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Showing content from https://cplusplus.com/reference/bitset/bitset/ below:

class template

<bitset>

template <size_t N> class bitset;

Bitset

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>).

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.

reference

Reference-like type (public member class)

(constructor)

Construct bitset (public member function)

applicable operators

Bitset operators (function)

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)

set

Set bits (public member function)

reset

Reset bits (public member function)

flip

Flip bits (public member function)

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)

applicable operators

Bitset operators (function)

hash<bitset>

Hash for bitset (class template specialization)

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