1 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 #define _STLP_BITSET

    21 

    22 // This implementation of bitset<> has a second template parameter,

    23 // _WordT, which defaults to unsigned long.  *YOU SHOULD NOT USE

    24 // THIS FEATURE*.  It is experimental, and it may be removed in

    25 // future releases.

    26 

    27 // A bitset of size N, using words of type _WordT, will have 

    28 // N % (sizeof(_WordT) * CHAR_BIT) unused bits.  (They are the high-

    29 // order bits in the highest word.)  It is a class invariant

    30 // of class bitset<> that those unused bits are always zero.

    31 

    32 // Most of the actual code isn't contained in bitset<> itself, but in the 

    33 // base class _Base_bitset.  The base class works with whole words, not with

    34 // individual bits.  This allows us to specialize _Base_bitset for the

    35 // important special case where the bitset is only a single word.

    36 

    37 // The C++ standard does not define the precise semantics of operator[].

    38 // In this implementation the const version of operator[] is equivalent

    39 // to test(), except that it does no range checking.  The non-const version

    40 // returns a reference to a bit, again without doing any range checking.

    41 

    42 # ifndef _STLP_OUTERMOST_HEADER_ID

    43 #  define _STLP_OUTERMOST_HEADER_ID 0x2

    44 #  include <stl/_prolog.h>

    45 # endif

    46 

    47 #ifdef _STLP_PRAGMA_ONCE

    48 # pragma once

    49 #endif

    50 

    51 # include <stl/_bitset.h>

    52 

    53 # if (_STLP_OUTERMOST_HEADER_ID == 0x2 )

    54 #  include <stl/_epilog.h>

    55 #  undef _STLP_OUTERMOST_HEADER_ID

    56 # endif

    57 

    58 #endif /* _STLP_BITSET */

    59 

    60 

    61 // Local Variables:

    62 // mode:C++

    63 // End:

    64