// -*- C++ -*-
/***************************************************************************
 *
 * <bitset> - definition of the bitset 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 1994-2006 Rogue Wave Software.
 * 
 **************************************************************************/

#ifndef _RWSTD_BITSET_INCLUDED
#define _RWSTD_BITSET_INCLUDED


#include <string>

#include <rw/_iosfwd.h>
#include <rw/_error.h>
#include <rw/_defs.h>


_RWSTD_NAMESPACE (__rw) {

// helper, implements bitset converting ctor
_EXPORT
template <class _CharT, class _Traits>
void
__rw_bitset (unsigned long*, _RWSTD_SIZE_T,
             const _CharT*, _RWSTD_SIZE_T,
             const _Traits*, _CharT, _CharT,
             _RWSTD_SIZE_T, _RWSTD_SIZE_T,
             const char*, const char*);

_RWSTD_SPECIALIZED_FUNCTION
_RWSTD_EXPORT void
__rw_bitset (unsigned long*, _RWSTD_SIZE_T,
             const char*, _RWSTD_SIZE_T,
             const _STD::char_traits<char>*, char, char,
             _RWSTD_SIZE_T, _RWSTD_SIZE_T,
             const char*, const char*);

#ifdef __SUNPRO_CC
#  pragma no_side_effect (__rw_bitset)
#endif   // Sun C++

#ifndef _RWSTD_NO_WCHAR_T

_RWSTD_SPECIALIZED_FUNCTION
_RWSTD_EXPORT void
__rw_bitset (unsigned long*, _RWSTD_SIZE_T,
             const wchar_t*, _RWSTD_SIZE_T,
             const _STD::char_traits<wchar_t>*, wchar_t, wchar_t,
             _RWSTD_SIZE_T, _RWSTD_SIZE_T,
             const char*, const char*);

#  ifdef __SUNPRO_CC
#    pragma no_side_effect (__rw_bitset)
#  endif   // Sun C++
#endif   // _RWSTD_NO_WCHAR_T

// helper, implements bitset::count()
_RWSTD_EXPORT _RWSTD_SIZE_T
__rw_bit_count (const unsigned long*, _RWSTD_SIZE_T) _THROWS (());

// helpers, implement bitset<>::operator<<=() and operator>>=()
_RWSTD_EXPORT void
__rw_shl (unsigned long*, _RWSTD_SIZE_T, _RWSTD_SIZE_T) _THROWS (());

_RWSTD_EXPORT void
__rw_shr (unsigned long*, _RWSTD_SIZE_T, _RWSTD_SIZE_T) _THROWS (());

#ifdef __SUNPRO_CC
#  pragma no_side_effect (__rw_bit_count, __rw_shl, __rw_shr)
#endif   // Sun C++

}   // namespace __rw


_RWSTD_NAMESPACE (std) {


_EXPORT
template <_RWSTD_SIZE_T _Size>
class bitset
{
    enum { _C_elembits = _RWSTD_CHAR_BIT * sizeof (unsigned long) };
    enum { _C_nelems   = _Size ? 1 + (_Size - 1) / _C_elembits : 0 };

    // must have at least one element even if size is 0
    unsigned long _C_bits [_C_nelems ? _C_nelems : 1];

    bool _C_valid_pos (_RWSTD_SIZE_T __pos) const _THROWS (()) {
        // prevent warnings if _Size == 0
        return _Size + 1 > __pos + 1;
    }

    void _C_from_ulong (unsigned long __n) _THROWS (()) {
        reset ();
        _C_bits [0] =
            __n & (_RWSTD_ULONG_MAX >> ((_Size > _C_elembits ? 0 :
                _C_elembits - _Size % _C_elembits) % _C_elembits));
    }

    template <class _CharT, class _Traits>
    void _C_from_char (const _CharT *__str, _RWSTD_SIZE_T __len,
                       const _Traits *__traits, _CharT __b0, _CharT __b1,
                       _RWSTD_SIZE_T __pos, _RWSTD_SIZE_T __n,
                       const char *__file, const char *__fun) {
        _RW::__rw_bitset (_C_bits, _Size, __str, __len,
                          __traits, __b0, __b1,
                          __pos, __n, __file, __fun);
    }

public:

    class reference {
        friend class bitset<_Size>;

        bitset<_Size>& _C_ref;
        _RWSTD_SIZE_T  _C_pos;

        reference (bitset<_Size> &__r, _RWSTD_SIZE_T __p) _THROWS (())
            : _C_ref (__r), _C_pos (__p) { }
    public:

        reference& operator= (bool __val) _THROWS (()) {
            return _C_ref.set (_C_pos, __val), *this;
        }

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

        bool operator~ () const _THROWS (()) {
            return !bool (*this);
        }

        operator bool () const _THROWS (()) {
            return _RWSTD_CONST_CAST (const bitset<_Size>&, _C_ref)[_C_pos];
        }

        reference& flip () _THROWS (()) {
            return _C_ref.flip (_C_pos), *this;
        }
    };

    // 23.3.5.1, p1
    bitset () _THROWS (()) {
        reset ();
    }

    // 23.3.5.1, p2
    bitset (unsigned long __n) _THROWS (()) {
        _C_from_ulong (__n);
    }

#if    !defined (_RWSTD_NO_NONDEDUCED_CONTEXT) \
    && (!defined (__SUNPRO_CC) || __SUNPRO_CC > 0x550)

    // 23.3.5.1, p3
    template <class _CharT, class _Traits, class _Allocator>
    _EXPLICIT
    bitset (const basic_string<_CharT, _Traits, _Allocator> &__str,
            _TYPENAME basic_string<_CharT, _Traits,
                                   _Allocator>::size_type __pos = 0,
            _TYPENAME basic_string<_CharT, _Traits,
                                   _Allocator>::size_type __n =
                                       _RWSTD_SIZE_MAX,
            _CharT __b0 = '0', _CharT __b1 = '1') {
        _C_from_char (__str.data (), __str.size (),
                      (_Traits*)0, __b0, __b1, __pos, __n,
                      _RWSTD_FUNC ("bitset::bitset (const basic_string&, "
                                   "size_type, size_type)"));
    }

#else   // if defined (_RWSTD_NO_NONDEDUCED_CONTEXT)

    // working around a SunPro 5.5 and prior bug (PR #28992)

    // 23.3.5.1, p3
    template <class _CharT, class _Traits, class _Allocator>
    _EXPLICIT
    bitset (const basic_string<_CharT, _Traits, _Allocator> &__str,
            _RWSTD_SIZE_T __pos = 0, _RWSTD_SIZE_T __n = _RWSTD_SIZE_MAX,
            _CharT __b0 = '0', _CharT __b1 = '1') {
        _C_from_char (__str.data (), __str.size (),
                      (const _Traits*)0, __b0, __b1, __pos, __n,
                      _RWSTD_FUNC ("bitset::bitset (const basic_string&, "
                                   "size_t, size_t)"));
    }

#endif   // _RWSTD_NO_NONDEDUCED_CONTEXT


#ifndef _RWSTD_NO_EXT_BITSET_CTOR_STRING
#  ifndef _RWSTD_NO_MEMBER_TEMPLATE_OVERLOAD

    // extension
    _EXPLICIT
    bitset (const string &__str,
            _RWSTD_SIZE_T __pos = 0, _RWSTD_SIZE_T __n = _RWSTD_SIZE_MAX,
            char __b0 = '0', char __b1 = '1') {
        _C_from_char (__str.data (), __str.size (),
                      (const char_traits<char>*)0, __b0, __b1, __pos, __n,
                      _RWSTD_FUNC ("bitset::bitset (const string&, "
                                   "size_t, size_t)"));
    }

#    ifndef _RWSTD_NO_WCHAR_T

    // extension
    _EXPLICIT
    bitset (const wstring &__str,
            _RWSTD_SIZE_T __pos = 0, _RWSTD_SIZE_T __n = _RWSTD_SIZE_MAX,
            wchar_t __b0 = L'0', wchar_t __b1 = L'1') {
        _C_from_char (__str.data (), __str.size (),
                      (const char_traits<wchar_t>*)0,  __b0, __b1, __pos, __n,
                      _RWSTD_FUNC ("bitset::bitset (const wstring&, "
                                   "size_t, size_t)"));
    }

#    endif   // _RWSTD_NO_WCHAR_T
#  endif   // _RWSTD_NO_MEMBER_TEMPLATE_OVERLOAD
#endif   // _RWSTD_NO_EXT_BITSET_CTOR_STRING


#ifndef _RWSTD_NO_EXT_BITSET_CTOR_CHAR_ARRAY

    // extension
    _EXPLICIT
    bitset (const char *__str,
            _RWSTD_SIZE_T __pos = 0, _RWSTD_SIZE_T __n = _RWSTD_SIZE_MAX,
            char __b0 = '0', char __b1 = '1') {
        _C_from_char (__str, _RWSTD_SIZE_MAX,
                      (const char_traits<char>*)0, __b0, __b1, __pos, __n,
                      _RWSTD_FUNC ("bitset::bitset (const char*, "
                                   "size_t, size_t)"));
    }

#  ifndef _RWSTD_NO_WCHAR_T

    // extension
    _EXPLICIT
    bitset (const wchar_t *__str,
            _RWSTD_SIZE_T __pos = 0, _RWSTD_SIZE_T __n = _RWSTD_SIZE_MAX,
            wchar_t __b0 = L'0', wchar_t __b1 = L'1') {
        _C_from_char (__str, _RWSTD_SIZE_MAX,
                      (const char_traits<wchar_t>*)0, __b0, __b1, __pos, __n,
                      _RWSTD_FUNC ("bitset::bitset (const wchar_t*, "
                                   "size_t, size_t)"));
    }

#  endif   // _RWSTD_NO_WCHAR_T

    // extension:
    // uses char_traits<CharT>::length() to compute the length of the string
    // and char_traits<CharT>::eq() to compare characters with `b0' and `b1'
    template <class _CharT>
    _EXPLICIT
    bitset (const _CharT *__str,
            _RWSTD_SIZE_T __pos = 0, _RWSTD_SIZE_T __n = _RWSTD_SIZE_MAX,
            _CharT __b0 = '0', _CharT __b1 = '1') {
        _C_from_char (__str, _RWSTD_SIZE_MAX,
                      (const char_traits<_CharT>*)0, __b0, __b1, __pos, __n,
                      _RWSTD_FUNC ("bitset::bitset (const charT*, "
                                   "size_t, size_t)"));
    }

    // extensions:
    // prevent ambiguities between the above and bitset(unsigned long)
    bitset (int __n) _THROWS (()) {
        _C_from_ulong (__n);
    }

    bitset (unsigned __n) _THROWS (()) {
        _C_from_ulong (__n);
    }

    bitset (long __n) _THROWS (()) {
        _C_from_ulong (__n);
    }

#endif   // _RWSTD_NO_EXT_BITSET_CTOR_CHAR_ARRAY

    // 23.3.5.2, p1
    bitset& operator&= (const bitset &__rhs) _THROWS (()) {
        for (_RWSTD_SIZE_T __i = 0; __i != _C_nelems; ++__i)
            _C_bits [__i] &= __rhs._C_bits [__i];
        return *this;
    }

    // 23.3.5.2, p3
    bitset& operator|= (const bitset &__rhs) _THROWS (()) {
        for (_RWSTD_SIZE_T __i = 0; __i != _C_nelems; ++__i)
            _C_bits[__i] |= __rhs._C_bits [__i];
        return *this;
    }

    // 23.3.5.2, p5
    bitset& operator^= (const bitset& __rhs) _THROWS (()) {
        for (_RWSTD_SIZE_T __i = 0; __i != _C_nelems; ++__i)
            _C_bits [__i] ^= __rhs._C_bits [__i];
        return *this;
    }

    // 23.3.5.2, p7
    bitset& operator<<= (_RWSTD_SIZE_T) _THROWS (());

    // 23.3.5.2, p9
    bitset& operator>>= (_RWSTD_SIZE_T) _THROWS (());

    // 23.3.5.2, p11
    bitset& set () _THROWS (());

    // 23.3.5.2, p13: follows proposed resolution of lwg issue 186
    bitset& set (_RWSTD_SIZE_T, bool = true);

    // 23.3.5.2, p17
    bitset& reset () _THROWS (()) {
        return 1 == _C_nelems ? (void)(_C_bits [0] = 0)
            : (void)_RWSTD_MEMSET (_C_bits, 0, sizeof (_C_bits)), *this;
    }

    // 23.3.5.2, p19
    bitset& reset (_RWSTD_SIZE_T __pos) {
        return set (__pos, false);
    }

    // 23.3.5.2, p23
    bitset operator~ () const _THROWS (()) {
        return bitset (*this).flip ();
    }

    // 23.3.5.2, p25
    bitset& flip () _THROWS (()) {
        for (_RWSTD_SIZE_T __i = 0; __i != _C_nelems; __i++)
            _C_bits [__i] = ~_C_bits [__i];
        _C_bits [_C_nelems - !!_C_nelems] &=
          _RWSTD_ULONG_MAX >> (_C_elembits - _Size % _C_elembits) % _C_elembits;
        return *this;
    }

    // 23.3.5.2, p27
    bitset& flip (_RWSTD_SIZE_T __pos) {
        _RWSTD_REQUIRES (_C_valid_pos (__pos),
                         (_RWSTD_ERROR_OUT_OF_RANGE,
                          _RWSTD_FUNC ("bitset::flip(size_t)"),
                          __pos, _C_nelems));

        _C_bits [__pos / _C_elembits] ^= 1UL << __pos % _C_elembits;
        return *this;
    }

    // 23.3.5.2, p??
    bool operator[] (_RWSTD_SIZE_T __pos) const _THROWS (()) {
        _RWSTD_ASSERT (_C_valid_pos (__pos));
        return !!(_C_bits [__pos / _C_elembits] & (1UL << __pos % _C_elembits));
    }

    // 23.3.5.2, p??
    reference operator[] (_RWSTD_SIZE_T __pos) _THROWS (()) {
        _RWSTD_ASSERT (_C_valid_pos (__pos));
        return reference (*this, __pos);
    }

    // 23.3.5.2, p31
    unsigned long to_ulong () const;

#if    !defined (_RWSTD_NO_MEMBER_TEMPLATES) \
    && !defined (_RWSTD_NO_TEMPLATE_ON_RETURN_TYPE) \
    && !defined (_RWSTD_NO_MEMBER_TEMPLATE_OVERLOAD)

    // 23.3.5.2, p33
    template <class _CharT, class _Traits, class _Allocator>
    basic_string<_CharT, _Traits, _Allocator>
    to_string (_CharT = '0', _CharT = '1') const;

# define _RWSTD_BITSET_TO_STRING(charT, Traits) \
    template to_string<charT, Traits, allocator <charT> >()

#  ifndef _RWSTD_NO_EXT_BITSET_TO_STRING

    // convenience extensions
    template <class _CharT, class _Traits>
    basic_string<_CharT, _Traits, allocator<_CharT> >
    to_string (_CharT __b0 = '0', _CharT __b1 = '1') const {
        return to_string<_CharT, _Traits, allocator<_CharT> >(__b0, __b1);
    }

    template <class _CharT>
    basic_string<_CharT, char_traits<_CharT>, allocator<_CharT> >
    to_string (_CharT __b0 = '0', _CharT __b1 = '1') const {
        return to_string<_CharT, char_traits<_CharT>, allocator<_CharT> >
            (__b0, __b1);
    }

    basic_string<char, char_traits<char>, allocator<char> >
    to_string (char __b0 = '0', char __b1 = '1') const {
        return to_string<char, char_traits<char>, allocator<char> >
            (__b0, __b1);
    }

#  endif   // !_NO_EXT_BITSET_TO_STRING

#else   // if _MEMBER_TEMPLATES || _NO_TEMPLATE_ON_RETURN_TYPE || ...

    // 23.3.5.2, p33
    string to_string (char = '0', char = '1') const;

# define _RWSTD_BITSET_TO_STRING(ign1, ign2)  to_string ()

#endif   // !_NO_MEMBER_TEMPLATES && !_NO_TEMPLATE_ON_RETURN_TYPE && ...

    // 23.3.5.2, p35
    _RWSTD_SIZE_T count () const _THROWS (()) {
        return _Size ? _RW::__rw_bit_count (_C_bits, _C_nelems) : 0;
    }

    // 23.3.5.2, p36
    _RWSTD_SIZE_T size () const _THROWS (()) {
        return _Size;
    }

    // 23.3.5.2, p37
    bool operator== (const bitset& __rhs) const _THROWS (()) {
        for (_RWSTD_SIZE_T __i = 0; __i != _C_nelems; ++__i)
            if (_C_bits [__i] != __rhs._C_bits [__i])
                return false;
        return true;
    }

    // 23.3.5.2, p38
    bool operator!= (const bitset& __rhs) const _THROWS (()) {
        return !(*this == __rhs);
    }

    // 23.3.5.2, p39
    bool test (_RWSTD_SIZE_T __pos) const {
        _RWSTD_REQUIRES (_C_valid_pos (__pos),
                         (_RWSTD_ERROR_OUT_OF_RANGE,
                          _RWSTD_FUNC ("bitset::test(size_t) const"),
                          __pos, _C_nelems));

        return !!(_C_bits [__pos / _C_elembits] & (1UL << __pos % _C_elembits));
    }

    // 23.3.5.2, p42
    bool any () const _THROWS (()) {
        for (_RWSTD_SIZE_T __i = 0; __i != _C_nelems; ++__i)
            if (_C_bits [__i])
                return true;
        return false;
    }

    // 23.3.5.2, p43
    bool none () const _THROWS (()) {
        return !any ();
    }

    // 23.3.5.2, p44
    bitset operator<< (_RWSTD_SIZE_T __pos) const _THROWS (()) {
        return bitset (*this) <<= __pos;
    }

    // 23.3.5.2, p45
    bitset operator>> (_RWSTD_SIZE_T __pos) const _THROWS (()) {
        return bitset (*this) >>= __pos;
    }
};


// 23.3.5.2, p11
template <_RWSTD_SIZE_T _Size>
inline bitset<_Size>&
bitset<_Size>::set () _THROWS (())
{
    if (_C_nelems == 1)
        _C_bits [0] = _RWSTD_ULONG_MAX;
    else
        _RWSTD_MEMSET (_C_bits, -1, sizeof _C_bits);

    _C_bits [_C_nelems - !!_C_nelems] >>=
        (_C_elembits - _Size % _C_elembits) % _C_elembits;

    return *this;
}


// 23.3.5.2, p13
template <_RWSTD_SIZE_T _Size>
inline bitset<_Size>&
bitset<_Size>::set (_RWSTD_SIZE_T __pos, bool __val)
{
    _RWSTD_REQUIRES (_C_valid_pos (__pos),
                     (_RWSTD_ERROR_OUT_OF_RANGE,
                      _RWSTD_FUNC ("bitset::set(size_t, bool)"),
                      __pos, _C_nelems));

    if (__val)
        _C_bits [__pos / _C_elembits] |=  (1UL << __pos % _C_elembits);
    else
        _C_bits [__pos / _C_elembits] &= ~(1UL << __pos % _C_elembits);
    return *this;
}


// 23.3.5.2, p7
template <_RWSTD_SIZE_T _Size>
inline bitset<_Size>&
bitset<_Size>::operator<<= (_RWSTD_SIZE_T __n) _THROWS (())
{
    if (_Size >= _C_elembits)
        _RW::__rw_shl (_C_bits, _C_nelems, __n);
    else
        // prevent shifting by sizeof (_C_bits) * CHAR_BIT (undefined)
        _C_bits [0] <<= __n;

    // clear bits shifted past the MSB
    if (_Size % _C_elembits) {
        // prevent warnings about shifting too far
        _C_bits [_C_nelems - !!_C_nelems] &=
          _RWSTD_ULONG_MAX >> (_C_elembits - _Size % _C_elembits) % _C_elembits;
    }

    return *this;
}


// 23.3.5.2, p9
template <_RWSTD_SIZE_T _Size>
inline bitset<_Size>&
bitset<_Size>::operator>>= (_RWSTD_SIZE_T __n) _THROWS (())
{
    if (_Size >= _C_elembits)
        _RW::__rw_shr (_C_bits, _C_nelems, __n);
    else
        // prevent shifting by sizeof (_C_bits) * CHAR_BIT (undefined)
        _C_bits [0] >>= __n;
    return *this;
}


// 23.3.5.2, p31
template <_RWSTD_SIZE_T _Size>
inline unsigned long
bitset<_Size>::to_ulong () const
{
    // add 1 to prevent warnings about pointless comparison with 0
    for (_RWSTD_SIZE_T __i = 1; __i + 1 < _C_nelems + 1; ++__i)
        _RWSTD_REQUIRES (!_C_bits[__i],
                         (_RWSTD_ERROR_OVERFLOW_ERROR,
                          _RWSTD_FUNC ("bitset::to_ulong() const")));

    return _C_bits [0];
}


#if    !defined (_RWSTD_NO_MEMBER_TEMPLATES) \
    && !defined (_RWSTD_NO_TEMPLATE_ON_RETURN_TYPE) \
    && !defined (_RWSTD_NO_MEMBER_TEMPLATE_OVERLOAD)

// 23.3.5.2, p33
template <_RWSTD_SIZE_T _Size>
template <class _CharT, class _Traits, class _Allocator>
inline basic_string<_CharT, _Traits, _Allocator>
bitset<_Size>::
to_string (_CharT __b0 /* = '0' */, _CharT __b1 /* = '1' */) const
{
    // extension: allocate but do not initialize
    basic_string<_CharT, _Traits, _Allocator> __s ((_CharT*)0, _Size);

    for (_RWSTD_SIZE_T __i = 0; __i != _Size; ++__i)
        _Traits::assign (__s [_Size - 1 - __i], (*this)[__i] ? __b1 : __b0);

    return __s;
}

#else   // _NO_MEMBER_TEMPLATES || _NO_TEMPLATE_ON_RETURN_TYPE ...

// 23.3.5.2, p33
template <_RWSTD_SIZE_T _Size>
inline string
bitset<_Size>::
to_string (char __b0 /* = '0' */, char __b1 /* = '1' */) const
{
    // extension: allocate but do not initialize
    string __s ((char*)0, _Size);

    for (_RWSTD_SIZE_T __i = 0; __i != _Size; ++__i)
        __s [_Size - 1 - __i] = (*this)[__i] ? __b1 : __b0;

    return __s;
}

#endif   // !_NO_MEMBER_TEMPLATES && !_NO_TEMPLATE_ON_RETURN_TYPE ...


// 23.3.5.3, p1
template <_RWSTD_SIZE_T _Size>
inline bitset<_Size>
operator& (const bitset<_Size>& __lhs, const bitset<_Size>& __rhs) _THROWS (())
{
    return bitset<_Size>(__lhs) &= __rhs;
}


// 23.3.5.3, p2
template <_RWSTD_SIZE_T _Size>
inline bitset<_Size>
operator| (const bitset<_Size>& __lhs, const bitset<_Size>& __rhs) _THROWS (())
{
    return bitset<_Size>(__lhs) |= __rhs;
}


// 23.3.5.3, p3
template <_RWSTD_SIZE_T _Size>
inline bitset<_Size>
operator^ (const bitset<_Size>& __lhs, const bitset<_Size>& __rhs) _THROWS (())
{
    return bitset<_Size>(__lhs) ^= __rhs;
}


}   // namespace std

_RWSTD_NAMESPACE (__rw) {

_EXPORT
template <_RWSTD_SIZE_T _Size, class _CharT, class _Traits>
_STD::basic_istream<_CharT, _Traits>&
__rw_extract_bitset (_STD::basic_istream<_CharT, _Traits>&,
                     _STD::bitset<_Size>&);

}   // namespace __rw


#if !defined (_MSC_VER) || _MSC_VER > 1300

_RWSTD_NAMESPACE (std) {

// 23.3.5.3, p8
template <class _CharT, class _Traits, _RWSTD_SIZE_T _Size>
inline basic_ostream<_CharT, _Traits>&
operator<< (basic_ostream<_CharT, _Traits>& __os, const bitset<_Size>& __x)
{
    return __os << __x._RWSTD_BITSET_TO_STRING (_CharT, _Traits);
}


// 23.3.5.3, p4
template <class _CharT, class _Traits, _RWSTD_SIZE_T _Size>
inline basic_istream<_CharT, _Traits>&
operator>> (basic_istream<_CharT, _Traits>& __strm, bitset<_Size>& __x)
{
    return _RW::__rw_extract_bitset (__strm, __x);
}

}   // namespace std

#else   // if defined (_MSC_VER) && _MSC_VER <= 1300

#  include <ostream>

_RWSTD_NAMESPACE (std) {

// MSVC 6.0 fails to compile (and with a fix to generate code) for the call
// to extract_bitset below if `Size' is the last template parameter

typedef _RWSTD_SIZE_T _Size_t;   // prevent an MSVC 6.0 ICE

template <_Size_t _Size, class _CharT, class _Traits>
inline basic_istream<_CharT, _Traits>&
operator>> (basic_istream<_CharT, _Traits>& __strm, bitset<_Size>& __x)
{
    return _RW::__rw_extract_bitset (__strm, __x);
}

template <_Size_t _Size>
inline ostream& operator<< (ostream &__strm, const bitset<_Size>& __x)
{
    return __strm << __x._RWSTD_BITSET_TO_STRING (char, char_traits<char>);
}

template <_Size_t _Size>
inline wostream& operator<< (wostream &__strm, const bitset<_Size>& __x)
{
    const string __s = __x._RWSTD_BITSET_TO_STRING (char, char_traits<char>);
    wstring __tmp (0, __s.length ());   // extension: allocate uninitialzed
    for (string::size_type __i = 0; __i != __tmp.size (); ++__i)
        __tmp [__i] = __s [__i];
    return __strm << __tmp;
}

}   // namespace std

#endif   // !defined (_MSC_VER) || _MSC_VER > 1300


#ifdef _RWSTD_NO_IMPLICIT_INCLUSION
#  include <bitset.cc>
#endif


#endif   // _RWSTD_BITSET_INCLUDED