std::bitset<N>::size

< cpp‎ | utility‎ | 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 holds.

Parameters

(none)

Return value

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

Example

#include <bitset>
#include <iostream>
 
int main() {
    std::cout << std::bitset<0x400>().size() << '\n';
}

Output:

1024

See also

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