this;
        }

        iterator operator+ (difference_type __i) const {
            iterator __tmp = *this;
            return __tmp += __i;
        }

        iterator operator- (difference_type __i) const {
            iterator __tmp = *this;
            return __tmp -= __i;
        }

        difference_type operator- (iterator __x) const {
            return   _RWSTD_WORD_BIT * (this->_C_p - __x._C_p)
                   + this->_C_offset - __x._C_offset;
        }

        reference operator[] (difference_type __i) {
            return *(*this + __i);
        }

        friend iterator operator+ (difference_type __i,
                                   const iterator &__x) {
            return __x + __i;
        }
    };

    class const_iterator
        : public _C_iter,
          public _STD::iterator<random_access_iterator_tag,
                                value_type, _C_diff_t,
                                const_pointer, _C_const_ref> {
    public:

        // bring names used in declarations below into scope
        // (dependent base members not visible without qualification)
        typedef _C_const_ref const_reference;
        typedef _C_diff_t    difference_type;

        const_iterator (unsigned int *__x = 0, unsigned int __y = 0)
            : _C_iter (__x, __y) { }

        const_iterator (const _C_iter &__x)
            : _C_iter (__x) { }

        const_reference operator* () const {
            return _C_ref (this->_C_p, 1U << this->_C_offset);
        }

        const_iterator& operator++ () {
            return _C_iter::operator++(), *this;
        }

        const_iterator operator++ (int) {
            const_iterator __tmp = *this;
            ++*this;
            return __tmp;
        }

        const_iterator& operator-- () {
            return _C_iter::operator--(), *this;
        }

        const_iterator operator-- (int) {
            const_iterator __tmp = *this;
            --*this;
            return __tmp;
        }

        const_iterator& operator+= (difference_type __i) {
            return _C_iter::operator+= (__i), *this;
        }

        const_iterator& operator-= (difference_type __i) {
            return *this += -__i;
        }

        const_iterator
        operator+ (difference_type __i) const {
            return const_iterator (*this) += __i;
        }

        const_iterator operator- (difference_type __i) const {
            return const_iterator (*this) -= __i;
        }

        difference_type operator- (const_iterator __x) const {
            return   _RWSTD_WORD_BIT * (this->_C_p - __x._C_p)
                   + this->_C_offset - __x._C_offset;
        }

        const_reference operator[] (difference_type __i) { 
            return *(*this + __i); 
        }

        friend const_iterator operator+ (difference_type __i,
                                         const const_iterator &__x) {
            return __x + __i;
        }
    };

#ifndef _RWSTD_NO_CLASS_PARTIAL_SPEC 

    typedef _STD::reverse_iterator<const_iterator> const_reverse_iterator;
    typedef _STD::reverse_iterator<iterator>       reverse_iterator;

#else

    typedef _STD::reverse_iterator<const_iterator, 
        random_access_iterator_tag, value_type, 
        const_reference, const_pointer, difference_type>
    const_reverse_iterator;

    typedef _STD::reverse_iterator<iterator, 
        random_access_iterator_tag, value_type,
        reference, pointer, difference_type>
    reverse_iterator;

#endif   // _RWSTD_NO_CLASS_PARTIAL_SPEC 

  private:
    //
    // These private functions are replicas of generic algorithms.
    //  We provide them here to avoid putting instantiations of 
    //  the generic algorithms into an archive or shared library.
    //  This gives you full flexibilty in deciding where you want
    //  to put particular instantiations of the generic 
    //  algorithms.
    //
  
    void _C_fill (iterator __first, iterator __last, bool __val) {
        while (__first != __last) *__first++ = __val;
    }

    void _C_fill_n (iterator __first, size_type __n, bool __val) {
        while (__n-- > 0) *__first++ = __val;
    }

    template <class _Iterator>
    iterator _C_copy (_Iterator __first, _Iterator __last, iterator __res) {
        while (__first != __last)
            *__res++ = *__first++;
        return __res;
    }

    template <class _Iterator>
    iterator
    _C_copy_backward (_Iterator __first, _Iterator __last, iterator __res) {
        while (__first != __last) *--__res = *--__last;
        return __res;
    }

private:

    iterator       _C_begin;
    iterator       _C_end;
    unsigned int * _C_bufend;

    unsigned int* _C_bit_alloc (size_type __n) {
        return _C_value_alloc_type(*this).
            allocate ((__n + _RWSTD_WORD_BIT - 1)/_RWSTD_WORD_BIT,
                      pointer(_C_begin._C_p));
    }

    void _C_init (size_type __n) {
        unsigned int* __q = _C_bit_alloc(__n);
        _C_bufend = __q + (__n + _RWSTD_WORD_BIT - 1)/_RWSTD_WORD_BIT;
        _C_begin  = iterator(__q, 0);
        _C_end    = _C_begin + __n;
    }

    void _C_insert (iterator, bool);

public:

    vector (const _Allocator&  __alloc = allocator_type ())
        : allocator_type (__alloc), _C_begin(iterator()), _C_end(iterator()), 
        _C_bufend () { }

#if !defined (__SUNPRO_CC) || __SUNPRO_CC > 0x530
    // working around a SunPro 5.3 bug (see PR #25962)
    explicit
#endif   // SunPro > 5.3
    vector (size_type __n, bool __val = bool (), 
       const _Allocator&  __alloc = allocator_type ())
        : allocator_type (__alloc), _C_bufend () {
      _C_init(__n); 
      unsigned int * __first = _C_begin._C_p;
      size_type __m = (__n + _RWSTD_WORD_BIT - 1)/_RWSTD_WORD_BIT;
      while (__m-- > 0) *__first++ = __val ? ~0 : 0;
    }

    vector (const _C_self &__x)
        : allocator_type (__x.get_allocator ()), _C_bufend  () {
        _C_init (__x.size ()); 
        _C_copy (__x.begin (), __x.end (), _C_begin);
    }

    template<class _InputIter>
    vector  (_InputIter __first, _InputIter __last)
        : allocator_type (), _C_bufend ()
    {
      size_type __n = _DISTANCE (__first, __last, size_type);
      _C_init(__n); 
      _C_copy(__first, __last, _C_begin);
    }
  
    ~vector () {
      _C_value_alloc_type(*this).deallocate(_C_begin._C_p,  
        _C_bufend - _C_begin._C_p); 
    }
    _C_self& operator= (const _C_self& __x)
    {
      if (&__x == this) return *this;
      if (__x.size() > capacity())
      {
        _C_value_alloc_type(*this).deallocate(_C_begin._C_p,
          _C_bufend - _C_begin._C_p); 
        _C_init(__x.size());
      }
      _C_copy(__x.begin(), __x.end(), begin());
      _C_end = begin() + __x.size();
      return *this;
    }

    template<class _InputIter>
    void assign (_InputIter __first, _InputIter __last) {
        clear ();
        insert (begin (), __first, __last);
    }

    void assign (size_type __n, const bool& __x = bool()) { 
        clear ();
        insert (begin (), __n, __x);
    }

    allocator_type get_allocator() const {
      return *this;
    }

    //
    // iterators
    //
    iterator       begin ()       { return _C_begin; }
    const_iterator begin () const 
    { return const_iterator(_C_begin._C_p,_C_begin._C_offset); }
    iterator       end   ()       { return _C_end; }
    const_iterator end   () const 
    { return const_iterator(_C_end._C_p,_C_end._C_offset); }

    reverse_iterator       rbegin () { return reverse_iterator(end()); }
    const_reverse_iterator rbegin () const
    { 
      return const_reverse_iterator(end()); 
    }
    reverse_iterator       rend () { return reverse_iterator(begin()); }
    const_reverse_iterator rend () const
    { 
      return const_reverse_iterator(begin()); 
    }

    //
    // capacity
    //
    size_type size     () const { return size_type(end() - begin());  }
    size_type max_size () const {
        return _C_value_alloc_type(*this).max_size();
    }
    void resize (size_type __new_size, bool __c = false);
    size_type capacity () const
    {
      return size_type(const_iterator(_C_bufend, 0) - begin());
    }
    bool empty () const { return begin() == end(); }
    void reserve (size_type __n)
    {
        _RWSTD_REQUIRES (__n <= max_size (),
                         (_RWSTD_ERROR_LENGTH_ERROR,
                          _RWSTD_FUNC ("vector<bool>::reserve (size_type)"),
                          __n, max_size ()));

      if (capacity() < __n)
      {
        unsigned int* __q = _C_bit_alloc(__n);
        _C_end = _C_copy(begin(), end(), iterator(__q, 0));
        _C_value_alloc_type(*this).deallocate(_C_begin._C_p,
                                             _C_bufend - _C_begin._C_p);
        _C_begin = iterator(__q, 0);
        _C_bufend = __q + (__n + _RWSTD_WORD_BIT - 1)/_RWSTD_WORD_BIT;
      }
    }

    //
    // element access
    //
    reference       operator[] (size_type __n)       
    { 
#ifdef _RWSTD_BOUNDS_CHECKING

        _RWSTD_REQUIRES (__n < size (),
                         (_RWSTD_ERROR_LENGTH_ERROR,
                          _RWSTD_FUNC ("vector<bool>::[](size_type)"),
                          __n, size ()));

#endif   // _RWSTD_BOUNDS_CHECKING

      return *(begin() + __n); 
    }
    const_reference operator[] (size_type __n) const 
    { 
#ifdef _RWSTD_BOUNDS_CHECKING

        _RWSTD_REQUIRES (__n < size (),
                         (_RWSTD_ERROR_LENGTH_ERROR,
                          _RWSTD_FUNC ("vector<bool>::[](size_type)"),
                          __n, size ()));

#endif   // _RWSTD_BOUNDS_CHECKING

      return *(begin() + __n); 
    }
    reference       at (size_type __n)               
    { 
        _RWSTD_REQUIRES (__n < size (),
                         (_RWSTD_ERROR_LENGTH_ERROR,
                          _RWSTD_FUNC ("vector<bool>::at(size_type)"),
                          __n, size ()));
      return *(begin() + __n); 
    }
    const_reference at (size_type __n)   const 
    {
        _RWSTD_REQUIRES (__n < size (),
                         (_RWSTD_ERROR_LENGTH_ERROR,
                          _RWSTD_FUNC ("vector<bool>::at(size_type) const"),
                          __n, size ()));

      return *(begin() + __n); 
    }
    reference       front ()       { return *begin();     }
    const_reference front () const { return *begin();     }
    reference       back  ()       { return *(end() - 1); }
    const_reference back  () const { return *(end() - 1); }
    
    //
    // modifiers
    //
    void push_back (const bool& __x)
    {
        if (_C_end._C_p != _C_bufend) {
            ++_C_end;
            *(_C_end-1) = __x;
        }
        else
            _C_insert(end(), __x);
    }

    void pop_back () { --_C_end; }

    iterator insert (iterator __it, const bool& __x = bool())
    {
      size_type __n = __it - begin();
      if (_C_end._C_p != _C_bufend && __it == end()) {
          ++_C_end;
          *(_C_end-1) = __x;
      }
      else
        _C_insert(__it, __x);
      return begin() + __n;
    }

    void insert (iterator __it, size_type __n, const bool& __x);

    template<class _InputIter>
    void insert (iterator __it, _InputIter __first,
                 _InputIter __last);

    iterator erase (iterator __it)
    {
      if (!(__it + 1 == end()))
        _C_copy(__it + 1, end(), __it);
      --_C_end;
      return __it;
    }

    iterator erase(iterator __first, iterator __last)
    {
      _C_end = _C_copy(__last, end(), __first);
      return __first;
    }

    void swap (_C_self& __x)
    {
      if((_C_value_alloc_type)*this == (_C_value_alloc_type)__x)
      {
        _STD::swap (_C_begin,  __x._C_begin);
        _STD::swap (_C_end,    __x._C_end);
        _STD::swap (_C_bufend, __x._C_bufend);
      }
      else
      {
        _C_self _x = *this;
        *this = __x;
        __x=_x;
      } 
    }

    static void swap(reference __x, reference __y);

    void flip ();

    void clear()
    {
      erase(begin(),end());
    }

#if defined (_RWSTD_NO_PART_SPEC_OVERLOAD)
    friend void swap (vector& __lhs, vector& __rhs) {
        __lhs.swap (__rhs);
    }
#endif

};

#undef _Allocator 

#endif   // _RWSTD_NO_BOOL

#endif   // _RWSTD_NO_VECTOR_BOOL

}   // namespace std


#if defined (_RWSTD_NO_IMPLICIT_INCLUSION)
#  include <vector.cc>
#endif


#endif   // _RWSTD_VECTOR_INCLUDED