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A bitset stores bits (elements with only two possible values: 0 or 1,
The class emulates an array of
Each bit position can be accessed individually: for example, for a given bitset named
Bitsets have the feature of being able to be constructed from and converted to both integer values and binary strings (see its constructor and members to_ulong and to_string). They can also be directly inserted and extracted from streams in binary format (see applicable operators).
The size of a bitset is fixed at compile-time (determined by its template parameter). For a class that also optimizes for space allocation and allows for dynamic resizing, see the
Reference
C library:
- <cassert> (assert.h)
- <cctype> (ctype.h)
- <cerrno> (errno.h)
-
<cfenv> (fenv.h)C++11
- <cfloat> (float.h)
-
<cinttypes> (inttypes.h)C++11
- <ciso646> (iso646.h)
- <climits> (limits.h)
- <clocale> (locale.h)
- <cmath> (math.h)
- <csetjmp> (setjmp.h)
- <csignal> (signal.h)
- <cstdarg> (stdarg.h)
-
<cstdbool> (stdbool.h)C++11
- <cstddef> (stddef.h)
-
<cstdint> (stdint.h)C++11
- <cstdio> (stdio.h)
- <cstdlib> (stdlib.h)
- <cstring> (string.h)
-
<ctgmath> (tgmath.h)C++11
- <ctime> (time.h)
-
<cuchar> (uchar.h)C++11
- <cwchar> (wchar.h)
- <cwctype> (wctype.h)
Containers:
-
<array>C++11
- <deque>
-
<forward_list>C++11
- <list>
- <map>
- <queue>
- <set>
- <stack>
-
<unordered_map>C++11
-
<unordered_set>C++11
- <vector>
-
Input/Output:
Multi-threading:
-
<atomic>C++11
-
<condition_variable>C++11
-
<future>C++11
-
<mutex>C++11
-
<thread>C++11
-
Other:
- <algorithm>
- <bitset>
-
<chrono>C++11
-
<codecvt>C++11
- <complex>
- <exception>
- <functional>
-
<initializer_list>C++11
- <iterator>
- <limits>
- <locale>
- <memory>
- <new>
- <numeric>
-
<random>C++11
-
<ratio>C++11
-
<regex>C++11
- <stdexcept>
- <string>
-
<system_error>C++11
-
<tuple>C++11
-
<type_traits>C++11
-
<typeindex>C++11
- <typeinfo>
- <utility>
- <valarray>
bitset
- bitset::bitset
- bitset operators
member classes
member functions
non-member specializations
-
hash<bitset>C++11
-
class template
<bitset>
std::bitset
template <size_t N> class bitset;
Bitset
true or false, ...).The class emulates an array of
bool elements, but optimized for space allocation: generally, each element occupies only one bit (which, on most systems, is eight times less than the smallest elemental type: char).Each bit position can be accessed individually: for example, for a given bitset named
foo, the expression foo[3] accesses its fourth bit, just like a regular array accesses its elements. But because no elemental type is a single bit in most C++ environments, the individual elements are accessed as special references type (see bitset::reference).Bitsets have the feature of being able to be constructed from and converted to both integer values and binary strings (see its constructor and members to_ulong and to_string). They can also be directly inserted and extracted from streams in binary format (see applicable operators).
The size of a bitset is fixed at compile-time (determined by its template parameter). For a class that also optimizes for space allocation and allows for dynamic resizing, see the
bool specialization of vector (vector<bool>).Template parameters
- N
- Size of the bitset, in terms of number of bits.
It is returned by member function bitset::size.
size_t is an unsigned integral type.
Member types
- reference
- Reference-like type (public member class)
Member functions
- (constructor)
- Construct bitset (public member function)
- applicable operators
- Bitset operators (function)
Bit access
- operator[]
- Access bit (public member function)
- count
- Count bits set (public member function)
- size
- Return size (public member function)
- test
- Return bit value (public member function)
- any
- Test if any bit is set (public member function)
- none
- Test if no bit is set (public member function)
- all
- Test if all bits are set (public member function)
Bit operations
- set
- Set bits (public member function)
- reset
- Reset bits (public member function)
- flip
- Flip bits (public member function)
Bitset operations
- to_string
- Convert to string (public member function)
- to_ulong
- Convert to unsigned long integer (public member function)
- to_ullong
- Convert to unsigned long long (public member function)
Non-member function overloads
- applicable operators
- Bitset operators (function)
Non-member class specializations
- hash<bitset>
- Hash for bitset (class template specialization)
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Spotted an error? contact us