bitset ()

All bits set to zero. bitset (unsigned long __val)

Initial bits bitwise-copied from a single word (others set to zero). template<class CharT, class Traits, class Alloc> bitset (const basic_string< CharT, Traits, Alloc > &s, size_t position=0)

Use a subset of a string. template<class CharT, class Traits, class Alloc> bitset (const basic_string< CharT, Traits, Alloc > &s, size_t position, size_t n)

Use a subset of a string. bitset< Nb > & set ()

Sets every bit to true. bitset< Nb > & set (size_t position, bool __val=true)

Sets a given bit to a particular value. bitset< Nb > & reset ()

Sets every bit to false. bitset< Nb > & reset (size_t position)

Sets a given bit to false. bitset< Nb > & flip ()

Toggles every bit to its opposite value. bitset< Nb > & flip (size_t position)

Toggles a given bit to its opposite value. bitset< Nb > operator~ () const

See the no-argument flip(). unsigned long to_ulong () const

Retuns a numerical interpretation of the bitset. template<class CharT, class Traits, class Alloc> basic_string< CharT, Traits, Alloc > to_string () const

Retuns a character interpretation of the bitset. template<class CharT, class Traits, class Alloc> void M_copy_from_string (const basic_string< CharT, Traits, Alloc > &s, size_t, size_t)

template<class CharT, class Traits, class Alloc> void M_copy_to_string (basic_string< CharT, Traits, Alloc > &) const

size_t count () const

Returns the number of bits which are set. size_t size () const

Returns the total number of bits. bool test (size_t position) const

Tests the value of a bit. bool any () const

Tests whether any of the bits are on. bool none () const

Tests whether any of the bits are on. size_t Find_first () const

Finds the index of the first 'on' bit. size_t Find_next (size_t __prev) const

Finds the index of the next 'on' bit after prev.

bitset< Nb > & operator &= (const bitset< Nb > &__rhs)

Operations on bitsets. bitset< Nb > & operator|= (const bitset< Nb > &__rhs)

Operations on bitsets. bitset< Nb > & operator^= (const bitset< Nb > &__rhs)

Operations on bitsets.

bitset< Nb > & operator<<= (size_t position)

Operations on bitsets. bitset< Nb > & operator>>= (size_t position)

Operations on bitsets.

bitset< Nb > & Unchecked_set (size_t position)

bitset< Nb > & Unchecked_set (size_t position, int __val)

bitset< Nb > & Unchecked_reset (size_t position)

bitset< Nb > & Unchecked_flip (size_t position)

bool Unchecked_test (size_t position) const

reference operator[] (size_t position)

Array-indexing support. bool operator[] (size_t position) const

Array-indexing support.

bool operator== (const bitset< Nb > &__rhs) const

These comparisons for equality/inequality are, well, bitwise. bool operator!= (const bitset< Nb > &__rhs) const

These comparisons for equality/inequality are, well, bitwise.

bitset< Nb > operator<< (size_t position) const

Self-explanatory. bitset< Nb > operator>> (size_t position) const

Self-explanatory.

typedef Base_bitset< GLIBCXXBITSETWORDS(N)> Base

typedef unsigned long WordT

void M_do_sanitize ()

WordT & M_getword (size_t position)

WordT M_getword (size_t position) const

WordT & M_hiword ()

WordT M_hiword () const

void M_do_and (const Base_bitset< Nw > &x)

void M_do_or (const Base_bitset< Nw > &x)

void M_do_xor (const Base_bitset< Nw > &x)

void M_do_flip ()

void M_do_set ()

void M_do_reset ()

bool M_is_equal (const Base_bitset< Nw > &x) const

bool M_is_any () const

size_t M_do_count () const

static size_t S_whichword (size_t position)

static size_t S_whichbyte (size_t position)

static size_t S_whichbit (size_t position)

static WordT S_maskbit (size_t position)

WordT M_w [Nw]

0 is the least significant word.

class reference

class reference

The bitset class represents a fixed-size sequence of bits.

(Note that bitset does not meet the formal requirements of a container. Mainly, it lacks iterators.)

The template argument, Nb, may be any non-negative number, specifying the number of bits (e.g., '0', '12', '1024*1024').

In the general unoptimized case, storage is allocated in word-sized blocks. Let B be the number of bits in a word, then (Nb+(B-1))/B words will be used for storage. B - NbB bits are unused. (They are the high-order bits in the highest word.) It is a class invariant that those unused bits are always zero.

If you think of bitset as 'a simple array of bits,' be aware that your mental picture is reversed: a bitset behaves the same way as bits in integers do, with the bit at index 0 in the 'least significant / right-hand' position, and the bit at index Nb-1 in the 'most significant / left-hand' position. Thus, unlike other containers, a bitset's index 'counts from right to left,' to put it very loosely.

This behavior is preserved when translating to and from strings. For example, the first line of the following program probably prints 'b('a') is 0001100001' on a modern ASCII system.

     #include <bitset>
     #include <iostream>
     #include <sstream>

using namespace std;

int main() { long a = 'a'; bitset<10> b(a);

cout << 'b('a') is ' << b << endl;

ostringstream s; s << b; string str = s.str(); cout << 'index 3 in the string is ' << str[3] << ' butn' << 'index 3 in the bitset is ' << b[3] << endl; }

Also see http://gcc.gnu.org/onlinedocs/libstdc++/ext/sgiexts.html#ch23 for a description of extensions.

Definition at line 603 of file bitset.

All bits set to zero.

Reimplemented in __gnu_debug_def::bitset< Nb >.

Definition at line 691 of file bitset.

Initial bits bitwise-copied from a single word (others set to zero).

Reimplemented in __gnu_debug_def::bitset< Nb >.

Definition at line 694 of file bitset.

Use a subset of a string.

Parameters: s A string of '0' and '1' characters.

position Index of the first character in s to use; defaults to zero.

Exceptions: std::out_of_range If pos is bigger the size of s.

std::invalid_argument If a character appears in the string which is neither '0' nor '1'.

Definition at line 707 of file bitset.

References std::__throw_out_of_range(), and std::basic_string< CharT, Traits, Alloc >::size().

Use a subset of a string.

Parameters: s A string of '0' and '1' characters.

position Index of the first character in s to use.

n The number of characters to copy.

Exceptions: std::out_of_range If pos is bigger the size of s.

std::invalid_argument If a character appears in the string which is neither '0' nor '1'.

Definition at line 727 of file bitset.

References std::__throw_out_of_range(), and std::basic_string< CharT, Traits, Alloc >::size().

Tests whether any of the bits are on.

Returns: True if at least one bit is set.

Definition at line 1028 of file bitset.

Returns the number of bits which are set.

Definition at line 992 of file bitset.

Toggles a given bit to its opposite value.

Parameters: position The index of the bit.

Exceptions: std::out_of_range If pos is bigger the size of the set.

Reimplemented in __gnu_debug_def::bitset< Nb >.

Definition at line 913 of file bitset.

References std::__throw_out_of_range().

Toggles every bit to its opposite value.

Reimplemented in __gnu_debug_def::bitset< Nb >.

Definition at line 900 of file bitset.

Tests whether any of the bits are on.

Returns: True if none of the bits are set.

Definition at line 1035 of file bitset.

Operations on bitsets.

Parameters: rhs A same-sized bitset.

These should be self-explanatory.

Definition at line 745 of file bitset.

These comparisons for equality/inequality are, well, bitwise.

Definition at line 1005 of file bitset.

Self-explanatory.

Reimplemented in __gnu_debug_def::bitset< Nb >.

Definition at line 1040 of file bitset.

Operations on bitsets.

Parameters: position The number of places to shift.

These should be self-explanatory.

Reimplemented in __gnu_debug_def::bitset< Nb >.

Definition at line 774 of file bitset.

These comparisons for equality/inequality are, well, bitwise.

Definition at line 1001 of file bitset.

Self-explanatory.

Reimplemented in __gnu_debug_def::bitset< Nb >.

Definition at line 1044 of file bitset.

Operations on bitsets.

Parameters: position The number of places to shift.

These should be self-explanatory.

Reimplemented in __gnu_debug_def::bitset< Nb >.

Definition at line 787 of file bitset.

Array-indexing support.

Parameters: position Index into the bitset.

Returns: A bool for a 'const bitset'. For non-const bitsets, an instance of the reference proxy class.

Note: These operators do no range checking and throw no exceptions, as required by DR 11 to the standard.

Reimplemented in __gnu_debug_def::bitset< Nb >.

Definition at line 945 of file bitset.

Array-indexing support.

Parameters: position Index into the bitset.

Returns: A bool for a 'const bitset'. For non-const bitsets, an instance of the reference proxy class.

Note: These operators do no range checking and throw no exceptions, as required by DR 11 to the standard.

Reimplemented in __gnu_debug_def::bitset< Nb >.

Definition at line 942 of file bitset.

References std::bitset< Nb >::reference.

Operations on bitsets.

Parameters: rhs A same-sized bitset.

These should be self-explanatory.

Definition at line 759 of file bitset.

Operations on bitsets.

Parameters: rhs A same-sized bitset.

These should be self-explanatory.

Definition at line 752 of file bitset.

See the no-argument flip().

Reimplemented in __gnu_debug_def::bitset< Nb >.

Definition at line 922 of file bitset.

Sets a given bit to false.

Parameters: position The index of the bit.

Exceptions: std::out_of_range If pos is bigger the size of the set.

Same as writing set(pos,false).

Reimplemented in __gnu_debug_def::bitset< Nb >.

Definition at line 889 of file bitset.

References std::__throw_out_of_range().

Sets every bit to false.

Reimplemented in __gnu_debug_def::bitset< Nb >.

Definition at line 875 of file bitset.

Referenced by std::bitset< Nb >::M_copy_from_string().

Sets a given bit to a particular value.

Parameters: position The index of the bit.

val Either true or false, defaults to true.

Exceptions: std::out_of_range If pos is bigger the size of the set.

Reimplemented in __gnu_debug_def::bitset< Nb >.

Definition at line 864 of file bitset.

References std::__throw_out_of_range(), and __gnu_cxx::__val.

Sets every bit to true.

Reimplemented in __gnu_debug_def::bitset< Nb >.

Definition at line 850 of file bitset.

Referenced by std::bitset< Nb >::M_copy_from_string().

Returns the total number of bits.

Definition at line 996 of file bitset.

Tests the value of a bit.

Parameters: position The index of a bit.

Returns: The value at pos.

Exceptions: std::out_of_range If pos is bigger the size of the set.

Definition at line 1016 of file bitset.

References std::__throw_out_of_range().

Retuns a character interpretation of the bitset.

Returns: The string equivalent of the bits.

Note the ordering of the bits: decreasing character positions correspond to increasing bit positions (see the main class notes for an example).

Also note that you must specify the string's template parameters explicitly. Given a bitset bs and a string :

     s = bs.to_string<char,char_traits<char>,allocator<char> >();

Reimplemented in __gnu_debug_def::bitset< Nb >.

Definition at line 973 of file bitset.

Retuns a numerical interpretation of the bitset.

Returns: The integral equivalent of the bits.

Exceptions: std::overflow_error If there are too many bits to be represented in an unsigned long.

Definition at line 955 of file bitset.

0 is the least significant word.

Definition at line 82 of file bitset.