sdk/include/c++/stlport/bitset

   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
  20
  21 // This implementation of bitset<> has a second template parameter,
  22 // _WordT, which defaults to unsigned long.  *YOU SHOULD NOT USE
  23 // THIS FEATURE*.  It is experimental, and it may be removed in
  24 // future releases.
  25
  26 // A bitset of size N, using words of type _WordT, will have
  27 // N % (sizeof(_WordT) * CHAR_BIT) unused bits.  (They are the high-
  28 // order bits in the highest word.)  It is a class invariant
  29 // of class bitset<> that those unused bits are always zero.
  30
  31 // Most of the actual code isn't contained in bitset<> itself, but in the
  32 // base class _Base_bitset.  The base class works with whole words, not with
  33 // individual bits.  This allows us to specialize _Base_bitset for the
  34 // important special case where the bitset is only a single word.
  35
  36 // The C++ standard does not define the precise semantics of operator[].
  37 // In this implementation the const version of operator[] is equivalent
  38 // to test(), except that it does no range checking.  The non-const version
  39 // returns a reference to a bit, again without doing any range checking.
  40
  41 #ifndef _STLP_OUTERMOST_HEADER_ID
  42 #  define _STLP_OUTERMOST_HEADER_ID 0x2
  43 #  include <stl/_prolog.h>
  44 #  define _STLP_BITSET
  45 #endif
  46
  47 #if (_STLP_OUTERMOST_HEADER_ID == 0x2)
  48 #  ifndef _STLP_INTERNAL_BITSET
  49 #    include <stl/_bitset.h>
  50 #  endif
  51 #endif
  52
  53 #if (_STLP_OUTERMOST_HEADER_ID != 0x2) || defined (_STLP_IMPORT_VENDOR_STD)
  54 #  if defined (_STLP_HAS_INCLUDE_NEXT)
  55 #    include_next <bitset>
  56 #  else
  57 #    include _STLP_NATIVE_HEADER(bitset)
  58 #  endif
  59 #endif
  60
  61 #if (_STLP_OUTERMOST_HEADER_ID == 0x2 )
  62 #  include <stl/_epilog.h>
  63 #  undef _STLP_OUTERMOST_HEADER_ID
  64 #endif
  65
  66 #endif /* _STLP_BITSET */
  67
  68 // Local Variables:
  69 // mode:C++
  70 // End: