std::bitset::operator[]

 

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bool operator[]( size_t pos ) const;	(1)
reference operator[]( size_t pos );	(2)

Accesses the bit at position pos. The first version returns the value of the bit, the second version returns an object of type std::bitset::reference that allows modification of the value.

Throws std::out_of_range if pos does not correspond to a valid bit position.

Parameters

pos

-

position of the bit to return

Return value

1) the value of the requested bit

2) an object of type std::bitset::reference with the value of the bit.

Example

#include <iostream>
#include <bitset>
 
int main() 
{
    std::bitset<8> b1(42);
    for (int i = 0; i < b1.size(); ++i) {
        std::cout << "b1[" << i << "]: " << b1[i] << '\n';
    }
    return 0;
}

Output:

b1[0]: 0
b1[1]: 1
b1[2]: 0
b1[3]: 1
b1[4]: 0
b1[5]: 1
b1[6]: 0
b1[7]: 0

See also

test	accesses specific bit (public member function)