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

public member function

std::bitset::flip all bits (1)

bitset& flip();

single bit (2)

bitset& flip (size_t pos);

all bits (1)

bitset& flip() noexcept;

single bit (2)

bitset& flip (size_t pos);

Flip bits

Flips bit values converting zeros into ones and ones into zeros:

(1) all bits: Flips all bits in the bitset.
(2) single bit: Flips the bit at position pos.

Parameters

pos: Order position of the bit whose value is flipped.
Order positions are counted from the rightmost bit, which is order position 0.
If pos is equal or greater than the bitset size, an out_of_range exception is thrown.
size_t is an unsigned integral type.

Return value*this
Example

// bitset::flip
#include <iostream>       // std::cout
#include <string>         // std::string
#include <bitset>         // std::bitset

int main ()
{
  std::bitset<4> foo (std::string("0001"));

  std::cout << foo.flip(2) << '\n';     // 0101
  std::cout << foo.flip() << '\n';      // 1010

  return 0;
}

Output:

Data races Both the bitset and its bits are modified.

Exception safety For (1): it never throws exceptions (no-throw guarantee).
For (2): in case of exception, the object is in a valid state (basic guarantee).
If pos is equal or greater than the bitset size, the function throws an out_of_range exception.

See also

bitset::set: Set bits (public member function)

bitset::reset: Reset bits (public member function)

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