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Showing content from https://cplusplus.com/reference/vector/vector-bool/flip/ below:

public member function

<vector>

std::vector<bool>::flip

Flip bits

Flips all values in the container: All instances of true become false, and all instances of false become true.

Parameters none

Return value none

Example 
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// vector<bool>::flip
#include <iostream>
#include <vector>

int main ()
{
  std::vector<bool> mask;

  mask.push_back(true);
  mask.push_back(false);
  mask.push_back(false);
  mask.push_back(true);

  mask.flip();

  std::cout << std::boolalpha;
  std::cout << "mask contains:";
  for (unsigned i=0; i<mask.size(); i++)
    std::cout << ' ' << mask.at(i);
  std::cout << '\n';

  return 0;
}

Output: 
mask contains: false true true false


Complexity Linear in size.

Iterator validity No changes.

Data races The container is accessed.
All elements are modified.

Exception safetyNo-throw guarantee: this member function never throws exceptions.

See also
vector<bool>::reference
Reference type (public member class)

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