std::bitset< _Nb > Class Template Reference
[Containers]

Inheritance diagram for std::bitset< _Nb >:

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Detailed Description

template<size_t _Nb>
class std::bitset< _Nb >

(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] << " but\n"
              << "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 646 of file bitset.

Public Member Functions

Friends

Classes


Constructor & Destructor Documentation

template<size_t _Nb>
std::bitset< _Nb >::bitset (  )  [inline]

All bits set to zero.

Reimplemented in std::__debug::bitset< _Nb >.

Definition at line 736 of file bitset.

template<size_t _Nb>
std::bitset< _Nb >::bitset ( unsigned long  __val  )  [inline]

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

Reimplemented in std::__debug::bitset< _Nb >.

Definition at line 740 of file bitset.

template<size_t _Nb>
template<class _CharT, class _Traits, class _Alloc>
std::bitset< _Nb >::bitset ( const std::basic_string< _CharT, _Traits, _Alloc > &  __s,
size_t  __position = 0 
) [inline, explicit]

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 755 of file bitset.

References __N, std::bitset< _Nb >::_M_copy_from_string(), and std::basic_string< _CharT, _Traits, _Alloc >::size().

template<size_t _Nb>
template<class _CharT, class _Traits, class _Alloc>
std::bitset< _Nb >::bitset ( const std::basic_string< _CharT, _Traits, _Alloc > &  __s,
size_t  __position,
size_t  __n 
) [inline]

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 776 of file bitset.

References __N, std::bitset< _Nb >::_M_copy_from_string(), and std::basic_string< _CharT, _Traits, _Alloc >::size().


Member Function Documentation

template<size_t _Nb>
bool std::bitset< _Nb >::any (  )  const [inline]

Tests whether any of the bits are on.

Returns:
True if at least one bit is set.

Definition at line 1100 of file bitset.

References std::_Base_bitset< _Nw >::_M_is_any().

template<size_t _Nb>
size_t std::bitset< _Nb >::count (  )  const [inline]

Returns the number of bits which are set.

Definition at line 1062 of file bitset.

References std::_Base_bitset< _Nw >::_M_do_count().

template<size_t _Nb>
bitset<_Nb>& std::bitset< _Nb >::flip ( size_t  __position  )  [inline]

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 std::__debug::bitset< _Nb >.

Definition at line 961 of file bitset.

References __N, and std::bitset< _Nb >::_Unchecked_flip().

template<size_t _Nb>
bitset<_Nb>& std::bitset< _Nb >::flip (  )  [inline]

Toggles every bit to its opposite value.

Reimplemented in std::__debug::bitset< _Nb >.

Definition at line 948 of file bitset.

References std::_Base_bitset< _Nw >::_M_do_flip().

Referenced by std::__debug::bitset< _Nb >::flip().

template<size_t _Nb>
bool std::bitset< _Nb >::none (  )  const [inline]

Tests whether any of the bits are on.

Returns:
True if none of the bits are set.

Definition at line 1108 of file bitset.

References std::_Base_bitset< _Nw >::_M_is_any().

template<size_t _Nb>
bitset<_Nb>& std::bitset< _Nb >::operator &= ( const bitset< _Nb > &  __rhs  )  [inline]

Operations on bitsets.

Parameters:
rhs A same-sized bitset.
These should be self-explanatory.

Definition at line 795 of file bitset.

References std::_Base_bitset< _Nw >::_M_do_and().

template<size_t _Nb>
bitset<_Nb> std::bitset< _Nb >::operator<< ( size_t  __position  )  const [inline]

Self-explanatory.

Reimplemented in std::__debug::bitset< _Nb >.

Definition at line 1114 of file bitset.

template<size_t _Nb>
bitset<_Nb>& std::bitset< _Nb >::operator<<= ( size_t  __position  )  [inline]

Operations on bitsets.

Parameters:
position The number of places to shift.
These should be self-explanatory.

Reimplemented in std::__debug::bitset< _Nb >.

Definition at line 824 of file bitset.

References std::_Base_bitset< _Nw >::_M_do_left_shift(), and std::_Base_bitset< _Nw >::_M_do_reset().

template<size_t _Nb>
bool std::bitset< _Nb >::operator== ( const bitset< _Nb > &  __rhs  )  const [inline]

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

Definition at line 1073 of file bitset.

References std::_Base_bitset< _Nw >::_M_is_equal().

template<size_t _Nb>
bitset<_Nb> std::bitset< _Nb >::operator>> ( size_t  __position  )  const [inline]

Self-explanatory.

Reimplemented in std::__debug::bitset< _Nb >.

Definition at line 1118 of file bitset.

template<size_t _Nb>
bitset<_Nb>& std::bitset< _Nb >::operator>>= ( size_t  __position  )  [inline]

Operations on bitsets.

Parameters:
position The number of places to shift.
These should be self-explanatory.

Reimplemented in std::__debug::bitset< _Nb >.

Definition at line 837 of file bitset.

References std::_Base_bitset< _Nw >::_M_do_reset(), and std::_Base_bitset< _Nw >::_M_do_right_shift().

template<size_t _Nb>
reference std::bitset< _Nb >::operator[] ( size_t  __position  )  [inline]

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 std::__debug::bitset< _Nb >.

Definition at line 991 of file bitset.

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

template<size_t _Nb>
bitset<_Nb>& std::bitset< _Nb >::operator^= ( const bitset< _Nb > &  __rhs  )  [inline]

Operations on bitsets.

Parameters:
rhs A same-sized bitset.
These should be self-explanatory.

Definition at line 809 of file bitset.

References std::_Base_bitset< _Nw >::_M_do_xor().

template<size_t _Nb>
bitset<_Nb>& std::bitset< _Nb >::operator|= ( const bitset< _Nb > &  __rhs  )  [inline]

Operations on bitsets.

Parameters:
rhs A same-sized bitset.
These should be self-explanatory.

Definition at line 802 of file bitset.

References std::_Base_bitset< _Nw >::_M_do_or().

template<size_t _Nb>
bitset<_Nb> std::bitset< _Nb >::operator~ (  )  const [inline]

See the no-argument flip().

Reimplemented in std::__debug::bitset< _Nb >.

Definition at line 970 of file bitset.

template<size_t _Nb>
bitset<_Nb>& std::bitset< _Nb >::reset ( size_t  __position  )  [inline]

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 std::__debug::bitset< _Nb >.

Definition at line 937 of file bitset.

References __N, and std::bitset< _Nb >::_Unchecked_reset().

template<size_t _Nb>
bitset<_Nb>& std::bitset< _Nb >::reset (  )  [inline]

Sets every bit to false.

Reimplemented in std::__debug::bitset< _Nb >.

Definition at line 923 of file bitset.

References std::_Base_bitset< _Nw >::_M_do_reset().

Referenced by std::bitset< _Nb >::_M_copy_from_string(), and std::__debug::bitset< _Nb >::reset().

template<size_t _Nb>
bitset<_Nb>& std::bitset< _Nb >::set ( size_t  __position,
bool  __val = true 
) [inline]

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 std::__debug::bitset< _Nb >.

Definition at line 912 of file bitset.

References __N, and std::bitset< _Nb >::_Unchecked_set().

template<size_t _Nb>
bitset<_Nb>& std::bitset< _Nb >::set (  )  [inline]

Sets every bit to true.

Reimplemented in std::__debug::bitset< _Nb >.

Definition at line 898 of file bitset.

References std::_Base_bitset< _Nw >::_M_do_set().

Referenced by std::__debug::bitset< _Nb >::set().

template<size_t _Nb>
size_t std::bitset< _Nb >::size (  )  const [inline]

Returns the total number of bits.

Definition at line 1067 of file bitset.

template<size_t _Nb>
bool std::bitset< _Nb >::test ( size_t  __position  )  const [inline]

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 1088 of file bitset.

References __N, and std::bitset< _Nb >::_Unchecked_test().

template<size_t _Nb>
template<class _CharT, class _Traits, class _Alloc>
std::basic_string<_CharT, _Traits, _Alloc> std::bitset< _Nb >::to_string (  )  const [inline]

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).

Reimplemented in std::__debug::bitset< _Nb >, std::__debug::bitset< _Nb >, std::__debug::bitset< _Nb >, and std::__debug::bitset< _Nb >.

Definition at line 1019 of file bitset.

References std::bitset< _Nb >::_M_copy_to_string().

template<size_t _Nb>
unsigned long std::bitset< _Nb >::to_ulong (  )  const [inline]

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 1006 of file bitset.

References std::_Base_bitset< _Nw >::_M_do_to_ulong().


The documentation for this class was generated from the following file:
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