std::bitset<N>::to_ullong

unsigned long long to_ullong() const

constexpr unsigned long long to_ullong() const

Converts the contents of the bitset to an unsigned long long integer.

The first bit of the bitset corresponds to the least significant digit of the number and the last bit corresponds to the most significant digit.

Parameters

(none).

Return value

the converted integer.

Exceptions

std::overflow_error if the value can not be represented in unsigned long long.

Example

#include <iostream>
#include <bitset>
#include <limits>
 
int main()
{
    std::bitset<std::numeric_limits<unsigned long long>::digits> b(
        0x123456789abcdef0LL
    );
 
    std::cout << b << "  " << std::hex << b.to_ullong() << '\n';
    b.flip();
    std::cout << b << "  " << b.to_ullong() << '\n';
}

0001001000110100010101100111100010011010101111001101111011110000  123456789abcdef0
1110110111001011101010011000011101100101010000110010000100001111  edcba9876543210f

See also