What is the comlexity "|" (OR operation ) between two c++ bitset?

Правка en1, от _Muhammad, 2018-07-15 03:45:13 
bitset < n > b1, b2;
b1 |= b2;

Is the complexity of above code O(n)? Or it works in O(1).

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en1 Английский _Muhammad 2018-07-15 03:45:13 175 Initial revision (published)