bitset revision 262801 
1// -*- C++ -*-
2//===---------------------------- bitset ----------------------------------===//
3//
4//                     The LLVM Compiler Infrastructure
5//
6// This file is dual licensed under the MIT and the University of Illinois Open
7// Source Licenses. See LICENSE.TXT for details.
8//
9//===----------------------------------------------------------------------===//
10
11#ifndef _LIBCPP_BITSET
12#define _LIBCPP_BITSET
13
14/*
15    bitset synopsis
16
17namespace std
18{
19
20namespace std {
21
22template <size_t N>
23class bitset
24{
25public:
26    // bit reference:
27    class reference
28    {
29        friend class bitset;
30        reference() noexcept;
31    public:
32        ~reference() noexcept;
33        reference& operator=(bool x) noexcept;           // for b[i] = x;
34        reference& operator=(const reference&) noexcept; // for b[i] = b[j];
35        bool operator~() const noexcept;                 // flips the bit
36        operator bool() const noexcept;                  // for x = b[i];
37        reference& flip() noexcept;                      // for b[i].flip();
38    };
39
40    // 23.3.5.1 constructors:
41    constexpr bitset() noexcept;
42    constexpr bitset(unsigned long long val) noexcept;
43    template <class charT>
44        explicit bitset(const charT* str,
45                        typename basic_string<charT>::size_type n = basic_string<charT>::npos,
46                        charT zero = charT('0'), charT one = charT('1'));
47    template<class charT, class traits, class Allocator>
48        explicit bitset(const basic_string<charT,traits,Allocator>& str,
49                        typename basic_string<charT,traits,Allocator>::size_type pos = 0,
50                        typename basic_string<charT,traits,Allocator>::size_type n =
51                                 basic_string<charT,traits,Allocator>::npos,
52                        charT zero = charT('0'), charT one = charT('1'));
53
54    // 23.3.5.2 bitset operations:
55    bitset& operator&=(const bitset& rhs) noexcept;
56    bitset& operator|=(const bitset& rhs) noexcept;
57    bitset& operator^=(const bitset& rhs) noexcept;
58    bitset& operator<<=(size_t pos) noexcept;
59    bitset& operator>>=(size_t pos) noexcept;
60    bitset& set() noexcept;
61    bitset& set(size_t pos, bool val = true);
62    bitset& reset() noexcept;
63    bitset& reset(size_t pos);
64    bitset operator~() const noexcept;
65    bitset& flip() noexcept;
66    bitset& flip(size_t pos);
67
68    // element access:
69    constexpr bool operator[](size_t pos) const; // for b[i];
70    reference operator[](size_t pos);            // for b[i];
71    unsigned long to_ulong() const;
72    unsigned long long to_ullong() const;
73    template <class charT, class traits, class Allocator>
74        basic_string<charT, traits, Allocator> to_string(charT zero = charT('0'), charT one = charT('1')) const;
75    template <class charT, class traits>
76        basic_string<charT, traits, allocator<charT> > to_string(charT zero = charT('0'), charT one = charT('1')) const;
77    template <class charT>
78        basic_string<charT, char_traits<charT>, allocator<charT> > to_string(charT zero = charT('0'), charT one = charT('1')) const;
79    basic_string<char, char_traits<char>, allocator<char> > to_string(char zero = '0', char one = '1') const;
80    size_t count() const noexcept;
81    constexpr size_t size() const noexcept;
82    bool operator==(const bitset& rhs) const noexcept;
83    bool operator!=(const bitset& rhs) const noexcept;
84    bool test(size_t pos) const;
85    bool all() const noexcept;
86    bool any() const noexcept;
87    bool none() const noexcept;
88    bitset operator<<(size_t pos) const noexcept;
89    bitset operator>>(size_t pos) const noexcept;
90};
91
92// 23.3.5.3 bitset operators:
93template <size_t N>
94bitset<N> operator&(const bitset<N>&, const bitset<N>&) noexcept;
95
96template <size_t N>
97bitset<N> operator|(const bitset<N>&, const bitset<N>&) noexcept;
98
99template <size_t N>
100bitset<N> operator^(const bitset<N>&, const bitset<N>&) noexcept;
101
102template <class charT, class traits, size_t N>
103basic_istream<charT, traits>&
104operator>>(basic_istream<charT, traits>& is, bitset<N>& x);
105
106template <class charT, class traits, size_t N>
107basic_ostream<charT, traits>&
108operator<<(basic_ostream<charT, traits>& os, const bitset<N>& x);
109
110template <size_t N> struct hash<std::bitset<N>>;
111
112}  // std
113
114*/
115
116#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
117#pragma GCC system_header
118#endif
119
120#include <__config>
121#include <__bit_reference>
122#include <cstddef>
123#include <climits>
124#include <string>
125#include <stdexcept>
126#include <iosfwd>
127#include <__functional_base>
128#if defined(_LIBCPP_NO_EXCEPTIONS)
129    #include <cassert>
130#endif
131
132#include <__undef_min_max>
133
134_LIBCPP_BEGIN_NAMESPACE_STD
135
136template <size_t _N_words, size_t _Size>
137class __bitset;
138
139template <size_t _N_words, size_t _Size>
140struct __has_storage_type<__bitset<_N_words, _Size> >
141{
142    static const bool value = true;
143};
144
145template <size_t _N_words, size_t _Size>
146class __bitset
147{
148public:
149    typedef ptrdiff_t              difference_type;
150    typedef size_t                 size_type;
151    typedef size_type              __storage_type;
152protected:
153    typedef __bitset __self;
154    typedef       __storage_type*  __storage_pointer;
155    typedef const __storage_type*  __const_storage_pointer;
156    static const unsigned __bits_per_word = static_cast<unsigned>(sizeof(__storage_type) * CHAR_BIT);
157
158    friend class __bit_reference<__bitset>;
159    friend class __bit_const_reference<__bitset>;
160    friend class __bit_iterator<__bitset, false>;
161    friend class __bit_iterator<__bitset, true>;
162    friend struct __bit_array<__bitset>;
163
164    __storage_type __first_[_N_words];
165
166    typedef __bit_reference<__bitset>                  reference;
167    typedef __bit_const_reference<__bitset>            const_reference;
168    typedef __bit_iterator<__bitset, false>            iterator;
169    typedef __bit_iterator<__bitset, true>             const_iterator;
170
171    _LIBCPP_CONSTEXPR __bitset() _NOEXCEPT;
172    explicit _LIBCPP_CONSTEXPR __bitset(unsigned long long __v) _NOEXCEPT;
173
174    _LIBCPP_INLINE_VISIBILITY reference __make_ref(size_t __pos) _NOEXCEPT
175        {return reference(__first_ + __pos / __bits_per_word, __storage_type(1) << __pos % __bits_per_word);}
176    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR const_reference __make_ref(size_t __pos) const _NOEXCEPT
177        {return const_reference(__first_ + __pos / __bits_per_word, __storage_type(1) << __pos % __bits_per_word);}
178    _LIBCPP_INLINE_VISIBILITY iterator __make_iter(size_t __pos) _NOEXCEPT
179        {return iterator(__first_ + __pos / __bits_per_word, __pos % __bits_per_word);}
180    _LIBCPP_INLINE_VISIBILITY const_iterator __make_iter(size_t __pos) const _NOEXCEPT
181        {return const_iterator(__first_ + __pos / __bits_per_word, __pos % __bits_per_word);}
182
183    void operator&=(const __bitset& __v) _NOEXCEPT;
184    void operator|=(const __bitset& __v) _NOEXCEPT;
185    void operator^=(const __bitset& __v) _NOEXCEPT;
186
187    void flip() _NOEXCEPT;
188    _LIBCPP_INLINE_VISIBILITY unsigned long to_ulong() const
189        {return to_ulong(integral_constant<bool, _Size < sizeof(unsigned long) * CHAR_BIT>());}
190    _LIBCPP_INLINE_VISIBILITY unsigned long long to_ullong() const
191        {return to_ullong(integral_constant<bool, _Size < sizeof(unsigned long long) * CHAR_BIT>());}
192
193    bool all() const _NOEXCEPT;
194    bool any() const _NOEXCEPT;
195    size_t __hash_code() const _NOEXCEPT;
196private:
197#ifdef _LIBCPP_HAS_NO_CONSTEXPR
198    void __init(unsigned long long __v, false_type) _NOEXCEPT;
199    void __init(unsigned long long __v, true_type) _NOEXCEPT;
200#endif  // _LIBCPP_HAS_NO_CONSTEXPR
201    unsigned long to_ulong(false_type) const;
202    unsigned long to_ulong(true_type) const;
203    unsigned long long to_ullong(false_type) const;
204    unsigned long long to_ullong(true_type) const;
205    unsigned long long to_ullong(true_type, false_type) const;
206    unsigned long long to_ullong(true_type, true_type) const;
207};
208
209template <size_t _N_words, size_t _Size>
210inline _LIBCPP_INLINE_VISIBILITY
211_LIBCPP_CONSTEXPR
212__bitset<_N_words, _Size>::__bitset() _NOEXCEPT
213#ifndef _LIBCPP_HAS_NO_CONSTEXPR
214    : __first_{0}
215#endif
216{
217#ifdef _LIBCPP_HAS_NO_CONSTEXPR
218    _VSTD::fill_n(__first_, _N_words, __storage_type(0));
219#endif
220}
221
222#ifdef _LIBCPP_HAS_NO_CONSTEXPR
223
224template <size_t _N_words, size_t _Size>
225void
226__bitset<_N_words, _Size>::__init(unsigned long long __v, false_type) _NOEXCEPT
227{
228    __storage_type __t[sizeof(unsigned long long) / sizeof(__storage_type)];
229    for (size_t __i = 0; __i < sizeof(__t)/sizeof(__t[0]); ++__i, __v >>= __bits_per_word)
230        __t[__i] = static_cast<__storage_type>(__v);
231    _VSTD::copy(__t, __t + sizeof(__t)/sizeof(__t[0]), __first_);
232    _VSTD::fill(__first_ + sizeof(__t)/sizeof(__t[0]), __first_ + sizeof(__first_)/sizeof(__first_[0]),
233               __storage_type(0));
234}
235
236template <size_t _N_words, size_t _Size>
237inline _LIBCPP_INLINE_VISIBILITY
238void
239__bitset<_N_words, _Size>::__init(unsigned long long __v, true_type) _NOEXCEPT
240{
241    __first_[0] = __v;
242    _VSTD::fill(__first_ + 1, __first_ + sizeof(__first_)/sizeof(__first_[0]), __storage_type(0));
243}
244
245#endif  // _LIBCPP_HAS_NO_CONSTEXPR
246
247template <size_t _N_words, size_t _Size>
248inline _LIBCPP_INLINE_VISIBILITY
249_LIBCPP_CONSTEXPR
250__bitset<_N_words, _Size>::__bitset(unsigned long long __v) _NOEXCEPT
251#ifndef _LIBCPP_HAS_NO_CONSTEXPR
252#if __SIZE_WIDTH__ == 64
253    : __first_{__v}
254#elif __SIZE_WIDTH__ == 32
255    : __first_{__v, __v >> __bits_per_word}
256#else
257#error This constructor has not been ported to this platform
258#endif
259#endif
260{
261#ifdef _LIBCPP_HAS_NO_CONSTEXPR
262    __init(__v, integral_constant<bool, sizeof(unsigned long long) == sizeof(__storage_type)>());
263#endif
264}
265
266template <size_t _N_words, size_t _Size>
267inline _LIBCPP_INLINE_VISIBILITY
268void
269__bitset<_N_words, _Size>::operator&=(const __bitset& __v) _NOEXCEPT
270{
271    for (size_type __i = 0; __i < _N_words; ++__i)
272        __first_[__i] &= __v.__first_[__i];
273}
274
275template <size_t _N_words, size_t _Size>
276inline _LIBCPP_INLINE_VISIBILITY
277void
278__bitset<_N_words, _Size>::operator|=(const __bitset& __v) _NOEXCEPT
279{
280    for (size_type __i = 0; __i < _N_words; ++__i)
281        __first_[__i] |= __v.__first_[__i];
282}
283
284template <size_t _N_words, size_t _Size>
285inline _LIBCPP_INLINE_VISIBILITY
286void
287__bitset<_N_words, _Size>::operator^=(const __bitset& __v) _NOEXCEPT
288{
289    for (size_type __i = 0; __i < _N_words; ++__i)
290        __first_[__i] ^= __v.__first_[__i];
291}
292
293template <size_t _N_words, size_t _Size>
294void
295__bitset<_N_words, _Size>::flip() _NOEXCEPT
296{
297    // do middle whole words
298    size_type __n = _Size;
299    __storage_pointer __p = __first_;
300    for (; __n >= __bits_per_word; ++__p, __n -= __bits_per_word)
301        *__p = ~*__p;
302    // do last partial word
303    if (__n > 0)
304    {
305        __storage_type __m = ~__storage_type(0) >> (__bits_per_word - __n);
306        __storage_type __b = *__p & __m;
307        *__p &= ~__m;
308        *__p |= ~__b & __m;
309    }
310}
311
312template <size_t _N_words, size_t _Size>
313unsigned long
314__bitset<_N_words, _Size>::to_ulong(false_type) const
315{
316    const_iterator __e = __make_iter(_Size);
317    const_iterator __i = _VSTD::find(__make_iter(sizeof(unsigned long) * CHAR_BIT), __e, true);
318    if (__i != __e)
319#ifndef _LIBCPP_NO_EXCEPTIONS
320        throw overflow_error("bitset to_ulong overflow error");
321#else
322        assert(!"bitset to_ulong overflow error");
323#endif
324    return __first_[0];
325}
326
327template <size_t _N_words, size_t _Size>
328inline _LIBCPP_INLINE_VISIBILITY
329unsigned long
330__bitset<_N_words, _Size>::to_ulong(true_type) const
331{
332    return __first_[0];
333}
334
335template <size_t _N_words, size_t _Size>
336unsigned long long
337__bitset<_N_words, _Size>::to_ullong(false_type) const
338{
339    const_iterator __e = __make_iter(_Size);
340    const_iterator __i = _VSTD::find(__make_iter(sizeof(unsigned long long) * CHAR_BIT), __e, true);
341    if (__i != __e)
342#ifndef _LIBCPP_NO_EXCEPTIONS
343        throw overflow_error("bitset to_ullong overflow error");
344#else
345        assert(!"bitset to_ullong overflow error");
346#endif
347    return to_ullong(true_type());
348}
349
350template <size_t _N_words, size_t _Size>
351inline _LIBCPP_INLINE_VISIBILITY
352unsigned long long
353__bitset<_N_words, _Size>::to_ullong(true_type) const
354{
355    return to_ullong(true_type(), integral_constant<bool, sizeof(__storage_type) < sizeof(unsigned long long)>());
356}
357
358template <size_t _N_words, size_t _Size>
359inline _LIBCPP_INLINE_VISIBILITY
360unsigned long long
361__bitset<_N_words, _Size>::to_ullong(true_type, false_type) const
362{
363    return __first_[0];
364}
365
366template <size_t _N_words, size_t _Size>
367unsigned long long
368__bitset<_N_words, _Size>::to_ullong(true_type, true_type) const
369{
370    unsigned long long __r = __first_[0];
371    for (std::size_t __i = 1; __i < sizeof(unsigned long long) / sizeof(__storage_type); ++__i)
372        __r |= static_cast<unsigned long long>(__first_[__i]) << (sizeof(__storage_type) * CHAR_BIT);
373    return __r;
374}
375
376template <size_t _N_words, size_t _Size>
377bool
378__bitset<_N_words, _Size>::all() const _NOEXCEPT
379{
380    // do middle whole words
381    size_type __n = _Size;
382    __const_storage_pointer __p = __first_;
383    for (; __n >= __bits_per_word; ++__p, __n -= __bits_per_word)
384        if (~*__p)
385            return false;
386    // do last partial word
387    if (__n > 0)
388    {
389        __storage_type __m = ~__storage_type(0) >> (__bits_per_word - __n);
390        if (~*__p & __m)
391            return false;
392    }
393    return true;
394}
395
396template <size_t _N_words, size_t _Size>
397bool
398__bitset<_N_words, _Size>::any() const _NOEXCEPT
399{
400    // do middle whole words
401    size_type __n = _Size;
402    __const_storage_pointer __p = __first_;
403    for (; __n >= __bits_per_word; ++__p, __n -= __bits_per_word)
404        if (*__p)
405            return true;
406    // do last partial word
407    if (__n > 0)
408    {
409        __storage_type __m = ~__storage_type(0) >> (__bits_per_word - __n);
410        if (*__p & __m)
411            return true;
412    }
413    return false;
414}
415
416template <size_t _N_words, size_t _Size>
417inline _LIBCPP_INLINE_VISIBILITY
418size_t
419__bitset<_N_words, _Size>::__hash_code() const _NOEXCEPT
420{
421    size_t __h = 0;
422    for (size_type __i = 0; __i < _N_words; ++__i)
423        __h ^= __first_[__i];
424    return __h;
425}
426
427template <size_t _Size>
428class __bitset<1, _Size>
429{
430public:
431    typedef ptrdiff_t              difference_type;
432    typedef size_t                 size_type;
433    typedef size_type              __storage_type;
434protected:
435    typedef __bitset __self;
436    typedef       __storage_type*  __storage_pointer;
437    typedef const __storage_type*  __const_storage_pointer;
438    static const unsigned __bits_per_word = static_cast<unsigned>(sizeof(__storage_type) * CHAR_BIT);
439
440    friend class __bit_reference<__bitset>;
441    friend class __bit_const_reference<__bitset>;
442    friend class __bit_iterator<__bitset, false>;
443    friend class __bit_iterator<__bitset, true>;
444    friend struct __bit_array<__bitset>;
445
446    __storage_type __first_;
447
448    typedef __bit_reference<__bitset>                  reference;
449    typedef __bit_const_reference<__bitset>            const_reference;
450    typedef __bit_iterator<__bitset, false>            iterator;
451    typedef __bit_iterator<__bitset, true>             const_iterator;
452
453    _LIBCPP_CONSTEXPR __bitset() _NOEXCEPT;
454    explicit _LIBCPP_CONSTEXPR __bitset(unsigned long long __v) _NOEXCEPT;
455
456    _LIBCPP_INLINE_VISIBILITY reference __make_ref(size_t __pos) _NOEXCEPT
457        {return reference(&__first_, __storage_type(1) << __pos);}
458    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR const_reference __make_ref(size_t __pos) const _NOEXCEPT
459        {return const_reference(&__first_, __storage_type(1) << __pos);}
460    _LIBCPP_INLINE_VISIBILITY iterator __make_iter(size_t __pos) _NOEXCEPT
461        {return iterator(&__first_ + __pos / __bits_per_word, __pos % __bits_per_word);}
462    _LIBCPP_INLINE_VISIBILITY const_iterator __make_iter(size_t __pos) const _NOEXCEPT
463        {return const_iterator(&__first_ + __pos / __bits_per_word, __pos % __bits_per_word);}
464
465    void operator&=(const __bitset& __v) _NOEXCEPT;
466    void operator|=(const __bitset& __v) _NOEXCEPT;
467    void operator^=(const __bitset& __v) _NOEXCEPT;
468
469    void flip() _NOEXCEPT;
470
471    unsigned long to_ulong() const;
472    unsigned long long to_ullong() const;
473
474    bool all() const _NOEXCEPT;
475    bool any() const _NOEXCEPT;
476
477    size_t __hash_code() const _NOEXCEPT;
478};
479
480template <size_t _Size>
481inline _LIBCPP_INLINE_VISIBILITY
482_LIBCPP_CONSTEXPR
483__bitset<1, _Size>::__bitset() _NOEXCEPT
484    : __first_(0)
485{
486}
487
488template <size_t _Size>
489inline _LIBCPP_INLINE_VISIBILITY
490_LIBCPP_CONSTEXPR
491__bitset<1, _Size>::__bitset(unsigned long long __v) _NOEXCEPT
492    : __first_(static_cast<__storage_type>(__v))
493{
494}
495
496template <size_t _Size>
497inline _LIBCPP_INLINE_VISIBILITY
498void
499__bitset<1, _Size>::operator&=(const __bitset& __v) _NOEXCEPT
500{
501    __first_ &= __v.__first_;
502}
503
504template <size_t _Size>
505inline _LIBCPP_INLINE_VISIBILITY
506void
507__bitset<1, _Size>::operator|=(const __bitset& __v) _NOEXCEPT
508{
509    __first_ |= __v.__first_;
510}
511
512template <size_t _Size>
513inline _LIBCPP_INLINE_VISIBILITY
514void
515__bitset<1, _Size>::operator^=(const __bitset& __v) _NOEXCEPT
516{
517    __first_ ^= __v.__first_;
518}
519
520template <size_t _Size>
521inline _LIBCPP_INLINE_VISIBILITY
522void
523__bitset<1, _Size>::flip() _NOEXCEPT
524{
525    __storage_type __m = ~__storage_type(0) >> (__bits_per_word - _Size);
526    __first_ = ~__first_;
527    __first_ &= __m;
528}
529
530template <size_t _Size>
531inline _LIBCPP_INLINE_VISIBILITY
532unsigned long
533__bitset<1, _Size>::to_ulong() const
534{
535    return __first_;
536}
537
538template <size_t _Size>
539inline _LIBCPP_INLINE_VISIBILITY
540unsigned long long
541__bitset<1, _Size>::to_ullong() const
542{
543    return __first_;
544}
545
546template <size_t _Size>
547inline _LIBCPP_INLINE_VISIBILITY
548bool
549__bitset<1, _Size>::all() const _NOEXCEPT
550{
551    __storage_type __m = ~__storage_type(0) >> (__bits_per_word - _Size);
552    return !(~__first_ & __m);
553}
554
555template <size_t _Size>
556inline _LIBCPP_INLINE_VISIBILITY
557bool
558__bitset<1, _Size>::any() const _NOEXCEPT
559{
560    __storage_type __m = ~__storage_type(0) >> (__bits_per_word - _Size);
561    return __first_ & __m;
562}
563
564template <size_t _Size>
565inline _LIBCPP_INLINE_VISIBILITY
566size_t
567__bitset<1, _Size>::__hash_code() const _NOEXCEPT
568{
569    return __first_;
570}
571
572template <>
573class __bitset<0, 0>
574{
575public:
576    typedef ptrdiff_t              difference_type;
577    typedef size_t                 size_type;
578    typedef size_type              __storage_type;
579protected:
580    typedef __bitset __self;
581    typedef       __storage_type*  __storage_pointer;
582    typedef const __storage_type*  __const_storage_pointer;
583    static const unsigned __bits_per_word = static_cast<unsigned>(sizeof(__storage_type) * CHAR_BIT);
584
585    friend class __bit_reference<__bitset>;
586    friend class __bit_const_reference<__bitset>;
587    friend class __bit_iterator<__bitset, false>;
588    friend class __bit_iterator<__bitset, true>;
589    friend struct __bit_array<__bitset>;
590
591    typedef __bit_reference<__bitset>                  reference;
592    typedef __bit_const_reference<__bitset>            const_reference;
593    typedef __bit_iterator<__bitset, false>            iterator;
594    typedef __bit_iterator<__bitset, true>             const_iterator;
595
596    _LIBCPP_CONSTEXPR __bitset() _NOEXCEPT;
597    explicit _LIBCPP_CONSTEXPR __bitset(unsigned long long) _NOEXCEPT;
598
599    _LIBCPP_INLINE_VISIBILITY reference __make_ref(size_t) _NOEXCEPT
600        {return reference(0, 1);}
601    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR const_reference __make_ref(size_t) const _NOEXCEPT
602        {return const_reference(0, 1);}
603    _LIBCPP_INLINE_VISIBILITY iterator __make_iter(size_t) _NOEXCEPT
604        {return iterator(0, 0);}
605    _LIBCPP_INLINE_VISIBILITY const_iterator __make_iter(size_t) const _NOEXCEPT
606        {return const_iterator(0, 0);}
607
608    _LIBCPP_INLINE_VISIBILITY void operator&=(const __bitset&) _NOEXCEPT {}
609    _LIBCPP_INLINE_VISIBILITY void operator|=(const __bitset&) _NOEXCEPT {}
610    _LIBCPP_INLINE_VISIBILITY void operator^=(const __bitset&) _NOEXCEPT {}
611
612    _LIBCPP_INLINE_VISIBILITY void flip() _NOEXCEPT {}
613
614    _LIBCPP_INLINE_VISIBILITY unsigned long to_ulong() const {return 0;}
615    _LIBCPP_INLINE_VISIBILITY unsigned long long to_ullong() const {return 0;}
616
617    _LIBCPP_INLINE_VISIBILITY bool all() const _NOEXCEPT {return true;}
618    _LIBCPP_INLINE_VISIBILITY bool any() const _NOEXCEPT {return false;}
619
620    _LIBCPP_INLINE_VISIBILITY size_t __hash_code() const _NOEXCEPT {return 0;}
621};
622
623inline _LIBCPP_INLINE_VISIBILITY
624_LIBCPP_CONSTEXPR
625__bitset<0, 0>::__bitset() _NOEXCEPT
626{
627}
628
629inline _LIBCPP_INLINE_VISIBILITY
630_LIBCPP_CONSTEXPR
631__bitset<0, 0>::__bitset(unsigned long long) _NOEXCEPT
632{
633}
634
635template <size_t _Size> class _LIBCPP_TYPE_VIS_ONLY bitset;
636template <size_t _Size> struct _LIBCPP_TYPE_VIS_ONLY hash<bitset<_Size> >;
637
638template <size_t _Size>
639class _LIBCPP_TYPE_VIS_ONLY bitset
640    : private __bitset<_Size == 0 ? 0 : (_Size - 1) / (sizeof(size_t) * CHAR_BIT) + 1, _Size>
641{
642public:
643    static const unsigned __n_words = _Size == 0 ? 0 : (_Size - 1) / (sizeof(size_t) * CHAR_BIT) + 1;
644    typedef __bitset<__n_words, _Size> base;
645
646public:
647    typedef typename base::reference       reference;
648    typedef typename base::const_reference const_reference;
649
650    // 23.3.5.1 constructors:
651    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR bitset() _NOEXCEPT {}
652    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
653        bitset(unsigned long long __v) _NOEXCEPT : base(__v) {}
654    template<class _CharT>
655        explicit bitset(const _CharT* __str,
656                        typename basic_string<_CharT>::size_type __n = basic_string<_CharT>::npos,
657                        _CharT __zero = _CharT('0'), _CharT __one = _CharT('1'));
658    template<class _CharT, class _Traits, class _Allocator>
659        explicit bitset(const basic_string<_CharT,_Traits,_Allocator>& __str,
660                        typename basic_string<_CharT,_Traits,_Allocator>::size_type __pos = 0,
661                        typename basic_string<_CharT,_Traits,_Allocator>::size_type __n =
662                                (basic_string<_CharT,_Traits,_Allocator>::npos),
663                        _CharT __zero = _CharT('0'), _CharT __one = _CharT('1'));
664
665    // 23.3.5.2 bitset operations:
666    bitset& operator&=(const bitset& __rhs) _NOEXCEPT;
667    bitset& operator|=(const bitset& __rhs) _NOEXCEPT;
668    bitset& operator^=(const bitset& __rhs) _NOEXCEPT;
669    bitset& operator<<=(size_t __pos) _NOEXCEPT;
670    bitset& operator>>=(size_t __pos) _NOEXCEPT;
671    bitset& set() _NOEXCEPT;
672    bitset& set(size_t __pos, bool __val = true);
673    bitset& reset() _NOEXCEPT;
674    bitset& reset(size_t __pos);
675    bitset  operator~() const _NOEXCEPT;
676    bitset& flip() _NOEXCEPT;
677    bitset& flip(size_t __pos);
678
679    // element access:
680    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
681                              const_reference operator[](size_t __p) const {return base::__make_ref(__p);}
682    _LIBCPP_INLINE_VISIBILITY       reference operator[](size_t __p)       {return base::__make_ref(__p);}
683    unsigned long to_ulong() const;
684    unsigned long long to_ullong() const;
685    template <class _CharT, class _Traits, class _Allocator>
686        basic_string<_CharT, _Traits, _Allocator> to_string(_CharT __zero = _CharT('0'),
687                                                            _CharT __one = _CharT('1')) const;
688    template <class _CharT, class _Traits>
689        basic_string<_CharT, _Traits, allocator<_CharT> > to_string(_CharT __zero = _CharT('0'),
690                                                                    _CharT __one = _CharT('1')) const;
691    template <class _CharT>
692        basic_string<_CharT, char_traits<_CharT>, allocator<_CharT> > to_string(_CharT __zero = _CharT('0'),
693                                                                                _CharT __one = _CharT('1')) const;
694    basic_string<char, char_traits<char>, allocator<char> > to_string(char __zero = '0',
695                                                                      char __one = '1') const;
696    size_t count() const _NOEXCEPT;
697    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR size_t size() const _NOEXCEPT {return _Size;}
698    bool operator==(const bitset& __rhs) const _NOEXCEPT;
699    bool operator!=(const bitset& __rhs) const _NOEXCEPT;
700    bool test(size_t __pos) const;
701    bool all() const _NOEXCEPT;
702    bool any() const _NOEXCEPT;
703    _LIBCPP_INLINE_VISIBILITY bool none() const _NOEXCEPT {return !any();}
704    bitset operator<<(size_t __pos) const _NOEXCEPT;
705    bitset operator>>(size_t __pos) const _NOEXCEPT;
706
707private:
708
709    _LIBCPP_INLINE_VISIBILITY
710    size_t __hash_code() const _NOEXCEPT {return base::__hash_code();}
711
712    friend struct hash<bitset>;
713};
714
715template <size_t _Size>
716template<class _CharT>
717bitset<_Size>::bitset(const _CharT* __str,
718                      typename basic_string<_CharT>::size_type __n,
719                      _CharT __zero, _CharT __one)
720{
721    size_t __rlen = _VSTD::min(__n, char_traits<_CharT>::length(__str));
722    for (size_t __i = 0; __i < __rlen; ++__i)
723        if (__str[__i] != __zero && __str[__i] != __one)
724#ifndef _LIBCPP_NO_EXCEPTIONS
725            throw invalid_argument("bitset string ctor has invalid argument");
726#else
727            assert(!"bitset string ctor has invalid argument");
728#endif
729    size_t _Mp = _VSTD::min(__rlen, _Size);
730    size_t __i = 0;
731    for (; __i < _Mp; ++__i)
732    {
733        _CharT __c = __str[_Mp - 1 - __i];
734        if (__c == __zero)
735            (*this)[__i] = false;
736        else
737            (*this)[__i] = true;
738    }
739    _VSTD::fill(base::__make_iter(__i), base::__make_iter(_Size), false);
740}
741
742template <size_t _Size>
743template<class _CharT, class _Traits, class _Allocator>
744bitset<_Size>::bitset(const basic_string<_CharT,_Traits,_Allocator>& __str,
745       typename basic_string<_CharT,_Traits,_Allocator>::size_type __pos,
746       typename basic_string<_CharT,_Traits,_Allocator>::size_type __n,
747       _CharT __zero, _CharT __one)
748{
749    if (__pos > __str.size())
750#ifndef _LIBCPP_NO_EXCEPTIONS
751        throw out_of_range("bitset string pos out of range");
752#else
753        assert(!"bitset string pos out of range");
754#endif
755    size_t __rlen = _VSTD::min(__n, __str.size() - __pos);
756    for (size_t __i = __pos; __i < __pos + __rlen; ++__i)
757        if (!_Traits::eq(__str[__i], __zero) && !_Traits::eq(__str[__i], __one))
758#ifndef _LIBCPP_NO_EXCEPTIONS
759            throw invalid_argument("bitset string ctor has invalid argument");
760#else
761            assert(!"bitset string ctor has invalid argument");
762#endif
763    size_t _Mp = _VSTD::min(__rlen, _Size);
764    size_t __i = 0;
765    for (; __i < _Mp; ++__i)
766    {
767        _CharT __c = __str[__pos + _Mp - 1 - __i];
768        if (_Traits::eq(__c, __zero))
769            (*this)[__i] = false;
770        else
771            (*this)[__i] = true;
772    }
773    _VSTD::fill(base::__make_iter(__i), base::__make_iter(_Size), false);
774}
775
776template <size_t _Size>
777inline _LIBCPP_INLINE_VISIBILITY
778bitset<_Size>&
779bitset<_Size>::operator&=(const bitset& __rhs) _NOEXCEPT
780{
781    base::operator&=(__rhs);
782    return *this;
783}
784
785template <size_t _Size>
786inline _LIBCPP_INLINE_VISIBILITY
787bitset<_Size>&
788bitset<_Size>::operator|=(const bitset& __rhs) _NOEXCEPT
789{
790    base::operator|=(__rhs);
791    return *this;
792}
793
794template <size_t _Size>
795inline _LIBCPP_INLINE_VISIBILITY
796bitset<_Size>&
797bitset<_Size>::operator^=(const bitset& __rhs) _NOEXCEPT
798{
799    base::operator^=(__rhs);
800    return *this;
801}
802
803template <size_t _Size>
804bitset<_Size>&
805bitset<_Size>::operator<<=(size_t __pos) _NOEXCEPT
806{
807    __pos = _VSTD::min(__pos, _Size);
808    _VSTD::copy_backward(base::__make_iter(0), base::__make_iter(_Size - __pos), base::__make_iter(_Size));
809    _VSTD::fill_n(base::__make_iter(0), __pos, false);
810    return *this;
811}
812
813template <size_t _Size>
814bitset<_Size>&
815bitset<_Size>::operator>>=(size_t __pos) _NOEXCEPT
816{
817    __pos = _VSTD::min(__pos, _Size);
818    _VSTD::copy(base::__make_iter(__pos), base::__make_iter(_Size), base::__make_iter(0));
819    _VSTD::fill_n(base::__make_iter(_Size - __pos), __pos, false);
820    return *this;
821}
822
823template <size_t _Size>
824inline _LIBCPP_INLINE_VISIBILITY
825bitset<_Size>&
826bitset<_Size>::set() _NOEXCEPT
827{
828    _VSTD::fill_n(base::__make_iter(0), _Size, true);
829    return *this;
830}
831
832template <size_t _Size>
833bitset<_Size>&
834bitset<_Size>::set(size_t __pos, bool __val)
835{
836    if (__pos >= _Size)
837#ifndef _LIBCPP_NO_EXCEPTIONS
838        throw out_of_range("bitset set argument out of range");
839#else
840        assert(!"bitset set argument out of range");
841#endif
842    (*this)[__pos] = __val;
843    return *this;
844}
845
846template <size_t _Size>
847inline _LIBCPP_INLINE_VISIBILITY
848bitset<_Size>&
849bitset<_Size>::reset() _NOEXCEPT
850{
851    _VSTD::fill_n(base::__make_iter(0), _Size, false);
852    return *this;
853}
854
855template <size_t _Size>
856bitset<_Size>&
857bitset<_Size>::reset(size_t __pos)
858{
859    if (__pos >= _Size)
860#ifndef _LIBCPP_NO_EXCEPTIONS
861        throw out_of_range("bitset reset argument out of range");
862#else
863        assert(!"bitset reset argument out of range");
864#endif
865    (*this)[__pos] = false;
866    return *this;
867}
868
869template <size_t _Size>
870inline _LIBCPP_INLINE_VISIBILITY
871bitset<_Size>
872bitset<_Size>::operator~() const _NOEXCEPT
873{
874    bitset __x(*this);
875    __x.flip();
876    return __x;
877}
878
879template <size_t _Size>
880inline _LIBCPP_INLINE_VISIBILITY
881bitset<_Size>&
882bitset<_Size>::flip() _NOEXCEPT
883{
884    base::flip();
885    return *this;
886}
887
888template <size_t _Size>
889bitset<_Size>&
890bitset<_Size>::flip(size_t __pos)
891{
892    if (__pos >= _Size)
893#ifndef _LIBCPP_NO_EXCEPTIONS
894        throw out_of_range("bitset flip argument out of range");
895#else
896        assert(!"bitset flip argument out of range");
897#endif
898    reference r = base::__make_ref(__pos);
899    r = ~r;
900    return *this;
901}
902
903template <size_t _Size>
904inline _LIBCPP_INLINE_VISIBILITY
905unsigned long
906bitset<_Size>::to_ulong() const
907{
908    return base::to_ulong();
909}
910
911template <size_t _Size>
912inline _LIBCPP_INLINE_VISIBILITY
913unsigned long long
914bitset<_Size>::to_ullong() const
915{
916    return base::to_ullong();
917}
918
919template <size_t _Size>
920template <class _CharT, class _Traits, class _Allocator>
921basic_string<_CharT, _Traits, _Allocator>
922bitset<_Size>::to_string(_CharT __zero, _CharT __one) const
923{
924    basic_string<_CharT, _Traits, _Allocator> __r(_Size, __zero);
925    for (size_t __i = 0; __i < _Size; ++__i)
926    {
927        if ((*this)[__i])
928            __r[_Size - 1 - __i] = __one;
929    }
930    return __r;
931}
932
933template <size_t _Size>
934template <class _CharT, class _Traits>
935inline _LIBCPP_INLINE_VISIBILITY
936basic_string<_CharT, _Traits, allocator<_CharT> >
937bitset<_Size>::to_string(_CharT __zero, _CharT __one) const
938{
939    return to_string<_CharT, _Traits, allocator<_CharT> >(__zero, __one);
940}
941
942template <size_t _Size>
943template <class _CharT>
944inline _LIBCPP_INLINE_VISIBILITY
945basic_string<_CharT, char_traits<_CharT>, allocator<_CharT> >
946bitset<_Size>::to_string(_CharT __zero, _CharT __one) const
947{
948    return to_string<_CharT, char_traits<_CharT>, allocator<_CharT> >(__zero, __one);
949}
950
951template <size_t _Size>
952inline _LIBCPP_INLINE_VISIBILITY
953basic_string<char, char_traits<char>, allocator<char> >
954bitset<_Size>::to_string(char __zero, char __one) const
955{
956    return to_string<char, char_traits<char>, allocator<char> >(__zero, __one);
957}
958
959template <size_t _Size>
960inline _LIBCPP_INLINE_VISIBILITY
961size_t
962bitset<_Size>::count() const _NOEXCEPT
963{
964    return static_cast<size_t>(_VSTD::count(base::__make_iter(0), base::__make_iter(_Size), true));
965}
966
967template <size_t _Size>
968inline _LIBCPP_INLINE_VISIBILITY
969bool
970bitset<_Size>::operator==(const bitset& __rhs) const _NOEXCEPT
971{
972    return _VSTD::equal(base::__make_iter(0), base::__make_iter(_Size), __rhs.__make_iter(0));
973}
974
975template <size_t _Size>
976inline _LIBCPP_INLINE_VISIBILITY
977bool
978bitset<_Size>::operator!=(const bitset& __rhs) const _NOEXCEPT
979{
980    return !(*this == __rhs);
981}
982
983template <size_t _Size>
984bool
985bitset<_Size>::test(size_t __pos) const
986{
987    if (__pos >= _Size)
988#ifndef _LIBCPP_NO_EXCEPTIONS
989        throw out_of_range("bitset test argument out of range");
990#else
991        assert(!"bitset test argument out of range");
992#endif
993    return (*this)[__pos];
994}
995
996template <size_t _Size>
997inline _LIBCPP_INLINE_VISIBILITY
998bool
999bitset<_Size>::all() const _NOEXCEPT
1000{
1001    return base::all();
1002}
1003
1004template <size_t _Size>
1005inline _LIBCPP_INLINE_VISIBILITY
1006bool
1007bitset<_Size>::any() const _NOEXCEPT
1008{
1009    return base::any();
1010}
1011
1012template <size_t _Size>
1013inline _LIBCPP_INLINE_VISIBILITY
1014bitset<_Size>
1015bitset<_Size>::operator<<(size_t __pos) const _NOEXCEPT
1016{
1017    bitset __r = *this;
1018    __r <<= __pos;
1019    return __r;
1020}
1021
1022template <size_t _Size>
1023inline _LIBCPP_INLINE_VISIBILITY
1024bitset<_Size>
1025bitset<_Size>::operator>>(size_t __pos) const _NOEXCEPT
1026{
1027    bitset __r = *this;
1028    __r >>= __pos;
1029    return __r;
1030}
1031
1032template <size_t _Size>
1033inline _LIBCPP_INLINE_VISIBILITY
1034bitset<_Size>
1035operator&(const bitset<_Size>& __x, const bitset<_Size>& __y) _NOEXCEPT
1036{
1037    bitset<_Size> __r = __x;
1038    __r &= __y;
1039    return __r;
1040}
1041
1042template <size_t _Size>
1043inline _LIBCPP_INLINE_VISIBILITY
1044bitset<_Size>
1045operator|(const bitset<_Size>& __x, const bitset<_Size>& __y) _NOEXCEPT
1046{
1047    bitset<_Size> __r = __x;
1048    __r |= __y;
1049    return __r;
1050}
1051
1052template <size_t _Size>
1053inline _LIBCPP_INLINE_VISIBILITY
1054bitset<_Size>
1055operator^(const bitset<_Size>& __x, const bitset<_Size>& __y) _NOEXCEPT
1056{
1057    bitset<_Size> __r = __x;
1058    __r ^= __y;
1059    return __r;
1060}
1061
1062template <size_t _Size>
1063struct _LIBCPP_TYPE_VIS_ONLY hash<bitset<_Size> >
1064    : public unary_function<bitset<_Size>, size_t>
1065{
1066    _LIBCPP_INLINE_VISIBILITY
1067    size_t operator()(const bitset<_Size>& __bs) const _NOEXCEPT
1068        {return __bs.__hash_code();}
1069};
1070
1071template <class _CharT, class _Traits, size_t _Size>
1072basic_istream<_CharT, _Traits>&
1073operator>>(basic_istream<_CharT, _Traits>& __is, bitset<_Size>& __x);
1074
1075template <class _CharT, class _Traits, size_t _Size>
1076basic_ostream<_CharT, _Traits>&
1077operator<<(basic_ostream<_CharT, _Traits>& __os, const bitset<_Size>& __x);
1078
1079_LIBCPP_END_NAMESPACE_STD
1080
1081#endif  // _LIBCPP_BITSET
1082