bitset<N>& set ( );
bitset<N>& set ( size_t pos, bool val = true );

Set bits

The version with no parameters sets (to 1) all the bits in the bitset.
The parameterized version, stores val as the new value for bit at position pos.

Parameters

pos

Order position of the bit whose value is modified.
Order positions are counted from the rightmost bit, which is order position 0.
size_t is an unsigned integral type.

val

Value to store in the bit (either true or false).

Return value

If pos is not a valid bit position, out_of_range is thrown.

Example

// bitset::set
#include <iostream>
#include <bitset>
using namespace std;

int main ()
{
  bitset<4> mybits;

  cout << mybits.set() << endl;       // 1111
  cout << mybits.set(2,0) << endl;    // 1011
  cout << mybits.set(2) << endl;      // 1111

  return 0;
}

See also