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std::bitset<N>::operator&=,|=,^=,~ - cppreference.com

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bitset& operator&=( const bitset& other );

 (1) (noexcept since C++11)
(constexpr since C++23)

bitset& operator|=( const bitset& other );

 (2) (noexcept since C++11)
(constexpr since C++23)

bitset& operator^=( const bitset& other );

 (3) (noexcept since C++11)
(constexpr since C++23)

bitset operator~() const;

 (4) (noexcept since C++11)
(constexpr since C++23)

Performs binary AND, OR, XOR and NOT.

1) Sets the bits to the result of binary AND on corresponding pairs of bits of *this and other.

2) Sets the bits to the result of binary OR on corresponding pairs of bits of *this and other.

3) Sets the bits to the result of binary XOR on corresponding pairs of bits of *this and other.

4) Returns a temporary copy of *this with all bits flipped (binary NOT).

Note that &=, |=, and ^= are only defined for bitsets of the same size N.

Parameters

Return value

1-3) *this

4) std::bitset<N>(*this).flip()

Example

#include <bitset>
#include <cstddef>
#include <iostream>
#include <string>

int main()
{
    const std::string pattern_str{"1001"};
    std::bitset<16> pattern{pattern_str}, dest;
 
    for (std::size_t i = dest.size() / pattern_str.size(); i != 0; --i)
    {
        dest <<= pattern_str.size();
        dest |= pattern;
        std::cout << dest << " (i = " << i << ")\n";
    }

    std::cout << ~dest << " (~dest)\n";
}

Output: 

0000000000001001 (i = 4)
0000000010011001 (i = 3)
0000100110011001 (i = 2)
1001100110011001 (i = 1)
0110011001100110 (~dest)

See also