reactos/include/c++/stlport/stl/_bitset.h

   1 /*
   2  * Copyright (c) 1998
   3  * Silicon Graphics Computer Systems, Inc.
   4  *
   5  * Copyright (c) 1999
   6  * Boris Fomitchev
   7  *
   8  * This material is provided "as is", with absolutely no warranty expressed
   9  * or implied. Any use is at your own risk.
  10  *
  11  * Permission to use or copy this software for any purpose is hereby granted
  12  * without fee, provided the above notices are retained on all copies.
  13  * Permission to modify the code and to distribute modified code is granted,
  14  * provided the above notices are retained, and a notice that the code was
  15  * modified is included with the above copyright notice.
  16  *
  17  */
  18
  19 #ifndef _STLP_BITSET_H
  20 #define _STLP_BITSET_H
  21
  22 // A bitset of size N has N % (sizeof(unsigned long) * CHAR_BIT) unused
  23 // bits.  (They are the high- order bits in the highest word.)  It is
  24 // a class invariant of class bitset<> that those unused bits are
  25 // always zero.
  26
  27 // Most of the actual code isn't contained in bitset<> itself, but in the
  28 // base class _Base_bitset.  The base class works with whole words, not with
  29 // individual bits.  This allows us to specialize _Base_bitset for the
  30 // important special case where the bitset is only a single word.
  31
  32 // The C++ standard does not define the precise semantics of operator[].
  33 // In this implementation the const version of operator[] is equivalent
  34 // to test(), except that it does no range checking.  The non-const version
  35 // returns a reference to a bit, again without doing any range checking.
  36
  37
  38 #ifndef _STLP_INTERNAL_ALGOBASE_H
  39 #  include <stl/_algobase.h>
  40 #endif
  41
  42 #ifndef _STLP_INTERNAL_ALLOC_H
  43 #  include <stl/_alloc.h>
  44 #endif
  45
  46 #ifndef _STLP_INTERNAL_ITERATOR_H
  47 #  include <stl/_iterator.h>
  48 #endif
  49
  50 #ifndef _STLP_INTERNAL_UNINITIALIZED_H
  51 #  include <stl/_uninitialized.h>
  52 #endif
  53
  54 #ifndef _STLP_RANGE_ERRORS_H
  55 #  include <stl/_range_errors.h>
  56 #endif
  57
  58 #ifndef _STLP_INTERNAL_STRING_H
  59 #  include <stl/_string.h>
  60 #endif
  61
  62 #define __BITS_PER_WORD (CHAR_BIT*sizeof(unsigned long))
  63 #define __BITSET_WORDS(__n) ((__n + __BITS_PER_WORD - 1)/__BITS_PER_WORD)
  64
  65 _STLP_BEGIN_NAMESPACE
  66
  67 _STLP_MOVE_TO_PRIV_NAMESPACE
  68
  69 // structure to aid in counting bits
  70 class _STLP_CLASS_DECLSPEC _Bs_G
  71 {
  72   public:
  73     //returns the number of bit set within the buffer between __beg and __end.
  74     static size_t _S_count(const unsigned char *__beg, const unsigned char *__end)
  75 #if defined (_STLP_USE_NO_IOSTREAMS)
  76     {
  77       size_t __result = 0;
  78       for (; __beg != __end; ++__beg) {
  79         for (size_t i = 0; i < (sizeof(unsigned char) * 8); ++i) {
  80           if ((*__beg & (1 << i)) != 0) { ++__result; }
  81         }
  82       }
  83       return __result;
  84     }
  85 #else
  86       ;
  87 #endif
  88     // Mapping from 8 bit unsigned integers to the index of the first one bit set:
  89     static unsigned char _S_first_one(unsigned char __x)
  90 #if defined (_STLP_USE_NO_IOSTREAMS)
  91     {
  92       for (unsigned char i = 0; i < (sizeof(unsigned char) * 8); ++i) {
  93         if ((__x & (1 << i)) != 0) { return i; }
  94       }
  95       return 0;
  96     }
  97 #else
  98       ;
  99 #endif
 100 };
 101
 102 //
 103 // Base class: general case.
 104 //
 105
 106 template<size_t _Nw>
 107 struct _Base_bitset {
 108   typedef unsigned long _WordT;
 109
 110   _WordT _M_w[_Nw];                // 0 is the least significant word.
 111
 112   _Base_bitset() { _M_do_reset(); }
 113
 114   _Base_bitset(unsigned long __val) {
 115     _M_do_reset();
 116     _M_w[0] = __val;
 117   }
 118
 119   static size_t _STLP_CALL _S_whichword( size_t __pos ) {
 120     return __pos / __BITS_PER_WORD;
 121   }
 122   static size_t _STLP_CALL _S_whichbyte( size_t __pos ) {
 123     return (__pos % __BITS_PER_WORD) / CHAR_BIT;
 124   }
 125   static size_t _STLP_CALL _S_whichbit( size_t __pos ) {
 126     return __pos % __BITS_PER_WORD;
 127   }
 128   static _WordT _STLP_CALL _S_maskbit( size_t __pos ) {
 129     return __STATIC_CAST(_WordT,1) << _S_whichbit(__pos);
 130   }
 131
 132   _WordT& _M_getword(size_t __pos)       { return _M_w[_S_whichword(__pos)]; }
 133   _WordT  _M_getword(size_t __pos) const { return _M_w[_S_whichword(__pos)]; }
 134
 135   _WordT& _M_hiword()       { return _M_w[_Nw - 1]; }
 136   _WordT  _M_hiword() const { return _M_w[_Nw - 1]; }
 137
 138   void _M_do_and(const _Base_bitset<_Nw>& __x) {
 139     for ( size_t __i = 0; __i < _Nw; __i++ ) {
 140       _M_w[__i] &= __x._M_w[__i];
 141     }
 142   }
 143
 144   void _M_do_or(const _Base_bitset<_Nw>& __x) {
 145     for ( size_t __i = 0; __i < _Nw; __i++ ) {
 146       _M_w[__i] |= __x._M_w[__i];
 147     }
 148   }
 149
 150   void _M_do_xor(const _Base_bitset<_Nw>& __x) {
 151     for ( size_t __i = 0; __i < _Nw; __i++ ) {
 152       _M_w[__i] ^= __x._M_w[__i];
 153     }
 154   }
 155
 156   void _M_do_left_shift(size_t __shift);
 157
 158   void _M_do_right_shift(size_t __shift);
 159
 160   void _M_do_flip() {
 161     for ( size_t __i = 0; __i < _Nw; __i++ ) {
 162       _M_w[__i] = ~_M_w[__i];
 163     }
 164   }
 165
 166   void _M_do_set() {
 167     for ( size_t __i = 0; __i < _Nw; __i++ ) {
 168       _M_w[__i] = ~__STATIC_CAST(_WordT,0);
 169     }
 170   }
 171
 172   void _M_do_reset() { memset(_M_w, 0, _Nw * sizeof(_WordT)); }
 173
 174   bool _M_is_equal(const _Base_bitset<_Nw>& __x) const {
 175     for (size_t __i = 0; __i < _Nw; ++__i) {
 176       if (_M_w[__i] != __x._M_w[__i])
 177         return false;
 178     }
 179     return true;
 180   }
 181
 182   bool _M_is_any() const {
 183     for ( size_t __i = 0; __i < _Nw ; __i++ ) {
 184       if ( _M_w[__i] != __STATIC_CAST(_WordT,0) )
 185         return true;
 186     }
 187     return false;
 188   }
 189
 190   size_t _M_do_count() const {
 191     const unsigned char* __byte_ptr = (const unsigned char*)_M_w;
 192     const unsigned char* __end_ptr = (const unsigned char*)(_M_w+_Nw);
 193
 194     return _Bs_G::_S_count(__byte_ptr, __end_ptr);
 195   }
 196
 197   unsigned long _M_do_to_ulong() const;
 198
 199   // find first "on" bit
 200   size_t _M_do_find_first(size_t __not_found) const;
 201
 202   // find the next "on" bit that follows "prev"
 203   size_t _M_do_find_next(size_t __prev, size_t __not_found) const;
 204 };
 205
 206 //
 207 // Base class: specialization for a single word.
 208 //
 209 _STLP_TEMPLATE_NULL
 210 struct _Base_bitset<1UL> {
 211   typedef unsigned long _WordT;
 212   typedef _Base_bitset<1UL> _Self;
 213
 214   _WordT _M_w;
 215
 216   _Base_bitset( void ) : _M_w(0) {}
 217   _Base_bitset(unsigned long __val) : _M_w(__val) {}
 218
 219   static size_t _STLP_CALL _S_whichword( size_t __pos ) {
 220     return __pos / __BITS_PER_WORD ;
 221   }
 222   static size_t _STLP_CALL _S_whichbyte( size_t __pos ) {
 223     return (__pos % __BITS_PER_WORD) / CHAR_BIT;
 224   }
 225   static size_t _STLP_CALL _S_whichbit( size_t __pos ) {
 226     return __pos % __BITS_PER_WORD;
 227   }
 228   static _WordT _STLP_CALL _S_maskbit( size_t __pos ) {
 229     return (__STATIC_CAST(_WordT,1)) << _S_whichbit(__pos);
 230   }
 231
 232   _WordT& _M_getword(size_t)       { return _M_w; }
 233   _WordT  _M_getword(size_t) const { return _M_w; }
 234
 235   _WordT& _M_hiword()       { return _M_w; }
 236   _WordT  _M_hiword() const { return _M_w; }
 237
 238   void _M_do_and(const _Self& __x) { _M_w &= __x._M_w; }
 239   void _M_do_or(const _Self& __x)  { _M_w |= __x._M_w; }
 240   void _M_do_xor(const _Self& __x) { _M_w ^= __x._M_w; }
 241   void _M_do_left_shift(size_t __shift)     { _M_w <<= __shift; }
 242   void _M_do_right_shift(size_t __shift)    { _M_w >>= __shift; }
 243   void _M_do_flip()                       { _M_w = ~_M_w; }
 244   void _M_do_set()                        { _M_w = ~__STATIC_CAST(_WordT,0); }
 245   void _M_do_reset()                      { _M_w = 0; }
 246
 247   bool _M_is_equal(const _Self& __x) const {
 248     return _M_w == __x._M_w;
 249   }
 250   bool _M_is_any() const {
 251     return _M_w != 0;
 252   }
 253
 254   size_t _M_do_count() const {
 255     const unsigned char* __byte_ptr = (const unsigned char*)&_M_w;
 256     const unsigned char* __end_ptr = ((const unsigned char*)&_M_w)+sizeof(_M_w);
 257     return _Bs_G::_S_count(__byte_ptr, __end_ptr);
 258   }
 259
 260   unsigned long _M_do_to_ulong() const { return _M_w; }
 261
 262   inline size_t _M_do_find_first(size_t __not_found) const;
 263
 264   // find the next "on" bit that follows "prev"
 265   inline size_t _M_do_find_next(size_t __prev, size_t __not_found) const;
 266 };
 267
 268
 269 // ------------------------------------------------------------
 270 //
 271 // Definitions of should-be-non-inline functions from the single-word version of
 272 //  _Base_bitset.
 273 //
 274 inline size_t
 275 _Base_bitset<1UL>::_M_do_find_first(size_t __not_found) const {
 276   //  typedef unsigned long _WordT;
 277   _WordT __thisword = _M_w;
 278
 279   if ( __thisword != __STATIC_CAST(_WordT,0) ) {
 280     // find byte within word
 281     for ( size_t __j = 0; __j < sizeof(_WordT); __j++ ) {
 282       unsigned char __this_byte
 283         = __STATIC_CAST(unsigned char,(__thisword & (~(unsigned char)0)));
 284       if ( __this_byte )
 285         return __j*CHAR_BIT + _Bs_G::_S_first_one(__this_byte);
 286
 287       __thisword >>= CHAR_BIT;
 288     }
 289   }
 290   // not found, so return a value that indicates failure.
 291   return __not_found;
 292 }
 293
 294 inline size_t
 295 _Base_bitset<1UL>::_M_do_find_next(size_t __prev,
 296                                    size_t __not_found ) const {
 297   // make bound inclusive
 298   ++__prev;
 299
 300   // check out of bounds
 301   if ( __prev >= __BITS_PER_WORD )
 302     return __not_found;
 303
 304     // search first (and only) word
 305   _WordT __thisword = _M_w;
 306
 307   // mask off bits below bound
 308   __thisword &= (~__STATIC_CAST(_WordT,0)) << _S_whichbit(__prev);
 309
 310   if ( __thisword != __STATIC_CAST(_WordT,0) ) {
 311     // find byte within word
 312     // get first byte into place
 313     __thisword >>= _S_whichbyte(__prev) * CHAR_BIT;
 314     for ( size_t __j = _S_whichbyte(__prev); __j < sizeof(_WordT); __j++ ) {
 315       unsigned char __this_byte
 316         = __STATIC_CAST(unsigned char,(__thisword & (~(unsigned char)0)));
 317       if ( __this_byte )
 318         return __j*CHAR_BIT + _Bs_G::_S_first_one(__this_byte);
 319
 320       __thisword >>= CHAR_BIT;
 321     }
 322   }
 323
 324   // not found, so return a value that indicates failure.
 325   return __not_found;
 326 } // end _M_do_find_next
 327
 328
 329 // ------------------------------------------------------------
 330 // Helper class to zero out the unused high-order bits in the highest word.
 331
 332 template <size_t _Extrabits> struct _Sanitize {
 333   static void _STLP_CALL _M_do_sanitize(unsigned long& __val)
 334   { __val &= ~((~__STATIC_CAST(unsigned long,0)) << _Extrabits); }
 335 };
 336
 337 _STLP_TEMPLATE_NULL struct _Sanitize<0UL> {
 338   static void _STLP_CALL _M_do_sanitize(unsigned long) {}
 339 };
 340
 341 _STLP_MOVE_TO_STD_NAMESPACE
 342
 343 // ------------------------------------------------------------
 344 // Class bitset.
 345 //   _Nb may be any nonzero number of type size_t.
 346 template<size_t _Nb>
 347 class bitset : public _STLP_PRIV _Base_bitset<__BITSET_WORDS(_Nb) > {
 348 public:
 349   enum { _Words = __BITSET_WORDS(_Nb) } ;
 350
 351 private:
 352   typedef _STLP_PRIV _Base_bitset< _Words > _Base;
 353
 354   void _M_do_sanitize() {
 355     _STLP_PRIV _Sanitize<_Nb%__BITS_PER_WORD >::_M_do_sanitize(this->_M_hiword());
 356   }
 357 public:
 358   typedef unsigned long _WordT;
 359   struct reference;
 360   friend struct reference;
 361
 362   // bit reference:
 363   struct reference {
 364   typedef _STLP_PRIV _Base_bitset<_Words > _Bitset_base;
 365   typedef bitset<_Nb> _Bitset;
 366     //    friend _Bitset;
 367     _WordT *_M_wp;
 368     size_t _M_bpos;
 369
 370     // should be left undefined
 371     reference() {}
 372
 373     reference( _Bitset& __b, size_t __pos ) {
 374       _M_wp = &__b._M_getword(__pos);
 375       _M_bpos = _Bitset_base::_S_whichbit(__pos);
 376     }
 377
 378   public:
 379     ~reference() {}
 380
 381     // for b[i] = __x;
 382     reference& operator=(bool __x) {
 383       if ( __x )
 384         *_M_wp |= _Bitset_base::_S_maskbit(_M_bpos);
 385       else
 386         *_M_wp &= ~_Bitset_base::_S_maskbit(_M_bpos);
 387
 388       return *this;
 389     }
 390
 391     // for b[i] = b[__j];
 392     reference& operator=(const reference& __j) {
 393       if ( (*(__j._M_wp) & _Bitset_base::_S_maskbit(__j._M_bpos)) )
 394         *_M_wp |= _Bitset_base::_S_maskbit(_M_bpos);
 395       else
 396         *_M_wp &= ~_Bitset_base::_S_maskbit(_M_bpos);
 397
 398       return *this;
 399     }
 400
 401     // flips the bit
 402     bool operator~() const { return (*(_M_wp) & _Bitset_base::_S_maskbit(_M_bpos)) == 0; }
 403
 404     // for __x = b[i];
 405     operator bool() const { return (*(_M_wp) & _Bitset_base::_S_maskbit(_M_bpos)) != 0; }
 406
 407     // for b[i].flip();
 408     reference& flip() {
 409       *_M_wp ^= _Bitset_base::_S_maskbit(_M_bpos);
 410       return *this;
 411     }
 412   };
 413
 414   // 23.3.5.1 constructors:
 415   bitset() {}
 416
 417   bitset(unsigned long __val) : _STLP_PRIV _Base_bitset<_Words>(__val) { _M_do_sanitize(); }
 418
 419 #if defined (_STLP_MEMBER_TEMPLATES)
 420   template<class _CharT, class _Traits, class _Alloc>
 421   explicit bitset(const basic_string<_CharT,_Traits,_Alloc>& __s,
 422                   size_t __pos = 0)
 423     : _STLP_PRIV _Base_bitset<_Words >() {
 424     if (__pos > __s.size())
 425       __stl_throw_out_of_range("bitset");
 426     _M_copy_from_string(__s, __pos,
 427                         basic_string<_CharT, _Traits, _Alloc>::npos);
 428   }
 429   template<class _CharT, class _Traits, class _Alloc>
 430   bitset(const basic_string<_CharT, _Traits, _Alloc>& __s,
 431           size_t __pos,
 432           size_t __n)
 433   : _STLP_PRIV _Base_bitset<_Words >() {
 434     if (__pos > __s.size())
 435       __stl_throw_out_of_range("bitset");
 436     _M_copy_from_string(__s, __pos, __n);
 437   }
 438 #else /* _STLP_MEMBER_TEMPLATES */
 439   explicit bitset(const string& __s,
 440                   size_t __pos = 0,
 441                   size_t __n = (size_t)-1)
 442     : _STLP_PRIV _Base_bitset<_Words >() {
 443     if (__pos > __s.size())
 444       __stl_throw_out_of_range("bitset");
 445     _M_copy_from_string(__s, __pos, __n);
 446   }
 447 #endif /* _STLP_MEMBER_TEMPLATES */
 448
 449   // 23.3.5.2 bitset operations:
 450   bitset<_Nb>& operator&=(const bitset<_Nb>& __rhs) {
 451     this->_M_do_and(__rhs);
 452     return *this;
 453   }
 454
 455   bitset<_Nb>& operator|=(const bitset<_Nb>& __rhs) {
 456     this->_M_do_or(__rhs);
 457     return *this;
 458   }
 459
 460   bitset<_Nb>& operator^=(const bitset<_Nb>& __rhs) {
 461     this->_M_do_xor(__rhs);
 462     return *this;
 463   }
 464
 465   bitset<_Nb>& operator<<=(size_t __pos) {
 466     this->_M_do_left_shift(__pos);
 467     this->_M_do_sanitize();
 468     return *this;
 469   }
 470
 471   bitset<_Nb>& operator>>=(size_t __pos) {
 472     this->_M_do_right_shift(__pos);
 473     this->_M_do_sanitize();
 474     return *this;
 475   }
 476
 477   //
 478   // Extension:
 479   // Versions of single-bit set, reset, flip, test with no range checking.
 480   //
 481
 482   bitset<_Nb>& _Unchecked_set(size_t __pos) {
 483     this->_M_getword(__pos) |= _STLP_PRIV _Base_bitset<_Words > ::_S_maskbit(__pos);
 484     return *this;
 485   }
 486
 487   bitset<_Nb>& _Unchecked_set(size_t __pos, int __val) {
 488     if (__val)
 489       this->_M_getword(__pos) |= this->_S_maskbit(__pos);
 490     else
 491       this->_M_getword(__pos) &= ~ this->_S_maskbit(__pos);
 492
 493     return *this;
 494   }
 495
 496   bitset<_Nb>& _Unchecked_reset(size_t __pos) {
 497     this->_M_getword(__pos) &= ~ this->_S_maskbit(__pos);
 498     return *this;
 499   }
 500
 501   bitset<_Nb>& _Unchecked_flip(size_t __pos) {
 502     this->_M_getword(__pos) ^= this->_S_maskbit(__pos);
 503     return *this;
 504   }
 505
 506   bool _Unchecked_test(size_t __pos) const {
 507     return (this->_M_getword(__pos) & this->_S_maskbit(__pos)) != __STATIC_CAST(_WordT,0);
 508   }
 509
 510   // Set, reset, and flip.
 511
 512   bitset<_Nb>& set() {
 513     this->_M_do_set();
 514     this->_M_do_sanitize();
 515     return *this;
 516   }
 517
 518   bitset<_Nb>& set(size_t __pos) {
 519     if (__pos >= _Nb)
 520       __stl_throw_out_of_range("bitset");
 521     return _Unchecked_set(__pos);
 522   }
 523
 524   bitset<_Nb>& set(size_t __pos, int __val) {
 525     if (__pos >= _Nb)
 526       __stl_throw_out_of_range("bitset");
 527     return _Unchecked_set(__pos, __val);
 528   }
 529
 530   bitset<_Nb>& reset() {
 531     this->_M_do_reset();
 532     return *this;
 533   }
 534
 535   bitset<_Nb>& reset(size_t __pos) {
 536     if (__pos >= _Nb)
 537       __stl_throw_out_of_range("bitset");
 538
 539     return _Unchecked_reset(__pos);
 540   }
 541
 542   bitset<_Nb>& flip() {
 543     this->_M_do_flip();
 544     this->_M_do_sanitize();
 545     return *this;
 546   }
 547
 548   bitset<_Nb>& flip(size_t __pos) {
 549     if (__pos >= _Nb)
 550       __stl_throw_out_of_range("bitset");
 551
 552     return _Unchecked_flip(__pos);
 553   }
 554
 555   bitset<_Nb> operator~() const {
 556     return bitset<_Nb>(*this).flip();
 557   }
 558
 559   // element access:
 560   //for b[i];
 561   reference operator[](size_t __pos) { return reference(*this,__pos); }
 562   bool operator[](size_t __pos) const { return _Unchecked_test(__pos); }
 563
 564   unsigned long to_ulong() const { return this->_M_do_to_ulong(); }
 565
 566 #if defined (_STLP_MEMBER_TEMPLATES) && !defined (_STLP_NO_EXPLICIT_FUNCTION_TMPL_ARGS)
 567   template <class _CharT, class _Traits, class _Alloc>
 568   basic_string<_CharT, _Traits, _Alloc> to_string() const {
 569     basic_string<_CharT, _Traits, _Alloc> __result;
 570     _M_copy_to_string(__result);
 571     return __result;
 572   }
 573 #else
 574   string to_string() const {
 575     string __result;
 576     _M_copy_to_string(__result);
 577     return __result;
 578   }
 579 #endif /* _STLP_EXPLICIT_FUNCTION_TMPL_ARGS */
 580
 581   size_t count() const { return this->_M_do_count(); }
 582
 583   size_t size() const { return _Nb; }
 584
 585   bool operator==(const bitset<_Nb>& __rhs) const {
 586     return this->_M_is_equal(__rhs);
 587   }
 588   bool operator!=(const bitset<_Nb>& __rhs) const {
 589     return !this->_M_is_equal(__rhs);
 590   }
 591
 592   bool test(size_t __pos) const {
 593     if (__pos >= _Nb)
 594       __stl_throw_out_of_range("bitset");
 595
 596     return _Unchecked_test(__pos);
 597   }
 598
 599   bool any() const { return this->_M_is_any(); }
 600   bool none() const { return !this->_M_is_any(); }
 601
 602   bitset<_Nb> operator<<(size_t __pos) const {
 603     bitset<_Nb> __result(*this);
 604     __result <<= __pos ;  return __result;
 605   }
 606   bitset<_Nb> operator>>(size_t __pos) const {
 607     bitset<_Nb> __result(*this);
 608     __result >>= __pos ;  return __result;
 609   }
 610
 611 #if !defined (_STLP_NO_EXTENSIONS)
 612   //
 613   // EXTENSIONS: bit-find operations.  These operations are
 614   // experimental, and are subject to change or removal in future
 615   // versions.
 616   //
 617
 618   // find the index of the first "on" bit
 619   size_t _Find_first() const
 620     { return this->_M_do_find_first(_Nb); }
 621
 622   // find the index of the next "on" bit after prev
 623   size_t _Find_next( size_t __prev ) const
 624     { return this->_M_do_find_next(__prev, _Nb); }
 625 #endif
 626
 627 //
 628 // Definitions of should-be non-inline member functions.
 629 //
 630 #if defined (_STLP_MEMBER_TEMPLATES)
 631   template<class _CharT, class _Traits, class _Alloc>
 632   void _M_copy_from_string(const basic_string<_CharT,_Traits,_Alloc>& __s,
 633                            size_t __pos, size_t __n) {
 634 #else
 635   void _M_copy_from_string(const string& __s,
 636                            size_t __pos, size_t __n) {
 637     typedef typename string::traits_type _Traits;
 638 #endif
 639     reset();
 640     size_t __tmp = _Nb;
 641     const size_t __Nbits = (min) (__tmp, (min) (__n, __s.size() - __pos));
 642     for ( size_t __i= 0; __i < __Nbits; ++__i) {
 643       typename _Traits::int_type __k = _Traits::to_int_type(__s[__pos + __Nbits - __i - 1]);
 644       // boris : widen() ?
 645       if (__k == '1')
 646         set(__i);
 647       else if (__k != '0')
 648         __stl_throw_invalid_argument("bitset");
 649     }
 650   }
 651
 652 #if defined (_STLP_MEMBER_TEMPLATES)
 653   template <class _CharT, class _Traits, class _Alloc>
 654   void _M_copy_to_string(basic_string<_CharT, _Traits, _Alloc>& __s) const
 655 #else
 656   void _M_copy_to_string(string& __s) const
 657 #endif
 658   {
 659     __s.assign(_Nb, '0');
 660
 661     for (size_t __i = 0; __i < _Nb; ++__i) {
 662       if (_Unchecked_test(__i))
 663         __s[_Nb - 1 - __i] = '1';
 664     }
 665   }
 666
 667 #if !defined (_STLP_MEMBER_TEMPLATES) && !defined (_STLP_NO_WCHAR_T)
 668   void _M_copy_to_string(wstring& __s) const {
 669     __s.assign(_Nb, '0');
 670
 671     for (size_t __i = 0; __i < _Nb; ++__i) {
 672       if (_Unchecked_test(__i))
 673         __s[_Nb - 1 - __i] = '1';
 674     }
 675   }
 676 #endif
 677
 678 #if defined (_STLP_NON_TYPE_TMPL_PARAM_BUG)
 679   bitset<_Nb> operator&(const bitset<_Nb>& __y) const {
 680     bitset<_Nb> __result(*this);
 681     __result &= __y;
 682     return __result;
 683   }
 684   bitset<_Nb> operator|(const bitset<_Nb>& __y) const {
 685     bitset<_Nb> __result(*this);
 686     __result |= __y;
 687     return __result;
 688   }
 689   bitset<_Nb> operator^(const bitset<_Nb>& __y) const {
 690     bitset<_Nb> __result(*this);
 691     __result ^= __y;
 692     return __result;
 693   }
 694 #endif
 695 };
 696
 697 // ------------------------------------------------------------
 698 //
 699 // 23.3.5.3 bitset operations:
 700 //
 701 #if ! defined (_STLP_NON_TYPE_TMPL_PARAM_BUG)
 702 template <size_t _Nb>
 703 inline bitset<_Nb>  _STLP_CALL
 704 operator&(const bitset<_Nb>& __x,
 705           const bitset<_Nb>& __y) {
 706   bitset<_Nb> __result(__x);
 707   __result &= __y;
 708   return __result;
 709 }
 710
 711
 712 template <size_t _Nb>
 713 inline bitset<_Nb>  _STLP_CALL
 714 operator|(const bitset<_Nb>& __x,
 715           const bitset<_Nb>& __y) {
 716   bitset<_Nb> __result(__x);
 717   __result |= __y;
 718   return __result;
 719 }
 720
 721 template <size_t _Nb>
 722 inline bitset<_Nb>  _STLP_CALL
 723 operator^(const bitset<_Nb>& __x,
 724           const bitset<_Nb>& __y) {
 725   bitset<_Nb> __result(__x);
 726   __result ^= __y;
 727   return __result;
 728 }
 729
 730 #if !defined (_STLP_USE_NO_IOSTREAMS)
 731
 732 _STLP_END_NAMESPACE
 733
 734 #  if !(defined (_STLP_MSVC) && (_STLP_MSVC < 1300)) && \
 735       !(defined(__SUNPRO_CC) && (__SUNPRO_CC < 0x500))
 736
 737 #ifndef _STLP_INTERNAL_IOSFWD
 738 #  include <stl/_iosfwd.h>
 739 #endif
 740
 741 _STLP_BEGIN_NAMESPACE
 742
 743 template <class _CharT, class _Traits, size_t _Nb>
 744 basic_istream<_CharT, _Traits>&  _STLP_CALL
 745 operator>>(basic_istream<_CharT, _Traits>& __is, bitset<_Nb>& __x);
 746
 747 template <class _CharT, class _Traits, size_t _Nb>
 748 basic_ostream<_CharT, _Traits>& _STLP_CALL
 749 operator<<(basic_ostream<_CharT, _Traits>& __os, const bitset<_Nb>& __x);
 750
 751 #  else
 752
 753 #ifndef _STLP_STRING_IO_H
 754 #  include <stl/_string_io.h> //includes _istream.h and _ostream.h
 755 #endif
 756
 757 _STLP_BEGIN_NAMESPACE
 758
 759 template <size_t _Nb>
 760 istream&  _STLP_CALL
 761 operator>>(istream& __is, bitset<_Nb>& __x) {
 762   typedef typename string::traits_type _Traits;
 763   string __tmp;
 764   __tmp.reserve(_Nb);
 765
 766   // Skip whitespace
 767   typename istream::sentry __sentry(__is);
 768   if (__sentry) {
 769     streambuf* __buf = __is.rdbuf();
 770     for (size_t __i = 0; __i < _Nb; ++__i) {
 771       static typename _Traits::int_type __eof = _Traits::eof();
 772
 773       typename _Traits::int_type __c1 = __buf->sbumpc();
 774       if (_Traits::eq_int_type(__c1, __eof)) {
 775         __is.setstate(ios_base::eofbit);
 776         break;
 777       }
 778       else {
 779         typename _Traits::char_type __c2 = _Traits::to_char_type(__c1);
 780         char __c  = __is.narrow(__c2, '*');
 781
 782         if (__c == '0' || __c == '1')
 783           __tmp.push_back(__c);
 784         else if (_Traits::eq_int_type(__buf->sputbackc(__c2), __eof)) {
 785           __is.setstate(ios_base::failbit);
 786           break;
 787         }
 788       }
 789     }
 790
 791     if (__tmp.empty())
 792       __is.setstate(ios_base::failbit);
 793     else
 794       __x._M_copy_from_string(__tmp, __STATIC_CAST(size_t,0), _Nb);
 795   }
 796
 797   return __is;
 798 }
 799
 800 template <size_t _Nb>
 801 ostream& _STLP_CALL
 802 operator<<(ostream& __os, const bitset<_Nb>& __x) {
 803   string __tmp;
 804   __x._M_copy_to_string(__tmp);
 805   return __os << __tmp;
 806 }
 807
 808 #    if !defined (_STLP_NO_WCHAR_T)
 809
 810 template <size_t _Nb>
 811 wistream&  _STLP_CALL
 812 operator>>(wistream& __is, bitset<_Nb>& __x) {
 813   typedef typename wstring::traits_type _Traits;
 814   wstring __tmp;
 815   __tmp.reserve(_Nb);
 816
 817   // Skip whitespace
 818   typename wistream::sentry __sentry(__is);
 819   if (__sentry) {
 820     wstreambuf* __buf = __is.rdbuf();
 821     for (size_t __i = 0; __i < _Nb; ++__i) {
 822       static typename _Traits::int_type __eof = _Traits::eof();
 823
 824       typename _Traits::int_type __c1 = __buf->sbumpc();
 825       if (_Traits::eq_int_type(__c1, __eof)) {
 826         __is.setstate(ios_base::eofbit);
 827         break;
 828       }
 829       else {
 830         typename _Traits::char_type __c2 = _Traits::to_char_type(__c1);
 831         char __c  = __is.narrow(__c2, '*');
 832
 833         if (__c == '0' || __c == '1')
 834           __tmp.push_back(__c);
 835         else if (_Traits::eq_int_type(__buf->sputbackc(__c2), __eof)) {
 836           __is.setstate(ios_base::failbit);
 837           break;
 838         }
 839       }
 840     }
 841
 842     if (__tmp.empty())
 843       __is.setstate(ios_base::failbit);
 844     else
 845       __x._M_copy_from_string(__tmp, __STATIC_CAST(size_t,0), _Nb);
 846   }
 847
 848   return __is;
 849 }
 850
 851 template <size_t _Nb>
 852 wostream& _STLP_CALL
 853 operator<<(wostream& __os, const bitset<_Nb>& __x) {
 854   wstring __tmp;
 855   __x._M_copy_to_string(__tmp);
 856   return __os << __tmp;
 857 }
 858
 859 #    endif /* _STLP_NO_WCHAR_T */
 860 #  endif
 861 #endif
 862
 863 #endif /* _STLP_NON_TYPE_TMPL_PARAM_BUG */
 864
 865 #undef  bitset
 866
 867 _STLP_END_NAMESPACE
 868
 869 #undef __BITS_PER_WORD
 870 #undef __BITSET_WORDS
 871
 872 #if !defined (_STLP_LINK_TIME_INSTANTIATION)
 873 #  include <stl/_bitset.c>
 874 #endif
 875
 876 #endif /* _STLP_BITSET_H */
 877
 878 // Local Variables:
 879 // mode:C++
 880 // End: