std::bitset::size

From cppreference.com
< cpplrm; | utilitylrm; | bitset
std::size_t size() const;
(until C++11)
constexpr std::size_t size() const noexcept;
(since C++11)

Returns the number of bits that the bitset can hold.

Parameters

(none)

Return value

number of bits that the bitset can hold, i.e. the template parameter N

See also

returns the number of bits set to true
(public member function)