cppreference.com > C++ Bitsets > Bitset Operators Bitset Operators Syntax:
      #include <bitset>
      !=, ==, &=, ^=, |=, ~, <<=, >>=, []
These operators all work with bitsets. They can be described as follows: != returns true if the two bitsets are not equal. == returns true if the two bitsets are equal. &= performs the AND operation on the two bitsets. ^= performs the XOR operation on the two bitsets. |= performs the OR operation on the two bitsets. ~ reverses the bitset (same as calling flip()) <<= shifts the bitset to the left >>= shifts the bitset to the right [x] returns a reference to the xth bit in the bitset. For example, the following code creates a bitset and shifts it to the left 4 places:
     // create a bitset out of a number
     bitset<8> bs2( (long) 131 );
     cout << "bs2 is " << bs2 << endl;
     // shift the bitset to the left by 4 digits
     bs2 <<= 4;
     cout << "now bs2 is " << bs2 << endl;
When the above code is run, it displays:
     bs2 is 10000011
     now bs2 is 00110000